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数理解析研究所講究録 1619

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ISSN18802818

数理解析研究所講究録 1619

組合せ論的集合論と記述集合論

京都大学数理解析研究所

2008 年 12 月

(2)

RIMS K6kyOroku Z6I9

Combinatorial and Descriptive Set Theo7y

December, 2008

Research .lnstztute for Mathematical Sciences

KIyoto University, 1¡yoto, lapan

This is a report of research done at the Research Institute fbr Mathematical

Sciences, Kyoto Umversity The papers contained herein are m final fbrm

and will not be submitted for publication elsewhere

(3)

組合せ論的集合論と記述集合論 Combmatorial and Descnptive Set Theory

RIMS研究集会報告集

2008年8月25日〜8月29日

研究代表者 ブレンドレ ヨーグ(Jorg Brendle)

1ULTRAPRODUCTS OF FINITE ALTERNATING GROUPS e−ee 一d一 一 一一一一一 一 一一一 ee1 Rutgers U Paul Elhs

ll Sherwood Hachtman ,, Scott Schneider ii Simon Thomas

2FURTHER COMBINATORIAL PROPERTIES OF COHEN FORCING一 一一 m一一 e 一e−8 Kurt Gddel Res Center Math Logic Vera Fischer

York U Juns Steprans

3Description of some ultrafilters via1−ultrafilters 一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一20 UWest Bohemia Jana Flagkova

4Left−separated topological spaces under Fodor−type Reflection Prmciple 一一一一一一一一一一一一一一一一一一一32

中部大・工(Chubu U) 渕野 昌(Saka 6 Fuchmo)

5FUNCTIONS WITH MANY LOCAL EXTREMA 一一一一一一一一・一一一一一一一一一一一一一一一一一・一一一一・・一一一一一一一一一一…一一43 Boise State U Stefan Geschlce

6There are more co−analytic sets than B orel 一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一48

UMelbourne Greg HJ orth

7Pair−reapmg,fimte chromatic ideal and Smirnov compactifications of ca 一一一一一一一一一一一一一一一一一一一52

大阪府大・理学系(Osaka Prefecture U) 嘉田 勝(Masaru Kada)

8The branching structure of trees on directed sets 一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一57

早大本庄高等学院(Waseda U HonJo Semor High School)

朝戸 正之(Masayukl Karato)

9

A maximal forcmg axiom compatible wrth weak club guessmg 一一一一一一一一一一一一一一一一一一一一一一一一一一一一

63

南山大・数理情報(Nanzan U) 宮元 忠敏(Tadatoshl Mlyamoto)

1O Specker phenomenon m the countable case 一d一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一76

早大・基幹理工学(Waseda U) 中村 順(Jun Nakamura)

1 1

The Cardinal lnvanants of certam ldeals related to the Strong Measure Zero ldeal 一一一一一一

83

大阪府大・理学系(Osaka・PrefectUre U) 大須賀 昇(Noboru Osuga)

1 2A variant of the Banach−Mazur game and knot pomts of typical contmuous functions 一一91

九大・数理学(Kyushu U) 斎藤 新悟(Shlngo Salto)

1 3A remark on Martln s maxlmum 一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一97

神戸大・工学(Kobe U) 酒井 拓史(Hlroshl Saka 1)

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