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A comment on All People in Canada are the Same Age (1997). Parent comment
This is a very common example in math classes, though in my experience usually presented as a proof that "all horses are the same color".
No cat has eight tails, and every cat has one more tall than no cat. Ergo...
This is a very common example in math classes, though in my experience usually presented as a proof that "all horses are the same color".