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幾何学<span class="x_ContentPasted0 ContentPasted0" style="font-family:Helvetica, serif, EmojiFont;margin:0px">ML</span>の皆様</p>
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(クロスポスト失礼いたします)</p>
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直前のお知らせとなり申し訳ありませんが,香川大学では,次の予定で香川セミナーを開催いたします.</p>
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もし興味を持たれた方がいらっしゃいましたら,お気軽にご参加ください.</p>
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香川大学教育学部数学教室</p>
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四ッ谷直仁</p>
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———————————————————————</p>
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《日時》2023年4月7日 13:30-15:00</p>
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《形式》対面</p>
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《場所》香川大学教育学部8号館: 2F L-822 教室</p>
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<span class="x_ContentPasted0 ContentPasted0" style="font-family:"PingFang SC", serif, EmojiFont;margin:0px">《講演者》</span><span class="x_ContentPasted0 ContentPasted0" style="margin:0px">Grigory Solomadin (</span><span class="x_ContentPasted0 ContentPasted0" style="font-family:"PingFang SC", serif, EmojiFont;margin:0px">岡山理科大学</span><span class="x_ContentPasted0 ContentPasted0" style="margin:0px">)</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="font-family:"PingFang SC", serif, EmojiFont;margin:0px">《タイトル》</span><span class="x_ContentPasted0 ContentPasted0" style="margin:0px">Finite topologies and cohomology of sheaves. (English)</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="margin:0px">《アブストラクト》</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="margin:0px">Complex-analytical or algebraic sheaves and their cohomology provide indispensable tool in complex and algebraic geometry (by Godement, Iversen, Hartshorne etc.).</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="margin:0px">This tremendous theory has a "junior brother": sheaves over finite topological spaces.</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="margin:0px">Applications of finite topological spaces (called Alexandrov topologies) have obvious limitations such as possessing only weak homotopy equivalences for CW-complexes.</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="margin:0px">However, the sheaf theory over finite posets inherits most of the tools from its "senior brother" in a very accessible form.</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="margin:0px">Mainstream algebraic topology and finite spaces are connected via combinatorics of finite spaces by theorems of McCord and Stong.</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="margin:0px">Cohomology of sheaves over finite spaces a useful tool in topological data analysis advocated by M.Curry and others.</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="margin:0px">The present talk is a brief introduction to basic theory of sheaves over posets, their cohomology and finite topologies.</span></p>
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<span class="x_ContentPasted0 ContentPasted0" style="margin:0px">Some research problems will be discussed if time permits.</span></p>
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