SAKAI Masami 酒井政美

… Alternative Names

Researcher Number	60215598
Other IDs
Affiliation (Current)	2019: 神奈川大学, 理学部, 教授
Affiliation (based on the past Project Information) *help	2012 – 2018: 神奈川大学, 理学部, 教授 2007 – 2011: Kanagawa University, 工学部, 教授 2002 – 2005: 神奈川大学, 工学部, 教授 1999: Kanagawa University, Faculty of engineering, Professor, 工学部, 教授 1998: 神奈川大学, 工学部, 助教授 1996: 神奈川大学, 工学部, 助教授 1994: 神奈川大学, 工学部, 助教授
Review Section/Research Field	Principal Investigator General mathematics (including Probability theory/Statistical mathematics) / Foundations of mathematics/Applied mathematics Except Principal Investigator Geometry / Algebra / General mathematics (including Probability theory/Statistical mathematics) / Statistical science / General mathematics (including Probability theory/Statistical mathematics) / Geometry
Keywords	Principal Investigator 数学基礎論 / 関数空間 / Scheepers予想 / Pixley-Roy / 特異部分集合 / 臨界濃度 / selective separability / cardinal function / Pixley-Roy Hyperspace / the discrete countable chain condition … More Except Principal Investigator 積空間 / 被覆性 / 正規性 / 順序数 / normality / covering property / 代数曲線 / Weierstrass点 / gap列 / Weierstrass半群 / Weirstrass Pair / 代数曲線符号 / 位相空間論 / 集合論 / 位相的性質 / 特異摂動 / 確率微分方程式 / リエナ-ル方程式 / 中心極限定理 / オルンシェタイン=ウーレンベック過程 / 急速変数 / 遅変数 / 大偏差原理 / 待ち行列 / ネットワーク / 拡散過程近似 / 確率解析 / 確率積分 / 多次元Skorohod方程式 / 跳躍過程 / マルチンゲ-ル理論 / 数学基礎論 / エレメンタリーサブモデル / 位相空間 / ZFC / 位相積空間 / レギュラーネット / 距離化定理 / k-ネットワーク / 関数空間 / 擬軌道尾行性 / LF-netted空間 / メタコンパクト / サブパラコンパクト / Special refinement / topological product / regular net / metrization theorem / k-network / function space / shadowing property / 位相群 / 自由位相群 / k-空間 / 商写像 / 距離空間 / タイトネス / 自由可換位相群 / 位相構造 / 実数値関数 / 連続関数 / 一様連続関数 / ストレート空間 / Topological group / Free topological group / k-space / Quotient mapping / Metric space / Tightness / M_3空間 / 正規被覆 / 無限積空間 / Σ-積空間 / M_3-空間 / M_1-空間 / 有限積空間 / 長方形の組分 / ベースパラコンパクト / 長方形 / パラコンパクト / rectangular / M_3-space / normal cover / product / infinite product / Σ-product / ordinal Less

実数の特異部分集合と関数空間の局所的性質に関するScheepers予想の総合研究Principal InvestigatorOngoing
- Principal Investigator
  
  酒井政美
- Project Period (FY)
  2017 – 2021
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Foundations of mathematics/Applied mathematics
- Research Institution
  Kanagawa University
Applications of Pixley-Roy hyperspaces to Scheepers' conjecture on special subsets of realsPrincipal Investigator
- Principal Investigator
  
  SAKAI MASAMI
- Project Period (FY)
  2013 – 2016
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Foundations of mathematics/Applied mathematics
- Research Institution
  Kanagawa University
A study on Scheepers' conjecture of special subsets of reals in view of a sequence of upper semi-continuous functionsPrincipal Investigator
- Principal Investigator
  
  SAKAI Masami
- Project Period (FY)
  2010 – 2012
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  General mathematics (including Probability theory/Statistical mathematics)
- Research Institution
  Kanagawa University
The study for covering properties of topological spaces and their products in terms of elementary submodels
- Principal Investigator
  
