ãã¤ã±ã«ã»ãã¼ãã¬ã¼ã»ããªã¼ããã³ï¼Michael Hartley Freedmanã1951å¹´4æ21æ¥ - ï¼ã¯ã¢ã¡ãªã«åè¡å½ã®æ°å¦è ã主ã«åè¡å½è¥¿é¨ã®ã«ãªãã©ã«ãã¢å·ã¨æ±é¨ã®ãã¥ã¼ã¸ã£ã¼ã¸ã¼å·ããªã³ã¹ãã³ã«ããã¦æ´»åã ãããã¸ã¼ï¼ä½ç¸å¹¾ä½å¦ï¼ã«ãããé£åã¨ããããã¢ã³ã«ã¬äºæ³ã忬¡å ã«ããã¦æç«ãããã¨ã証æãããã¨ã§ç¥ããã¦ããã1986å¹´ã«ãã£ã¼ã«ãºè³ãæä¸ãããã ç¾å¨ã¯ãã¤ã¯ãã½ãã社ã®ç ç©¶æ©é¢ãã¤ã¯ãã½ãããªãµã¼ãã«æå±ããéåã³ã³ãã¥ã¼ã¿ã®éçºã«æºããã ãã¤ã±ã«ã»ããªã¼ããã³ã¯1951å¹´ã«ããµã³ã¼ã«ã¹ã«çã¾ãã1968å¹´ã«17æ³ã§ã«ãªãã©ã«ãã¢å¤§å¦ãã¼ã¯ã¬ã¼æ ¡ã«å ¥å¦ãããã1å¹´å¾ã«ããªã³ã¹ãã³å¤§å¦ã«ç§»ããã¦ã£ãªã¢ã ã»ããã¦ãã¼(William Browder)ã®æå°ã®ä¸ãã使¬¡å 2ã®æè¡ã(Codimension-Two Surgery)ã¨é¡ãããããã¸ã¼ã«é¢ããè«æ


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