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Á°²ó¤Îµ»ö¡Ö¥³¥¢¤Ë¤«¤ó¤¹¤ëÃæÂ¼¤ÎÄêÍý¡×¤«¤é³¤¯¡¥ ÆÁÅç±Ø¤«¤é´ØÀ¾¶õ¹Á±Ø¤Þ¤Ç¤Î·ÐÏ©¤òJR ¤ª¤Ç¤«¤±¥Í¥Ã¥È¤Çº£Ä´¤Ù¤ë¤È¡¤ ¤¹¤°¼ê¤ËÆþ¤ëÆ»¶ñ¤ò»È¤ï¤Ê¤¤¡¥¼êµö¤Ë¤¢¤ëÆ»¶ñ¤ËÈ÷¤ï¤Ã¤Æ¤¤¤ëµ¡Ç½¤òÍøÍѤ·¤Ê¤¤¡¥¤½¤Î¤³¤È¤Ë¤è¤Ã¤Æ´Êñ¤Ë¤Ç¤¤ë¤Ï¤º¤Î»Å»ö¤ò¤Ò¤¸¤ç¤¦¤Ë¤á¤ó¤É¤¦¤Ê¤ä¤êÊý¤Ç¤ä¤Ã¤Æ¤¤¤ë¤Ò¤È¤Ï¾¯¤Ê¤¯¤Ê¤¤¤À¤í¤¦¡¥Ê£¿ô¥Õ¥¡¥¤¥ë¤Î°ì³ç¸¡º÷¤¬¤Ç¤¤ë¤³¤È¤ò˺¤ì¤Æ¡¤²¿½½¤È¤¤¤¦¥Õ¥¡¥¤¥ë¤ò¤Ò¤È¤Ä¤Ò¤È¤Ä¸¡º÷¤·¤¿¤³¤È¤¬¤¢¤ë¤Ò¤È¤â¤¤¤ë¤«¤â¤·¤ì¤Ê¤¤¡¥¥Ü¥¯¤ÎÃΤê¹ç¤¤¤Î¤¢¤ëÅìÂçÀ¸¤Ï¡¤¥Æ¥¥¹¥È¥¨¥Ç¥£¥¿ (¥ï¡¼¥É¥×¥í¥»¥Ã¥µ¤À¤Ã¤¿¤«¤â) ¤Î¥ï¡¼¥É¥é¥Ã¥×µ¡Ç½¤òÃΤ餺¡¤¤È¤Æ¤âŤ¤¹Ô¤Î¤¢¤ëʸ½ñ¤òÆÉ¤à¤¿¤á¤Ë²èÌ̤ò²¿Å٤ⱦº¸¤Ë¥¹¥¯¥í¡¼¥ë¤·¤Æ¤¤¤¿¤³¤È¤¬¤¢¤Ã¤¿¡¥Ê£»¨¤Ê¤³¤È¤ÏÍý²ò¤Ç¤¤ë¤Î¤Ë¶µ¤¨Êý¤¬²¼¼ê¤Ê¶µ°÷¤¬¤È¤¤É¤¤¤¤ë¤Î¤Ï¡¤Èà¤é¤¬±ó²ó¤ê¤ÊÏÀÍý¤Çʪ»ö¤òÍý²ò¤Ç¤¤ë¤¿¤á¡¤´Êñ¤ÊÏÀÍý¤òÄɵ᤹¤ëÅØÎϤò¤·¤Ê¤¤¤¿¤á¤«¤â¤·¤ì¤Ê¤¤¡¥¤½¤¦¤¤¤¦¤Î¤ÏƬ¤¬¤¤¤¤¤È¤¤¤¦¤Ù¤¤«°¤¤¤È¤¤¤¦¤Ù¤¤«Ê¬¤«¤é¤Ê¤¤¤¬¡¤¤¢¤ë¼ï¤ÎÈþ°Õ¼±¤¬·ç¤±¤Æ¤¤¤ë¤È¤Ï¸À¤¨¤ë¤À¤í¤¦¡¥ ¤¸¤Ä¤Ï¡ÖÃæÂ¼¤ÎÄêÍý¡×¤Î¥ª¥ê¥¸¥Ê¥ëÏÀʸ (Nakamura, 1979) ¤Ë¤â¡¤¤³¤ÎÎत¤Î±ó²ó¤ê¤¬¸«¤é¤ì¤ë¤È¤¤¤¦¡¥ÃæÂ¼¤ÎÄêÍý¤¬¤É¤¦µ½Ò¤µ¤ì¤Æ¤¤¤ë¤«¡¤ºÙ¤«¤¤ÅÀ¤Ï¾Êά¤·¤ÆÂåɽŪ¤Ê·Á¤ò 3 ¤Äµó¤²¤Æ¤ß¤è¤¦¡¥(ÄêÍý¤Î°ÕÌ£¤Ïʬ¤«¤é¤Ê¤¯¤Æ¤â¡¤3 ¤Ä¤Î·Á¤Î¹½Â¤¤ËÃíÌܤ·¤Æ¤¯¤ì¤ì¤Ð¡¤¤³¤Îµ»ö¤Î¥Ý¥¤¥ó¥È¤ÏÇİ®¤Ç¤¤ë¤Ï¤º¡¥) °Ê²¼¤Ç X ¤ÏÁªÂò»è½¸¹ç¤Ç¤¢¤ê¡¤¡ÖX ¤ÎÍ×ÁÇ¿ô¤¬ÃæÂ¼¥Ê¥ó¥Ð¡¼Ì¤Ëþ¡×¤Ï¡Ö#X <¦Í(¦Ø)¡×¤ÈÁ°¤Îµ»ö¤Ç¤Ï½ñ¤¤¤¿¾ò·ï¡¥¤¤¤¦¤Þ¤Ç¤â¤Ê¤¯¡¤¢ª ¤Ï only if ¤Î¤³¤È¤Ç¤¢¤ê¡¤¢«¢ª ¤Ï if and only if ¤Î¤³¤È¡¥¸å½Ò¤¹¤ë Figures ¤â»²¾È¡¥
¤¿¤È¤¨¤Ð²¬ÅÄ (1996; ÄêÍý 10.17) ¤Ï 3 ÈÖÌܤηÁ¼°¤Ë¤Ê¤Ã¤Æ¤¤¤ë¡¥¤Ê¤ª¡¤¡ÖÂåɽŪ¡×¤È¤Ï¤¤¤Ã¤¿¤¬¡¤ºÇ½é¤Î·Á¤Ï¤Û¤«¤Îʸ¸¥¤Ç¤Ï¸«¤¿¤³¤È¤¬¤Ê¤¤¡¥
¾å¤Î 2ÈÖÌܤÈ3ÈÖÌܤηÁ¤Ï¤É¤Á¤é¤¬¤è¤ê°ìÈÌŪ¤È¤¤¤¦¤³¤È¤Ï¤Ê¤¤¡¥°ìÈÌÀ¤«¤é¤ÏÈæ³ÓÉÔǽ¤Ç¤¢¤ë¡¥°ìÊý¡¤1ÈÖÌܤηÁ¤Ï2ÈÖÌܤÈ3ÈÖÌܤòÆÃ¼ì¤Ê¾ì¹ç¤È¤·¤Æ¤Õ¤¯¤ó¤Ç¤¤¤ë¡¥¤Ä¤Þ¤ê¡¤1 ¤Ï 2 ¤È 3 ¤Î¤¤¤º¤ì¤è¤ê¤â°ìÈÌŪ¤Ê¤Î¤À¡¥¤µ¤é¤Ë¤¤¤¨¤Ð¡¤¤è¤ê°ìÈÌŪ¤Ç¤¢¤ë 1 ¤Ï 2 ¤È 3 ¤«¤é¤¹¤°¤·¤á¤»¤ë¡¥
¤³¤³¤Ç¾åµ¤ÎÄêÍý·Á 1, 2, 3 ¤ËÂбþ¤¹¤ë Figures ¤òÁÞÆþ¤·¤Æ¤ª¤¯¡¥¤¿¤À¤· 3 ¤Ï (3a) ¤È (3b) ¤È¤¤¤¦¼çÄ¥¤Ëʬ¤±¤Æ¤¢¤ë¡¥ Figures: Variants of Nakamura's theorem. The following assertions about Fin (finite N), Nak (the Nakamura-number cap), C (nonempty core) are indicated:
Observe the following:
¤ï¤¶¤ï¤¶°ìÈÌÀ¤ÎÄ㤤 2, 3 ¤Î·Á¤Ç¤Õ¤¿¤Ä¤ÎÄêÍý¤òÄ󼨤¹¤ë¤è¤ê¤Ï¡¤¤è¤ê°ìÈÌÀ¤Î¹â¤¤ 1 ¤Î·Á¤Ç¤Ò¤È¤Ä¤ÎÄêÍý¤òÄ󼨤¹¤ëÊý¤¬¥¨¥ì¥¬¥ó¥È¤Ç¤¢¤ë¤Ï¤º¤À¡¥¤È¤³¤í¤¬ÉԻ׵Ĥʤ³¤È¤Ë¡¤Nakamura (1979) ¤Ï 2, 3 ¤Î·Á¤ÇÄ󼨤¹¤ëÊý¤òÁª¤ó¤Ç¤¤¤ë¡¥¤â¤Á¤í¤ó¡¤¡Ö2, 3 ¤«¤é 1 ¤òƳ½Ð¤¹¤ë¤Î¤Ï´Êñ¤Ê¤Î¤Ç¡¤ÃæÂ¼¼«¿È¤Ï¤ä¤ëɬÍפò´¶¤¸¤Ê¤«¤Ã¤¿¤À¤±¤À¤í¤¦¡×¤È²±Â¬¤¹¤ë¤³¤È¤Ï²Äǽ¤À¡¥¤À¤¬¡¤¤½¤Î²±Â¬¤¬Àµ¤·¤¤¤È¤Ï»×¤¨¤Ê¤¤¡¥2 ¤Î¾ÚÌÀ¤¬¤¢¤Þ¤ê¤Ë¤â¹âÅ٤ʤ¿¤á¤Ç¤¢¤ë¡¥¡ÖǤ°Õ¤ÎÁª¹¥¥×¥í¥Õ¥¡¥¤¥ë¤Ë¤¿¤¤¤·¤Æ¥³¥¢¤¬Èó¶õ¤Ç¤¢¤ë ¢ª X ¤¬Í¸Â¤Ç¤¢¤ë¡×¤È¤¤¤¦¡¤¤¹¤°¤Ë»È¤¨¤ë¡ÖÆ»¶ñ¡×¤¬¤¢¤ë¤Î¤ËÍøÍѤ·¤Æ¤¤¤Ê¤¤¤¿¤á¡¤´Êñ¤Ë¤Ç¤¤ë¤Ï¤º¤Î¾ÚÌÀ¤¬ (¤á¤ó¤É¤¦¤È¤Ï¤¤¤ï¤Ê¤¤¤Þ¤Ç¤â) ÉÔɬÍפ˹âÅ٤ˤʤäƤ¤¤ë¤Î¤À¡¥1 ¤Î·Á¤ò»×¤¤¤Ä¤¯¤³¤È¤¬¤Ç¤¤¿¤Ê¤é¤Ð¡¤¤½¤Î¡ÖÆ»¶ñ¡×¤Ï¤¿¤Á¤Þ¤ÁÍøÍѤǤ¤¿¤Ï¤º¤À¤«¤é¡¤¤½¤Î¤è¤¦¤Ê¾ÚÌÀ¤¬±ó²ó¤ê¤Ç¤¢¤ë¤³¤È¤Ë¤Ï¤¹¤°µ¤¤Å¤¤¤¿¤Ï¤º¤À¡¥
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¥Ü¥¯¼«¿È¤Ï¡¤ÃÞÇȤΠProfessor Goldchild ¤«¤é¼ø¤«¤Ã¤¿ÃæÂ¼·òÆóϺ°ä¹Æ½¸¤Ë¼ý¤á¤é¤ì¤¿¥ª¥ê¥¸¥Ê¥ëÏÀʸ¤ò¸«¤¿¤È¤¡¤¤½¤Î°ìÈÌÀ¤Î¹â¤µ¤Ë´¶¿´¤·¤¿µ²±¤¬¤¢¤ë¡¥(¸Ä¿Í¤Î½¸¹ç¤âÁªÂò»è¤Î½¸¹ç¤â̵¸Â¤Ë¤Ê¤ë¤³¤È¤òµö¤·¤Æ¤¤¤ë¡¥Áª¹¥¤ÏÈó½Û´ÄÀ¤À¤±²¾Äꤷ¤Æ¤¤¤ë¡¥¥·¥ó¥×¥ë¥²¡¼¥à¤ËñĴÀ¤Ê¤É¤Î¾ò·ï¤ò¤Ä¤±¤Æ¤¤¤Ê¤¤¡¥) ¤½¤Î¥¨¥ì¥¬¥ó¥È¤ÊÄêÍý¤Î¾ÚÌÀ¤¬¡¤¤³¤Î¤è¤¦¤ËÉÔɬÍפʱó²ó¤ê (¤¢¤ë¤¤¤Ï¹âÅ٤ʾÚÌÀ¤Ë¤è¤ë²á¾ê¤Ê¥¨¥ì¥¬¥ó¥È¤µ¤ÎÄɵá) ¤Ë¤è¤Ã¤ÆÀ®¤êΩ¤Ã¤Æ¤¤¤¿¤³¤È¤Ï°Õ³°¤À¤Ã¤¿¡¥ »²¹Íʸ¸¥Masahiro Kumabe and H. Reiju Mihara. Computability of simple games: A characterization and application to the core. MPRA Paper 437, Munich University Library, July 2006. H. Reiju Mihara. The second-price auction solves King Solomon's dilemma. Available at SSRN, August 2006. K. Nakamura. The vetoers in a simple game with ordinal preferences. International Journal of Game Theory, Vol. 8, pp. 55-61, 1979. ²¬ÅľÏ. ¥²¡¼¥àÍýÏÀ. ÍÈå³Õ, 1996. 