区間が重なるためのある条件式と `Range#overlaps?` の定義は同じなのか
Rails で定義されている Range#overlaps? の定義は def overlaps?(other) cover?(other.first) || other.cover?(firs...
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Haskell で (a == 1 && a == 2 && a == 3) を真にする
Stack Overflow の記事 Can (a ==1 && a== 2 && a==3) ever evaluate to true? が元ネタらしい。 こ...
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