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Mathematics
Hamid Reza Ebrahimi's user avatar
Hamid Reza Ebrahimi's user avatar
Hamid Reza Ebrahimi's user avatar
Hamid Reza Ebrahimi
  • Member for 8 years, 11 months
  • Last seen more than a month ago
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10
Show that among any consecutive $16$ natural numbers one is coprime to all others
May 11, 2016
9
For function $f:[0,1]\rightarrow \Bbb R$ we know : $f(x+y)\geq f(x)+f(y)$.Prove that $f(x)\leq 2x$
Nov 4, 2017
9
Verify surjectivity of the function $f$ satisfying: $f(x)+f(x^2)=x$
Jan 1, 2018
7
Find all positive integers satisfying: $x^5+y^6=z^7$
Jul 12, 2016
6
Minimum number of fractions to be summed up to $\frac45$
Oct 16, 2015
6
What's $\alpha+\beta$ if we have: $\alpha^3-6\alpha^2+13\alpha=1$ and $\beta^3-6\beta^2+13\beta=19$ ($\alpha$ and $\beta$ are Real)
Feb 18, 2016
6
Find all polynomials with real coefficients $P(x),Q(x)$ such that for every real number $x$ we have: $P(Q(x))=P(x)^{2017}$
Aug 14, 2017
5
Find all positive integers $k,m,n$ satisfying: $\frac1k+\frac1m+\frac1n=\frac{1}{1996}$
Jul 11, 2016
5
Find all integer roots of: $x^2(y-1)+y^2(x-1)=1$
Jul 14, 2016
5
Find $I$ in $\frac{\overline{SIX}}{\overline{NINE}}=\frac23$
Jun 15, 2016
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Academic advantages of activity on SE
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Number sets symbols in Mathjax
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How to archive and backup our questions to our own PC just in case?