wasn't this problem solved by a UIUC group in the 80s?
所有跟贴·加跟贴·新语丝读书论坛http://www.xys.org/cgi-bin/mainpage.pl
送交者: PhonyDoctorPhD 于 2006-5-26, 11:04:29:
回答: ZT: 凄美的梦:董德周和数学难题“四色猜想” 由 Nixrreg 于 2006-5-26, 10:03:24:
所有跟贴:
加跟贴
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