  YAJIMA Yukinobu
- Project Period (FY)
  2009 – 2011
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  General mathematics (including Probability theory/Statistical mathematics)
- Research Institution
  Kanagawa University
A study on special subsets of real numbers derived from local properties of function spaces and their critical cardinalitiesPrincipal Investigator
- Principal Investigator
  
  SAKAI Masami
- Project Period (FY)
  2007 – 2009
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  General mathematics (including Probability theory/Statistical mathematics)
- Research Institution
  Kanagawa University
The considerations of M_3 problems from a new point of view
- Principal Investigator
  
  YAJIMA Yukinobu
- Project Period (FY)
  2003 – 2005
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Geometry
- Research Institution
  Kanagawa University
Research of dimension and topological structures of topological groups
- Principal Investigator
  
  YAMADA Kohzo
- Project Period (FY)
  2002 – 2003
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Geometry
- Research Institution
  Shizuoka University
NORMALITY AND COVERING PROFERITIES OF TOPOLOGICAL PROCUCT SPACES
- Principal Investigator
  
  YAJIMA Yukinobu
- Project Period (FY)
  1998 – 1999
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Geometry
- Research Institution
  Kanagawa University
待ち行列ネットワークの拡散過程近似とその応用
- Principal Investigator
  
  山田敬吾
- Project Period (FY)
  1996
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Statistical science
- Research Institution
  Kanagawa University
有限体上の代数曲線論のcoding theoryへの応用
- Principal Investigator
  
  本間正明
- Project Period (FY)
  1994
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  Algebra
- Research Institution
  Kanagawa University
位相積空間の多面的考察
- Principal Investigator
  
  YAJIMA Yukinobu
- Project Period (FY)
  1994
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  Geometry
- Research Institution
  Kanagawa University
特異摂動の入った確率微分方程式系における急速変数と引き込み現象の解析
- Principal Investigator
  
  成田清正
- Project Period (FY)
  1994
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  General mathematics (including Probability theory/Statistical mathematics)
- Research Institution
  Kanagawa University

[Book] The combinatrics of open covers2014
- Author(s)
  Masami Sakai, Marion Scheepers
- Total Pages
  51
- Publisher
  Atlantis Press
- Data Source
  KAKENHI-PROJECT-25400213
[Journal Article] A monotonically retractable realcompact space which is not Lindelof2018
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology Proceedings
  
  Volume: 52
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17K05352
[Journal Article] Point-countable covers and sequence-covering maps2018
- Author(s)
  F. Lin, S. Lin and Masami Sakai
- Journal Title
  
  Houston Journal Mathematics
  
  Volume: 44
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05352
[Journal Article] Remarks on monotone (weak) Lindelofness2017
- Author(s)
  M. Bonanzinga, F. Cammaroto and Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 印刷中
- Peer Reviewed / Acknowledgement Compliant / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25400213
[Journal Article] On selective absolute star-Lindelofness2017
- Author(s)
  M. Bonanzinga, M. Cuzzupe and Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 221
- DOI
  10.1016/j.topol.2017.02.006
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05352
[Journal Article] Remarks on monotone (weak) Lindelofness2017
- Author(s)
  M. Bonanzinga, F. Cammaroto and Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 225
- DOI
  10.1016/j.topol.2017.04.009
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05352
[Journal Article] The projectively Menger property and an embedding of Sw into function spaces2017
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 220
- DOI
  10.1016/j.topol.2017.02.017
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17K05352
[Journal Article] On selective absolute star-Lindelofness2017
- Author(s)
  M. Bonanzinga, M. Cuzzupe and Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 221
- Peer Reviewed / Acknowledgement Compliant / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25400213
[Journal Article] Compactifications of a Pixley-Roy hyperspace2015
- Author(s)
  Angelo Bella and Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 196 Pages: 173-182
- DOI
  10.1016/j.topol.2015.09.041
- Peer Reviewed / Acknowledgement Compliant / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25400213
[Journal Article] Star versions of the Menger property2014
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 176
- DOI
  10.1016/j.topol.2014.07.006
- Peer Reviewed / Acknowledgement Compliant
- Data Source
  KAKENHI-PROJECT-25400213
[Journal Article] Some weak covering properties and infinite games2014
- Author(s)
  Masami Sakai
- Journal Title
  
