Originally Posted by flyingsquirrel For example : but the other way is wrong : If we multiply the modulo and the congruence by 2, both ways are correct : Because 2 has no inverse in Z/2Z. Here, we multiplied by the inverse of a number, so it'll always work.
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Originally Posted by flyingsquirrel For example : but the other way is wrong : If we multiply the modulo and the congruence by 2, both ways are correct : Originally Posted by Moo Because 2 has no inverse in Z/2Z. Here, we multiplied by the inverse of a number, so it'll always work. It has nothing to do with inverses in the forward direction. If then it means then certainly so thus .
Originally Posted by ThePerfectHacker It has nothing to do with inverses in the forward direction. If then it means then certainly so thus . I think we were more talking about the reversal of the implication lol, a little off-topic
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