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1d
revised Whether two quotients of $\mathbb{Z}^2$ are isomorphic.
deleted 2 characters in body
Aug
19
revised Tightenning Interval Mapping
added 151 characters in body
Aug
13
revised if $ax-2by+cz=0$ and $ac-b^2>0$ , Prove $zx-y^2\leq0$
deleted 11 characters in body
Aug
6
revised Every endomorphims is a linear combination of how many idempotents in infinite dimensions?
deleted 3 characters in body
Aug
4
revised How prove this inequality with n variables
added 209 characters in body
Aug
3
revised let $a,b,c >0 $ and $abc=1$,prove that $\sqrt{1+8a^2}+ \sqrt{1+8b^2}+ \sqrt{1+8c^2}\leq 3(a+b+c )$
added 3 characters in body
Jul
27
revised Always “one double root” between “no root” and “at least one root” ? (Second version)
edited body
Jul
27
revised Always “one double root” between “no root” and “at least one root” ? (Second version)
edited body
Jul
27
revised Always a double root between “no roots” and “at least one root”?
deleted 329 characters in body
Jul
27
revised Always a double root between “no roots” and “at least one root”?
added 325 characters in body
Jul
25
revised Prove that: $\sum \frac{a^2+2bc}{(b+c)^2}\geq \sum \frac{3}{2}\frac{a}{b+c}$
added 32 characters in body
Jul
22
revised How to find a function $\phi(x)$ such that $\sqrt{1+y^2} - \sqrt{1+x^2} \geq \phi(x) (y-x)$ for each $x,y\in \mathbb{R}$
corrected spelling
Jul
17
revised How find this P(x) if $ (x^3 - mx^2 +1 ) P(x+1) + (x^3+mx^2+1) P(x-1) =2(x^3 - mx +1 ) P(x) $
added 135 characters in body
Jul
17
revised How find this P(x) if $ (x^3 - mx^2 +1 ) P(x+1) + (x^3+mx^2+1) P(x-1) =2(x^3 - mx +1 ) P(x) $
edited body
Jul
17
revised How find this P(x) if $ (x^3 - mx^2 +1 ) P(x+1) + (x^3+mx^2+1) P(x-1) =2(x^3 - mx +1 ) P(x) $
edited body
Jul
17
revised How find this P(x) if $ (x^3 - mx^2 +1 ) P(x+1) + (x^3+mx^2+1) P(x-1) =2(x^3 - mx +1 ) P(x) $
added 1270 characters in body
Jul
12
revised Minimum of $|\det(X+iC)|$
added 134 characters in body
Jul
12
revised Minimum of $|\det(X+iC)|$
deleted 2 characters in body
Jul
1
revised Is there a probabilistic proof of the inequality $4p(1-p) \leq 1$ for a probability $p$?
added 295 characters in body
Jun
13
revised Is there a simple procedure to produce algebraic numbers of modulus one that are not roots of unity?
added 34 characters in body