  Central European Journal of Mathematics
  
  Volume: 12
- DOI
  10.2478/s11533-013-0343-4
- Peer Reviewed / Acknowledgement Compliant
- Data Source
  KAKENHI-PROJECT-25400213
[Journal Article] Quotient maps onto submaximal spaces2014
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 164
- DOI
  10.1016/j.topol.2014.01.010
- Peer Reviewed / Acknowledgement Compliant
- Data Source
  KAKENHI-PROJECT-25400213
[Journal Article] Tight points of Pixley-Roy hyperspaces2013
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 160 Pages: 2061-2068
- DOI
  10.1016/j.topol.2013.08.009
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-25400213
[Journal Article] The weak Hurewicz property of Pixley-Roy hyperspaces2013
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and its Applications
  
  Volume: 160 Pages: 2531-2537
- DOI
  10.1016/j.topol.2013.07.047
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-25400213
[Journal Article] Selective separability of Pixley-Roy hyperspaces2012
- Author(s)
  M. Sakai
- Journal Title
  
  Topology Appl.
  
  Volume: 159 Pages: 1591-1598
- DOI
  10.1016/j.topol.2011.03.017
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22540154
[Journal Article] The Frechet-Urysohn property of Pixley-Roy hyperspaces2012
- Author(s)
  M. Sakai
- Journal Title
  
  Topology Appl.
  
  Volume: 159 Pages: 308-314
- DOI
  10.1016/j.topol.2011.08.027
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22540154
[Journal Article] Cardinal functions of Pixley-Roy hyperspaces2012
- Author(s)
  M. Sakai
- Journal Title
  
  Topology Appl.
  
  Volume: 159 Pages: 3080-3088
- DOI
  10.1016/j.topol.2012.05.020
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22540154
[Journal Article] The Frechet-Urysohn property of Pixley-Roy hyperspaces2012
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and Appl
  
  Volume: 159 Pages: 308-314
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21540149
[Journal Article] Selective separability and its variations2011
- Author(s)
  Gary Gruenhage and Masami Sakai
- Journal Title
  
  Topology and Appl
  
  Volume: 158 Pages: 1352-1359
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21540149
[Journal Article] Selective separability and its variations2011
- Author(s)
  M. Sakai, G. Gruenhage
- Journal Title
  
  Topology Appl
  
  Volume: 158 Pages: 1352-1359
- DOI
  10.1016/j.topol.2011.05.009
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22540154
[Journal Article] On k-networks and weak bases for spaces2010
- Author(s)
  酒井政美
- Journal Title
  
  Topology and its Applications
  
  Volume: 157 Pages: 2383-2388
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22540154
[Journal Article] Mizokami and Lin's conjecture onσ-CF pseudo-bases2010
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and Appl
  
  Volume: 157 Pages: 152-156
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21540149
[Journal Article] On k-networks and weak bases for spaces2010
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and Appl
  
  Volume: 157 Pages: 2383-2388
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21540149
[Journal Article] conjecture onσ-CF* pseudo-bases2010
- Author(s)
  M. Sakai, Mizokami, Lin's
- Journal Title
  
  Topology Appl. 157
  
  Pages: 152-156
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Mizokami and Lin's conjecture on σ-CF^* pseudo-base2010
- Author(s)
  酒井政美
- Journal Title
  
  Topology and its Applications
  
  Volume: 157 Pages: 152-156
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22540154
[Journal Article] The Ramsey property for Cp(X)2010
- Author(s)
  酒井政美
- Journal Title
  
  Acta Math.Hungar.
  
