Mathematics
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ZFR's user avatar
ZFR
  • Member for 8 years, 10 months
  • Last seen this week
  • New York, NY, USA
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About

I am a PhD student in math in one of the US universities and I am interested in combinatorics(extremal, probabilistic, additive) and graph theory.

I am also very grateful to all users who always help me.

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All Questions Answers
Score Newest
question
21
Sum of series $\sum \limits_{k=1}^{\infty}\frac{\sin^3 3^k}{3^k}$
Jan 23, 2017
question
18
Infinite group has infinitely many subgroups, namely cyclic subgroups.
Nov 30, 2017
question
16
Every separable metric space has a countable base
Jun 3, 2016
question
16
Erroneous proof that derivative of function is always continuous
Apr 15, 2021
question
15
A finite set is closed
Jun 8, 2015
answer
15
$A+B+C+7$ is perfect square where $A,B,C$ numbers with repeating digits.
Oct 29, 2015
question
14
Number which is simultaneously sum of 2 and 3 squares [closed]
Nov 25, 2017
question
11
Ternary representation of Cantor set
Aug 30, 2015
question
11
How not to define density of a subset of $\mathbb{Z}^2$
Sep 5
answer
10
If $\lim_{x \to \infty} (f(x)-g(x)) = 0$ then $\lim_{x \to \infty} (f^2(x)-g^2(x)) = 0\ $: False?
Nov 12, 2015

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