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re: Tautology

After thinking better of my sarcastic tone to Carrol's message. Let me
explain.

A tautology is a statement that is true by definition. That is, it is
always true.

A = A is a tautology.

A = B is not a tautology. That is, it might be false.

Similarly all true statements are not tautologies. I.e., A = B might be
true.

If all statements were tautologies, math and logic would be very easy.
Anything you write down would be true. No need to prove anything.

--
Rod Hay
rodhay@xxxxxxxxxx
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