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 Apr 4 comment Check if a number is Carmichael The aim of the question is to implement a prime-testing algorithm using a method that first requires to rule out that the integer tested is a Charmichael number. Therefore "First check, whether the given number $n$ is prime" reaches that aim without requiring implementation of the rest of the answer. Apr 3 revised Calculate third point of triangle from two points and angles Make the picture visible, and smaller Apr 3 answered Calculate third point of triangle from two points and angles Apr 3 suggested approved edit on Calculate third point of triangle from two points and angles Mar 13 comment Solving $x^e\equiv a\pmod n$ I'm solving for $x$, the only unknown. @ObinnaNwakwue Feb 14 awarded Tumbleweed Feb 7 revised Name of that extension of modular inverse? Add another kept property Feb 7 revised Name of that extension of modular inverse? Polish definition Feb 7 asked Name of that extension of modular inverse? Nov 22 comment prove that a complex number equation is real @user26857: Thanks! Indeed these parenthesis were extraneous. Nov 22 revised prove that a complex number equation is real Add figure Nov 22 revised prove that a complex number equation is real added 24 characters in body Nov 22 answered prove that a complex number equation is real May 14 comment System of linear congruence, not relatively prime Hint: use that you know the factorization of all the $m_i$ to write an equivalent system of equations where all the ${m_i}'$ are prime; check if it has solutions; and determine them using the CRT. $\;$ That can be made to work even if you do not known the factorizations of the $m_i$, by using $\gcd$. Complexity is is low, dominated by the final CRT step, I guess. Jan 11 comment find the volume of the half-cone $\sqrt{x^{2}+y^{2}}0$ @Axoren. Yes; thanks for noticing anyway. Fixed this, and the next issue about legibility, within the 5 minute allowance. Jan 11 answered find the volume of the half-cone $\sqrt{x^{2}+y^{2}}0$ Dec 22 revised System of linear diophantine modular inequalities include a^j \not\equiv 1\pmod n in main statement Dec 22 revised System of linear diophantine modular inequalities use consistent terminology Dec 22 asked System of linear diophantine modular inequalities Dec 1 comment Find all the integral solutions to $x^6-y^6+3x^4y-3y^4x+y^3+3x^2+3x+1=0$ A gremlin crept in this accepted answer's algebra! $x^6-y^6+3x^4y-3y^4x+3x^2+3x+1=0$ IS NOT equivalent to $(x+1)^3+(x^2+y)^3=(x+y^2)^3$. $\;$ Proof: $x=-1$, $y=-1$ is a solution of the later, but not of the former. $\;$ Other proof: mechanically expand $(x+1)^3+(x^2+y)^3-(x+y^2)^3$, giving $x^6-y^6+3x^4y-3y^4x+3x^2+3x+y^3+1$, with that pesky $y^3$ term.