  Volume: 128 Pages: 96-105
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22540154
[Journal Article] The Ramsey property for Cp(X)2010
- Author(s)
  Masami Sakai
- Journal Title
  
  Acta Math. Hungar
  
  Volume: 128 Pages: 96-105
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21540149
[Journal Article] On k-networks and weak base for spaces2010
- Author(s)
  M. Sakai
- Journal Title
  
  Topology Appl.
  
  Volume: 157 Pages: 2383-2388
- DOI
  10.1016/j.topol.2010.07.009
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22540154
[Journal Article] Sequences of semicontinuous functions accompanying continuous functions2009
- Author(s)
  酒井政美・大田春外
- Journal Title
  
  Topology and its Applications 156
  
  Pages: 2683-2691
- NAID
  120001662293
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Selection principles and upper semicontinuous functions2009
- Author(s)
  Masami Sakai
- Journal Title
  
  Colloq. Math
  
  Volume: 117 Pages: 251-256
- Data Source
  KAKENHI-PROJECT-21540149
[Journal Article] Sequences of semicontinuous functions accompanying continuous functions2009
- Author(s)
  M. Sakai, H. Ohta
- Journal Title
  
  Topology Appl. 156
  
  Pages: 2683-2691
- NAID
  120001662293
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Sequences of semicontinuous functions accompanying continuous functions2009
- Author(s)
  Haruto Ohta and Masami Sakai
- Journal Title
  
  Topology and Appl
  
  Volume: 156 Pages: 2683-2691
- NAID
  120001662293
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21540149
[Journal Article] Menger subsets of the Sorgenfrey line2009
- Author(s)
  M. Sakai
- Journal Title
  
  Proc. Amer. Math. Soc. 137
  
  Pages: 3129-3138
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Menger subsets of the Sorgenfrey line2009
- Author(s)
  Masami Sakai
- Journal Title
  
  Proc. Amer. Math. Soc
  
  Volume: 137 Pages: 3129-3138
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21540149
[Journal Article] Menger subsets of the Sorgenfrey line2009
- Author(s)
  酒井政美
- Journal Title
  
  Proceedings Amer.Math.Soc. 137
  
  Pages: 3129-3138
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Selection principles and upper semicontinuous functions2009
- Author(s)
  M. Sakai
- Journal Title
  
  Colloquium Math 117
  
  Pages: 251-256
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Selection principles and upper semicontinuous functions2009
- Author(s)
  酒井政美
- Journal Title
  
  Colloquium Mathematicum 117
  
  Pages: 251-256
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Mapping theorems onχ-spaces2008
- Author(s)
  M. Sakai
- Journal Title
  
  Comm. Math. Univ. Calolinae 49
  
  Pages: 163-167
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Function spaces with a countable cs*-ne twork at a point2008
- Author(s)
  酒井政美
- Journal Title
  
  Topology and its Applications 156
  
  Pages: 117-123
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Function spaces with a countable cs*-network at a point2008
- Author(s)
  M. Sakai
- Journal Title
  
  Topology Appl. 156
  
  Pages: 117-123
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Mapping theorems on Aleph-spaces2008
- Author(s)
  酒井政美
- Journal Title
  
  Comment at iones Math. Univ. Carolinae 49
  
  Pages: 163-167
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Weak open maps and sequence-covering maps2007
- Author(s)
  酒井政美
- Journal Title
  
  Scientiae Mathematicae Japonicae 66
  
  Pages: 67-71
- NAID
  10019758561
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] The sequence selection properties of Cp(X)2007
- Author(s)
  酒井政美
- Journal Title
  
  Topology and its Applications 154
  
  Pages: 552-560
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Counterexamples on the images of locally separable metric spaces2007
- Author(s)
  酒井政美, Shou Lin
- Journal Title
  
  Topology Proceedings 31
  
  Pages: 181-187
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] k-Frechet Urysohn property of Ck(X)2007
- Author(s)
  酒井政美
- Journal Title
  
