Prove that 3 is even.

For something to be even the equation f(x)=f(-x) must be true.
Lets say f(x)=3
With that f(x)=f(-x) is 3=3 which is a true statement and our assumption is true, 3 is even.

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Louis54 · 61-69, M

Cute sleight of hand! You are, of course, mixing two different notions of 'even': That the constant function f(x)=3 is an even function, is not the same as its value 3 being an even number.