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dan_fulea

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

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20 A conjecture related to a circle intrinsically bound to any triangle Jul 4 '18
15 For $A \in \mathcal{M}_3(\mathbb{C})$, does $\mathrm{tr}(A^2) = \mathrm{tr}(A^3) \in \mathbb{Q}$ imply $\mathrm{tr}(A^4) \in \mathbb{Q}$? Sep 11 '19
14 Help with Seemingly Hopeless Double Integral Mar 26 '19
10 A ring such that $(a+b)^2=a^2+b^2$ and $(a+b)^3=a^3+b^3$ Sep 17 '18
9 alternate deletion of integers between 1 and 128, which is the last one? Aug 23 '18
8 If there exists a positive integer $n$ such that any element $x$ of a ring $R$ satisfies $x^{4^n+2} = x$, then every element $x$ in $R$ is idempotent Nov 28 '19
8 How many numbers can we select from $\{1,2,…2016\}$ such that sum of any four of them cannot be divided by $11$ Jan 1
7 Sum of the inverse squares of the hypotenuse of Pythagorean triangles Oct 23 '19
7 Prove a trigonometric identity: $\cos^2A+\cos^2B+\cos^2C+2\cos A\cos B\cos C=1$ when $A+B+C=\pi$ Sep 11 '19
7 If 2C8$\cdot$3C1$=$90C58, what is C? Aug 16 '19
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