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15h
revised If $p$ is a prime number and $p\equiv 1(mod 4)$, (show that) there exist integers $a$ and $b$ such that $a^{2}+b^{2}=p$.
added 48 characters in body
Jul
25
revised Can $O(\sqrt{x})$ be considered $o(x)$?
added 179 characters in body
Jul
16
revised If $p\equiv1\pmod{4}$ is a prime, then $-4$ and $(p-1)/4$ are both quadratic residues of $p$.
added 257 characters in body
Jul
10
revised Let $A \subset \mathbb Z^3$ / $|A| < \infty$. Prove that: $|A| \le \sqrt{|A_x| |A_y| |A_z|}$
added 14 characters in body
Jul
10
revised How prove this inequality $(1+\frac{1}{16})^{16}<\frac{8}{3}$
added 387 characters in body
Jul
9
revised How prove this inequality $(1+\frac{1}{16})^{16}<\frac{8}{3}$
deleted 404 characters in body
Jul
9
revised How prove this inequality $(1+\frac{1}{16})^{16}<\frac{8}{3}$
edited body
Jul
9
revised Extending 2-adic valuation to real numbers
deleted 263 characters in body
Jul
6
revised Let $A \subset \mathbb Z^3$ / $|A| < \infty$. Prove that: $|A| \le \sqrt{|A_x| |A_y| |A_z|}$
added 263 characters in body
Jul
6
revised Does $ \sum_{(m,n) \neq (0,0)} \frac{(-1)^{m+n}}{m^2 + n^2} $ have an exact value?
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Jul
6
revised Does $ \sum_{(m,n) \neq (0,0)} \frac{(-1)^{m+n}}{m^2 + n^2} $ have an exact value?
added 233 characters in body
Jul
6
revised Does $ \sum_{(m,n) \neq (0,0)} \frac{(-1)^{m+n}}{m^2 + n^2} $ have an exact value?
added 567 characters in body
Jul
6
revised Does $ \sum_{(m,n) \neq (0,0)} \frac{(-1)^{m+n}}{m^2 + n^2} $ have an exact value?
added 567 characters in body
Jul
6
revised Does $ \sum_{(m,n) \neq (0,0)} \frac{(-1)^{m+n}}{m^2 + n^2} $ have an exact value?
added 13 characters in body
Jul
6
revised Sum: $1-2+3-4+5-6+…$
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Jul
6
revised Extending 2-adic valuation to real numbers
added 810 characters in body
Jul
6
revised Extending 2-adic valuation to real numbers
added 238 characters in body
Jul
6
revised Extending 2-adic valuation to real numbers
added 238 characters in body
Jul
6
revised Extending 2-adic valuation to real numbers
added 223 characters in body
Jun
29
revised Is there something between summation and integration?
added 499 characters in body