  Topology and its Applications 154
  
  Pages: 1516-1520
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] On dense subspaces of Cp(X)2007
- Author(s)
  酒井政美
- Journal Title
  
  Note di Matematica 27
  
  Pages: 41-46
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] The sequence selection properties of Cp (X)2007
- Author(s)
  M. Sakai
- Journal Title
  
  Topology Appl. 154
  
  Pages: 552-560
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Weak-open maps and sequence-covering maps2007
- Author(s)
  M. Sakai
- Journal Title
  
  Sci. Math. Japonicae 66
  
  Pages: 67-71
- NAID
  10019758561
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] k-Frechet Urysohn property of Ck (X)2007
- Author(s)
  M. Sakai
- Journal Title
  
  Topology Appl. 154
  
  Pages: 516-1520
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] The Pytkeev property and Reznichenko property in function spaces2004
- Author(s)
  酒井政美
- Journal Title
  
  Note de Matematicae 22
  
  Pages: 43-52
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] The Dytkeev property and the Rezmichenko property in function spaces2004
- Author(s)
  酒井政美
- Journal Title
  
  Note di Matematica 22
  
  Pages: 43-52
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] Free topological groups over ω_μ-metrizable spaces2004
- Author(s)
  S.Garcia-Ferreira, 酒井政美, M.Sanchis
- Journal Title
  
  Houston Journal of Mathematics 30
  
  Pages: 1039-1053
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] Subparacompactness and subinetacompasteness of a products2003
- Author(s)
  酒井政美
- Journal Title
  
  Topology and its Applications 129
  
  Pages: 153-158
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] The Pytkeev property and the Reznichenko property in function spaces2003
- Author(s)
  Masami Sakai
- Journal Title
  
  Note di Mathematica 22
  
  Pages: 43-52
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] Subparacompactness and submetacompactness of σ-products2003
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and its Applications 129
  
  Pages: 153-158
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] χ-Frechet Urysohn property in C_k(χ)
- Author(s)
  酒井政美
- Journal Title
  
  Topology and its Applications
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] The Ramsey property for Cp (X)
- Author(s)
  M. Sakai
- Journal Title
  
  to appear in Acta Math. Hungur.
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19540151
[Journal Article] Counterexamples on generalized metric spaces
- Author(s)
  酒井政美
- Journal Title
  
  Sci. Math. Japonicae
- NAID
  10019279547
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] Two properties of C_p(X) weaker than the Frechet Urysohn property
- Author(s)
  酒井政美
- Journal Title
  
  Topology and its Applications
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] Two properties of C_p(X) weaker than the Frechet Urysohn property
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and its Applications (to appear)
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] Counterexamples on generalized metric spaces
- Author(s)
  Masami Sakai
- Journal Title
  
  Sci.Math.Japonicae (to appear)
- NAID
  10019279547
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Journal Article] κ-Frechet Urysohn property in C_κ(X)
- Author(s)
  Masami Sakai
- Journal Title
  
