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Sarastro

Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 7 years, 11 months
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  • Last seen Mar 4 at 4:04

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41 If $x$, $y$, $x+y$, and $x-y$ are prime numbers, what is their sum? Dec 4 '12
18 Matrices - Conditions for $AB+BA=0$ Aug 22 '12
18 The minimum value of $a^2+b^2+c^2+\frac1{a^2}+\frac1{b^2}+\frac1{c^2}?$ Mar 29 '13
11 If $y=x^{x^{x^{x^{x^{.^{.^{.}}}}}}}$ then how $y=x^y$? May 31 '14
8 Show that $f(x)=a_0+a_1x+a_2x^2+\cdots+a_nx^n\in R[x]$ is nilpotent iff $a_0,a_1,a_2,\ldots,a_n$ are nilpotent May 28 '15
5 How do I prove that $\{AB-BA\}$ does not span matrix space? Apr 21 '15
4 How many ways can $2m$ be represented as the sum of 4 natural numbers $\le m$? Aug 15 '13
4 $\sum_{k=0}^n \binom{n}{k}^2 = \binom{2n}{n}?$ Sep 23 '14
3 Last 3 digits of $7^{12341}$ Oct 21 '14
3 Probability and recurrence Nov 30 '14
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