Quote 21 Aug 82 notes

砂山のパラドックスの起源は、一般に古代ギリシャの哲学者ミレトスのエウブリデスが作ったとされるハゲ頭のパラドックス(Paradox of the Bald Man)に帰せられる[1]

ハゲ頭のパラドックス [編集]

「髪の毛が一本もない人はハゲである」(前提1)
「ハゲの人に髪の毛を一本足してもハゲである」(前提2)

ここで前提1 に前提2 を繰り返し適用していく(つまりツルッパゲの人に髪の毛を一本ずつ足していく)。そして次の結論を得る。

「よって全ての人はハゲである」(結論)
— 

砂山のパラドックス - Wikipedia

中学で数学的帰納法を習ったときにこのジョークが流行ったが、こんなに歴史があったのか。

(via bgnori)

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    ステキ理論再び。
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