  Topology and its Applications (to appear)
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-15540098
[Presentation] The Menger property of Cp(X,2) and related matters2018
- Author(s)
  Masami Sakai
- Organizer
  International conference ``Topological Algebra and Set-Theoretic Topology"
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05352
[Presentation] On monotonically retractable spaces2017
- Author(s)
  酒井政美
- Organizer
  一般位相幾何及び幾何学的トポロジーの現状と諸問題（京都大学数理解析研究所）
- Data Source
  KAKENHI-PROJECT-17K05352
[Presentation] The Menger property of Cp(X,2)2017
- Author(s)
  Masami Sakai
- Organizer
  The 7-th workshop on topology in Zhanzhou, China
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05352
[Presentation] Remarks on the Menger property of Cp(X,2)2017
- Author(s)
  Masami Sakai
- Organizer
  Frontiers of selection principles, Warsaw, Poland
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05352
[Presentation] Monotonically Lindelof spaces, a survey and recent results I, II2016
- Author(s)
  Masami Sakai
- Organizer
  The 6-th workshop on topology in Zhanzhou
- Place of Presentation
  Minnan Normal University
- Year and Date
  2016-08-02
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25400213
[Presentation] Compactifications of Pixley-Roy hyperspaces2015
- Author(s)
  Angelo Bella and Masami Sakai
- Organizer
  International Conference on Set-Theoretic Topology and its Applications
- Place of Presentation
  神奈川大学
- Year and Date
  2015-08-26
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25400213
[Presentation] Notes on strongly Whyburn spaces2014
- Author(s)
  Masami Sakai
- Organizer
  2014 International Conference of Honam Mathematical Society
- Place of Presentation
  Chosun University, Korea
- Year and Date
  2014-06-27
- Invited
- Data Source
  KAKENHI-PROJECT-25400213
[Presentation] Tight pointｓ of a Pixley-Roy hyperspace2013
- Author(s)
  Masami Sakai
- Organizer
  International Conference on Topology and Geometry 2013 joint with the Sixth Japan-Mexico Topology Symposium
- Place of Presentation
  島根大学
- Invited
- Data Source
  KAKENHI-PROJECT-25400213
[Presentation] 一般位相幾何及び幾何学的トポロジーの現状と諸問題2012
- Author(s)
  酒井政美
- Organizer
  Remaks on some covering properties
- Place of Presentation
  京都大学数理解析研究所
- Year and Date
  2012-09-25
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] The weak Hurewicz property of Pixley-Roy hyperspaces,IV Workshop on Coverings2012
- Author(s)
  酒井政美
- Organizer
  Selections and Games in Topology
- Place of Presentation
  ナポリ第2大学, イタリア.
- Year and Date
  2012-06-27
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] The Frechet-Urysohn property of Pixley-Roy hyperspaces2012
- Author(s)
  酒井政美
- Organizer
  第47回位相空間論シンポジウム
- Place of Presentation
  愛媛大学
- Year and Date
  2012-06-03
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] DCCC of Pixley-Roy hyperspaces2012
- Author(s)
  酒井政美
- Organizer
  46-th Spring Topology and Dynamics Conference
- Place of Presentation
  Mexico City, メキシコ.
- Year and Date
  2012-03-22
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] DCCC of Pixley-Roy hyperspaces2012
- Author(s)
  Masami Sakai
- Organizer
  46th Spring Topology and Dynamics Conference
- Place of Presentation
  Mexico City(Mexico)
- Year and Date
  2012-03-22
- Data Source
  KAKENHI-PROJECT-21540149
[Presentation] Cardinal functions of Pixley-Roy hyperspaces2011
- Author(s)
  酒井政美
- Organizer
  General Topology Symposium
- Place of Presentation
  埼玉大学
- Year and Date
  2011-12-20
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] Selective separability of Pixley-Roy hyperspaces2011
- Author(s)
  Masami Sakai
- Organizer
  11th Prague Topological Symposium
- Place of Presentation
  Prague(Czech Republic)
- Year and Date
  2011-08-09
- Data Source
  KAKENHI-PROJECT-21540149
[Presentation] Cardinal functions of Pixley-Roy hyperspaces2011
- Author(s)
  酒井政美
- Organizer
  General Topologyシンポジウム
- Place of Presentation
  埼玉大学教育学部
- Year and Date
  2011-12-19
- Data Source
  KAKENHI-PROJECT-21540149
[Presentation] Selective separability of Pixley-Roy hyperspaces2011
- Author(s)
  酒井政美
- Organizer
  11-th Prague Topological Symposium
- Place of Presentation
  Prague Czech Republic, チェコ.
- Year and Date
  2011-08-09
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] Scheeper's conjecture and upper semicontinuous functions2010
- Author(s)
  酒井政美
- Organizer
  第44回位相空間論シンポジウム
- Place of Presentation
  島根大学
- Year and Date
  2010-05-31
- Data Source
  KAKENHI-PROJECT-21540149
[Presentation] A characterization for βX to be scattered2010
- Author(s)
  酒井政美
- Organizer
  第45回位相空間論シンポジウム
- Place of Presentation
  大阪府立大学
- Year and Date
  2010-06-04
