Rchr
J-GLOBAL ID：200901058863917081
Update date: Jan. 30, 2024
Yasushi Hirata
Yasushi Hirata
Affiliation and department：
Job title：
Associate Professor
Research field (2)：
Applied mathematics and statistics
, Basic mathematics
Research keywords (2)：
topological properties of products of ordinals
, 順序数の積の位相的性質
Research theme for competitive and other funds (4)：
- 2019 - 2022 Study of C*-, C-, P-embeddings in products of monotonically normal spaces
- 2012 - 2015 The set-theoretic study for the products with a monotonical normal factor in terms of stationary sets
- 2009 - 2011 The study for covering properties of topological spaces and their products in terms of elementary submodels
- 2008 - 2010 Infinite combinatorial principles and compact cardinals
Papers (24)：
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Yasushi Hirata, Yukinobu Yajima. Undecidability for the extent of products of a monotonically normal space and a special factor. Topology Appl. 2022. 315. 108157
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Yasushi Hirata, Yukinobu Yajima. Inequality and equality for the extent of products with a special factor. Topology Proc. 2022. 59. 223-241
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Yasushi Hirata, Toshimichi Usuba, Yukinobu Yajima. Equalities for the extent of infinite products and Σ-products. Topology Appl. 2022. 307. 107946
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Yasushi Hirata, Yukinobu Yajima. Undecidability of the cardinality of C*-embedded discrete subsets in products of natural numbers. Topology Proc. 2020. 56. 85-95
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Yasushi Hirata, Nobuyuki Kemoto. The weight of lexicographic products. Topology Appl. 2020. 284. 107357
ｍore...
MISC (3)：
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平田 康史. オーソコンパクトと$\Delta$-パラコンパクトの間 (集合論的・幾何学的トポロジーと種々の分野の交流). 数理解析研究所講究録. 2015. 1932. 12-20
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平田 康史. point-countable baseをもつ空間におけるextentのsup=max問題 (集合論的及び幾何学的トポロジーの現状とその展望). 数理解析研究所講究録. 2014. 1884. 1-6
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平田 康史, 家本 宣幸, 矢島 幸信. 単調正規空間と順序数の部分空間の積 (一般及び幾何学的トポロジーとその応用). 数理解析研究所講究録. 2012. 1781. 76-96
Works (37)：
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C<SUP>*</SUP>- and P-embeddings in z-neighborhood-sublinear spaces
2022 -
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Undecidability for the extent of products of monotonically normal spaces
2022 -
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On the extent of products of monotonically normal spaces
2021 -
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On the extent of products of a monotonically normal space with a special factor
2021 -
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On C*-, C-, P-embeddings and weakly normal ultrafilters
2018 -
ｍore...
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