2006-08-22 ■ memo 伊藤清先生。 http://www.asahi.com/international/update/0822/017.html http://www.asahi.com/national/update/0822/TKY200608220453.html ポアンカレ予想。 http://www.asahi.com/international/jinmin/TKY200606050264.html http://www.asahi.com/international/update/0822/010.html (23日追記)http://www.asahi.com/international/update/0822/019.html (23日追記)http://www.asahi.com/international/update/0822/020.html http://kawa-kingfisher.sblo.jp/article/1148895.html http://business.nikkeibp.co.jp/article/life/20060604/103587/?P=2