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] A characterization for βX to be scattered2010
- Author(s)
  酒井政美
- Organizer
  第45回位相空間論シンポジウム
- Place of Presentation
  大阪府立大学
- Year and Date
  2010-06-04
- Data Source
  KAKENHI-PROJECT-21540149
[Presentation] Selective separabilityとその未解決問題について2010
- Author(s)
  酒井政美
- Organizer
  General Topologyシンポジウム
- Place of Presentation
  筑波大学
- Year and Date
  2010-12-22
- Data Source
  KAKENHI-PROJECT-21540149
[Presentation] Selective separability and its variations2010
- Author(s)
  酒井政美
- Organizer
  Analysis, Topology and Applicatins 2010
- Place of Presentation
  Vrnjacka Banja, Serbia(招待講演)
- Year and Date
  2010-06-22
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] Selective separability とその未解決問題2010
- Author(s)
  酒井政美
- Organizer
  General Topology Symposium
- Place of Presentation
  筑波大学
- Year and Date
  2010-12-20
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] Selective separability and its variations2010
- Author(s)
  Masami Sakai
- Organizer
  Analysis, Topology and Applications 2010
- Place of Presentation
  Vrnjacka Banja,(Serbia)
- Year and Date
  2010-06-22
- Data Source
  KAKENHI-PROJECT-21540149
[Presentation] Selective separability and its variations, Analysis2010
- Author(s)
  酒井政美
- Organizer
  Topology and Applicatins 2010
- Place of Presentation
  Vrnjacka Banja, セルビア
- Year and Date
  2010-06-22
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] Menger subsets of the Sorgenfrey line2009
- Author(s)
  酒井政美
- Organizer
  24th Summer Conference on Topology and its Applications
- Place of Presentation
  Brno, Czech Republic
- Data Source
  KAKENHI-PROJECT-19540151
[Presentation] The Ramsey property forCp(X)2009
- Author(s)
  酒井政美
- Organizer
  一般位相幾何学及び幾何学的トポロジーに関する研究集会
- Place of Presentation
  京都大学数理解析研究所
- Year and Date
  2009-10-15
- Data Source
  KAKENHI-PROJECT-21540149
[Presentation] The Ramsey property for Cp (X)2009
- Author(s)
  酒井政美
- Organizer
  一般位相幾何及び幾何学的トポロジーに関する研究
- Place of Presentation
  京都大学数理解析研究所
- Data Source
  KAKENHI-PROJECT-19540151
[Presentation] Menger subsets of the Sorgenfrey line2009
- Author(s)
  Masami Sakai
- Organizer
  24th Summer Conference on Topology and its Applications
- Place of Presentation
  Czech Republic
- Data Source
  KAKENHI-PROJECT-21540149
[Presentation] Totally paracompact spaces and remaining problems2008
- Author(s)
  酒井政美
- Organizer
  General Topology Symposium
- Place of Presentation
  高崎経済大学
- Data Source
  KAKENHI-PROJECT-19540151
[Presentation] Mizokami and Lin's conjecture, Advances in Set-theoretic Topology2008
- Author(s)
  酒井政美
- Organizer
  International Centre for Scientific Culture "E. Majorana" School of Mathematics "G. Stampacchia
- Place of Presentation
  Italy
- Data Source
  KAKENHI-PROJECT-19540151
[Presentation] Mizokami and Lin's conjecture2008
- Author(s)
  酒井政美
- Organizer
  Advances in Set-theoretic Topology
- Place of Presentation
  Internat ional Centre for Scient ific Culture, イタリア
- Data Source
  KAKENHI-PROJECT-19540151
[Presentation] Function spaces with a countable cs^*-network at a point2007
- Author(s)
  酒井政美
- Organizer
  International Conference on Topology and its Applications 2007 at Kyoto
- Place of Presentation
  京都大学
- Data Source
  KAKENHI-PROJECT-19540151
[Presentation] Around the strong Pytkeev property of function spaces2007
- Author(s)
  酒井政美
- Organizer
  III Workshop on Coverings, Selections and Games in Topology
- Place of Presentation
  Vrnjacka Banja, Serbia.
- Data Source
  KAKENHI-PROJECT-19540151
[Presentation] Around the strong Pytkeev property of function spaces2007
- Author(s)
  酒井政美
- Organizer
  III Workshop on Coverings, Selections and Games in Topology
- Place of Presentation
  Vrnjacka Banja, Serbia
- Data Source
  KAKENHI-PROJECT-19540151
[Presentation] Function spaces with a countable cs*-network at a point2007
- Author(s)
  酒井政美
- Organizer
  International Conference on Topology and its Applications 2007 at Kyoto
- Place of Presentation
  京都大学
- Data Source
  KAKENHI-PROJECT-19540151
[Presentation] The weak Hurewicz property of Pixley-Roy hyperspaces
- Author(s)
  酒井　政美
- Organizer
  IV Workshop on Coverings, Selections and Games in Topology
- Place of Presentation
  ナポリ第２大学(イタリア)
- Invited
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] Remaks on some covering properties
- Author(s)
  酒井　政美
- Organizer
  一般位相幾何および幾何学的トポロジーの現状と諸問題
- Place of Presentation
  京都大学数理解析研究所
- Data Source
  KAKENHI-PROJECT-22540154
[Presentation] The Frechet-Urysohn property of Pixley-Roy hyperspaces
- Author(s)
  酒井　政美
- Organizer
  第４７回位相空間論シンポジウム
- Place of Presentation
  愛媛大学
- Data Source
  KAKENHI-PROJECT-22540154

