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 Oct 21 revised Fermat primality test $\gcd$ condition and carmichael numbers added 5 characters in body Oct 21 accepted Fermat primality test $\gcd$ condition and carmichael numbers Sep 15 accepted Is $f(x_1, x_2) = x_1^2 + x_2^2 - 1$ a function? Sep 15 comment Is $f(x_1, x_2) = x_1^2 + x_2^2 - 1$ a function? @Karl I asked him, he told me that $f$ is a curve. I'm pretty sure that he clearly stated that "$f$ is not a function". I just didn't want to make an argument. Sep 15 revised Is $f(x_1, x_2) = x_1^2 + x_2^2 - 1$ a function? edited body; edited title Sep 15 asked Is $f(x_1, x_2) = x_1^2 + x_2^2 - 1$ a function? Aug 24 awarded Curious Aug 23 revised Fermat primality test $\gcd$ condition and carmichael numbers added 39 characters in body; edited title Aug 23 awarded Citizen Patrol Aug 23 awarded Critic Aug 23 revised Fermat primality test $\gcd$ condition and carmichael numbers added 64 characters in body Aug 23 asked Fermat primality test $\gcd$ condition and carmichael numbers Nov 29 awarded Autobiographer Jul 12 awarded Notable Question May 27 accepted Does $p \equiv q \pmod a \implies p \bmod a = q \bmod a$? May 27 asked Does $p \equiv q \pmod a \implies p \bmod a = q \bmod a$? Dec 26 awarded Yearling May 22 awarded Popular Question May 21 awarded Nice Question May 21 accepted Why doesn't integrating the area of the square give the volume of the cube?