皆さまこんにちは。愛媛の藤田です。 先日ご連絡いたしました第19回松山TGSAセミナーの 予定が更新されましたのでご連絡いたします。
藤田博司 [email protected]
-------- Forwarded Message -------- Subject: 3月2日の TGSAセミナーの追加講演 Date: Fri, 26 Feb 2016 04:59:36 +0000 From: Dmitri SHAKHMATOV [email protected] To: [email protected] CC: [email protected]
皆様、
3月2日(水)に行のわれる「Matsuyama Seminar on Topology, Geometry, Set Theory and theirApplications」(松山TGSAセミナー)の講演の追加が ありましたのでご連絡差し上げます。
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第19回のセミナー
日時: 2016年3月2日(水) 15:15〜17:30
場所: 愛媛大学理学部2号館2階,大演習室 (201号室)
講演者 1: 渕野 昌 (神戸大学)
時間: 15:15〜16:15
題目: Reflection numbers under large continuum
Abstract: The reflection number $\kappa$ of the Rado Conjecture is defined as the smallest cardinal $\kappa$ such that any non special tree $T$ has a non special subtree $T'$ of cardinality $<\kappa$ (or $\infty$ if there is no such $\kappa$). We show the consistency of the statement that the continuum is fairly large (e.g. that it is a large cardinal like supercompact in an inner model with the same cardinals as in the universe) while the reflection number of the Rado Conjecture is less than or equal to the continuum. We also consider some other reflection numbers and the relationship between them.
講演者 2: Alejandro Dorantes-Aldama (Universidad Nacional Autonoma de Mexico, Visiting Foreign Researcher of Ehime University) (メキシコ国立自治大学・愛媛大学外国人客員研究員)
時間: 16:30〜17:30
題目: Almost irresolvable spaces
Abstract: A topological space X is almost resolvable if X is the union of a countable collection of subsets each of them with empty interior. We prove that under the Continuum Hypothesis, the existence of a measurable cardinal is equivalent to the existence of a Baire crowded ccc almost irresolvable T_1 space. We also prove that:
(1) Every crowded ccc space with cardinality less than the first weakly inaccessible cardinal is almost resolvable.
(2) If 2^{\omega} is less than the first weakly inaccessible cardinal, then every T_2 crowded ccc space is almost resolvable.
講演終了後に交流会を予定しています。交流会にご参加いただける方はシャクマトフ [email protected]までご一報お願い致します。
以上、よろしくお願い申し上げます。
世話人(五十音順) 井上友喜 尾國新一 シャクマトフ ディミトリ 野倉嗣紀 平出耕一 平田浩一 藤田博司 山内貴光
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