1. YAJIMA Yukinobu (10142548)

# of Collaborated Projects: 6 results

# of Collaborated Products: 0 results
2. SAKAI Kazuhiro (30205702)

# of Collaborated Projects: 5 results

# of Collaborated Products: 0 results
3. 阿部吉弘 (10159452)

# of Collaborated Projects: 4 results

# of Collaborated Products: 0 results
4. OHTA Haruto (40126769)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
5. 立花俊一 (50017159)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
6. KEMOTO Nobuyuki (70161825)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
7. 成田清正 (10211450)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
8. HIRATA Yasushi (70375400)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
9. KADA Masaru (00312447)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
10. YAMADA Kohzo (00200717)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
11. SHAKHMATOV Dmitri (90253294)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
12. MIYATA Yoshimasa (50022207)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
13. 本間正明 (80145523)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
14. 山田敬吾 (90111369)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
15. 信太正之 (20271364)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
16. 信田正之

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results

SAKAI Masami 酒井 政美

酒井 政美 サカイ マサミ

Research Projects

Research Products

Co-Researchers

実数の特異部分集合と関数空間の局所的性質に関するScheepers予想の総合研究Principal InvestigatorOngoing

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Applications of Pixley-Roy hyperspaces to Scheepers' conjecture on special subsets of realsPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

A study on Scheepers' conjecture of special subsets of reals in view of a sequence of upper semi-continuous functionsPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

A study on special subsets of real numbers derived from local properties of function spaces and their critical cardinalitiesPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

[Book] The combinatrics of open covers2014

Author(s)

Total Pages

Publisher

Data Source

[Journal Article] A monotonically retractable realcompact space which is not Lindelof2018

Author(s)

Journal Title

Data Source

[Journal Article] Point-countable covers and sequence-covering maps2018

Author(s)

SAKAI Masami 酒井政美

酒井政美サカイマサミ