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 Sep 24 awarded Autobiographer Dec 2 awarded Scholar Dec 2 accepted Is the modular multiplicative inverse of $a$ equal to that of $-a$? Dec 2 awarded Supporter Dec 2 comment Is the modular multiplicative inverse of $a$ equal to that of $-a$? I meant that I see it's the negative in the problem you presented, not in the one I presented. But ok, I'll just use the negative of the MI of $(x_j-x_i)$ for the MI of $(x_i-x_j)$. Thank you. Dec 2 awarded Student Dec 1 comment Is the modular multiplicative inverse of $a$ equal to that of $-a$? @DonAntonio, thank you for the assignment, I'm sure. I can see that it's the negative. However, I'm new to modular arithmetic so not sure if it is just the negation or if they would be equal? Dec 1 awarded Editor Dec 1 revised Is the modular multiplicative inverse of $a$ equal to that of $-a$? added 48 characters in body Dec 1 asked Is the modular multiplicative inverse of $a$ equal to that of $-a$?