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Qurultay

Urmia, Iran

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11
Why is the Turkish president's surname spelt in Russian as Эрдоган, with г?
russian.stackexchange.com

7
Is equality of two fractions ( like $2/10$ and $1/5$) really equality or equivalence?
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7
Show that $\sqrt{1+x}<1+\frac{x}{2}$ for all $x>0$
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6
Solving a sequence limit with floor
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6
Finding the value of $\sin {^4 \frac{\pi}{16}} +\sin {^4 \frac{3\pi}{16}} +\sin {^4 \frac{5\pi}{16}} +\sin {^4 \frac{7\pi}{16}} $
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6
Functional equation $ f(x) + f\left(1-\frac{1}{x}\right) = \tan^{-1}(x) $ and definite integral
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6
Solving $f(x)$ in a functional equation
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5
finding the cardinality
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5
How do we calculate limit $\lim_{x \to 0^+} 2x\left\lfloor\frac {\pi}{\sin x}\right\rfloor$?
math.stackexchange.com

5
Is there a standard definition of $\sum_{-\infty}^{+\infty} a_n$?
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5
Finding limits for this without L'hospital's rule
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5
Is the sum of two non invertible matrices invertible?
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5
How to solve a definite integral?
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5
Proof that there exists $x= c$ s.t. $f(c)=c$
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5
closure of (0,1) on R with the co-countable topology
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5
Two different roots for $P(x) = x^4+ax^2+bx+c$
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5
Indicate on the $x$-$y$ plane the set of all points $(x,y)$ for which $[x]^2 + [y]^2 = 4$
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5
Gap between two consecutive primes/.
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5
Showing that $x^2+1\equiv 0 \mod 11$ doesn't have any solutions.
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