No Stupid Questions@lemmy.world · 8 months ago

Is "If A then B" equal to "B if and only if A"?

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No Stupid Questions@lemmy.world · 8 months ago

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8 months ago
“If X is cat, then X is mammal” =?> “X is mammal if and only if X is cat”

Obviously doesn’t hold: What if X doge?

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