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 Apr 19 awarded Teacher Apr 19 answered What's the mathematical symbol to say “It doesn't depend on …”? Mar 1 comment Maximum of $F(x,y)=(2x^2-y)(y-x^2)$ In case anybody is interested I've found this equation is called "Peano Surface" Feb 27 awarded Commentator Feb 27 comment Maximum of $F(x,y)=(2x^2-y)(y-x^2)$ This is what I said "The Hessian at (0,0) is zero." And, as I also said to Matthew, in that case you need to keep getting derivatives of higher order. It gets more difficult. Feb 27 comment Maximum of $F(x,y)=(2x^2-y)(y-x^2)$ In fact I have only calculated the first derivatives, but I think I should keep derivating till the first derivative different to zero. And check the parity.... Feb 27 asked Maximum of $F(x,y)=(2x^2-y)(y-x^2)$ Jan 29 comment What's the mathematical symbol to say “It doesn't depend on …”? I just want to know it in general, if there exist such a symbol. Jan 28 comment What's the mathematical symbol to say “It doesn't depend on …”? @William Stagner Depend on means that if you modify the value of x then y also modifies its value. And if we were speaking about random variables it would mean that the distribution of y is different for different values of x Jan 28 asked What's the mathematical symbol to say “It doesn't depend on …”? Sep 18 revised hyperpower modular added 284 characters in body Jun 24 asked Selecting a proper p-value (Chi-squared) Apr 22 awarded Editor Apr 22 revised Differences between GAP and PARI/GP? added 337 characters in body Dec 21 awarded Student Dec 18 comment hyperpower modular I think I've found a way to solve some of these problems. I didn't find it myself but I found it on the Internet. Using $a^i \equiv a^j \pmod {m} \Leftrightarrow{} i \equiv j \pmod{e}$. Where e is the multiplicative order, $e=ord_m (a)$, that's the smallest k that makes $a^k \equiv 1 \pmod{m}$, And it can be used only if $gcd(a,m)=1$ Dec 17 asked Differences between GAP and PARI/GP? Dec 17 comment hyperpower modular Or something maybe easier, $a \uparrow \uparrow b \mod c$ such as $7^{7^{7^{7^{7^{7^{7}}}}}} \mod 17$ Dec 17 comment hyperpower modular For example how much is ...? $8^{7^{6^{5^{4^{3^{2}}}}}} \mod 17$ Dec 17 awarded Supporter