10.4 Àá (323 ¥Ú¡¼¥¸¡Ö¼¡¤Ë¡¤¾ùÅϲÄǽ¤Ê¸úÍѤò²¾Äꤷ¤Ê¤¤Åêɼ¥²¡¼¥à¤Ë¤Ä¤¤¤Æ½Ò¤Ù¤è¤¦¡×°Ê¹ß), 9.5 Àá¡¥ ¸åµ 11·î5Æü¡¤¡ÖÂà¶þ¤Ê·êËä¤áºî¶È¤Ü¤Á¤Ü¤Á¿Ê¹ÔÃæ¡×¤ËÄɵ¤ò²Ã¤¨¤¿¡¥ ¡ÖÂç³ØÆþ»î²áµîÌä³èÍÑÀë¸À¡×(¼ÂÂ֤ϡÖÂç³ØÆþ»î²áµî³èÍÑÀ©¸Â¡×?) ¤ò¼õ¤±¤Æ¡¤11·î9Æü¡¤¡Ö¾¸©¤È¤Û¤ÜƱ¤¸ÌäÂê¤Ð¤«¤ê¤òÆþ»î¤Ë½ÐÂꤷ¤Æ¤·¤Þ¤Ã¤¿À¶¿åÅì¹â¹»¡×¤ËÄɵ¤ò²Ã¤¨¤¿¡¥ Äɵ (11/10/06). ¿Þ¤È¥¥ã¥×¥·¥ç¥ó¤òÄɲä·¡¤¤½¤ì¤Ë¤È¤â¤Ê¤¤¼ã´³ÀâÌÀ¤ò½¤Àµ¤·¤¿¡¥(¥Õ¥ì¡¼¥à¥ï¡¼¥¯¤ò¸ÂÄꤷ¤¿¤êÁ°Äó¤òÆÃ¼ì²½¤¹¤ë¤³¤È¤Ë¤è¤ê) ÍøÍѤǤ¤ë¾ò·ï¤òÁý¤ä¤¹¤³¤È¤Ç¡¤¤â¤È¤â¤È¹â¤¤°ìÈÌÀ¤ò»ý¤ÄÄêÍý¤Î¾ÚÌÀ¤ò´Êñ²½¤¹¤ë¤³¤È¤Ï¤è¤¯¹Ô¤ï¤ì¤ë¡¥¥Æ¥¥¹¥È¥Ö¥Ã¥¯¤ÎÁ°½ñ¤¤Ë¡Ö°ìÈÌÀ¤òµ¾À·¤Ë¤·¤¿¤¦¤¨¤Ç´°Á´¤Ê¾ÚÌÀ¤òÍ¿¤¨¤¿¡×¤È¤è¤¯¤¢¤ë¤Î¤Ï¼þÃΤΤȤª¤ê¤À¡¥Kumabe and Mihara (2006) ¤Ë¤è¤ëÃæÂ¼ÄêÍý¤Î¤ª¤â¤·¤í¤¤¤Î¤Ï¡¤(Nakamura ¤ÎÍøÍѤ·¤Ê¤«¤Ã¤¿) ¤¢¤ë¾ò·ï (͸¿Ϳô¾ò·ï) ¤ò¤¦¤Þ¤¯ÍøÍѤ¹¤ë¤³¤È¤Ë¤è¤ê¾ÚÌÀ¤ò´ÊÁDz½¤¹¤ë°ìÊý¤Ç¡¤°ìÈÌÀ¤â³ÈÄ¥¤·¤¿¤³¤È¤À¡¥(ñ¤ËÄêÍý·Á 2, 3 ¤òÄêÍý·Á 1 ¤Ë°ìÈ̲½¤·¤¿¤À¤±¤Ç¤Ê¤¯¡¤¡ÖÄó·È¡×³µÇ°¤¬¤è¤ê½ÀÆð¤ËÄêµÁ¤Ç¤¤ë¥Õ¥ì¡¼¥à¥ï¡¼¥¯¤Ø³ÈÄ¥¤·¤Æ¤¤¤ë¡¥) ¡ÖÆÃ¼ì²½¤òµ¶Áõ¤·¤¿°ìÈ̲½¡×¤È¤Ç¤â¤è¤Ö¤Ù¤°Õ³°À¤ò¤½¤³¤Ë¸«¤ë¤³¤È¤¬¤Ç¤¤ë¡¥ |
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