ISSN1880−2818
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
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
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)
目 次
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