Mathematical signs

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- Oct 27th 2008, 10:04 AMthegardenDivisibilty proofs?
Mathematical signs

- Oct 27th 2008, 05:31 PMThePerfectHacker
Use definition of division. I do the first one. $\displaystyle a|1 \implies 1 = ab \implies a=\pm 1$.

And second one $\displaystyle a|b \implies a = bc$, $\displaystyle b|a\implies b = ad$.

Thus, $\displaystyle a = bc = adb \implies 1 = bd \implies d = \pm 1$ (assuming $\displaystyle a\not = 0$).