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- #1

I am new to the site so please let me know if I'm posting in the wrong place.

I am starting to teach myself number theory and would like a bit of help with a problem.

How would I go about showing "If m^2 = 0 (mod 3) then m = 0 (mod 3)"? I am then asked to deduce that root 3 is irrational.

If you could point me in the right direction without giving me the answer then that would be fantastic.

Best,

A