Tuesday, 13 August 2013

Which is correct?

Which is correct?

Which is correct?
$$a\equiv b\;\text{mod}\;m\Longleftrightarrow m\mid a-b$$ or $$a\equiv
b\;\text{mod}\;m\Longleftrightarrow m\mid b-a$$with$$a,b,m\in
\mathbb{N}$$?

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