19/12/01 17:26:44 id6ENHqe.net
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（参考）
URLﾘﾝｸ(ja.wikipedia.org)
四色定理
目次
1 概説
2 歴史
3 証明
3.1 一般化
4 3彩色問題
5 四色問題とジョーク
”3 Summary of proof ideas”がよく纏まっている
URLﾘﾝｸ(en.wikipedia.org)
Four color theorem
Contents
1 Precise formulation of the theorem
2 History
2.1 Early proof attempts
2.2 Proof by computer
2.3 Simplification and verification
3 Summary of proof ideas
4 False disproofs
5 Three-coloring
6 Generalizations
7 Relation to other areas of mathematics
8 Use outside of mathematics