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Mathematics
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RFZ
  • Member for 10 years, 9 months
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  • New York, USA
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21
Sum of series $\sum \limits_{k=1}^{\infty}\frac{\sin^3 3^k}{3^k}$
Jan 23, 2017
19
Infinite group has infinitely many subgroups, namely cyclic subgroups.
Nov 30, 2017
19
Every separable metric space has a countable base
Jun 3, 2016
17
A finite set is closed
Jun 8, 2015
16
Erroneous proof that derivative of function is always continuous
Apr 15, 2021
15
$A+B+C+7$ is perfect square where $A,B,C$ numbers with repeating digits.
Oct 29, 2015
15
Number which is simultaneously sum of 2 and 3 squares [closed]
Nov 25, 2017
14
Ternary representation of Cantor set
Aug 30, 2015
11
A question on egyptian fractions
May 2, 2014
11
How not to define density of a subset of $\mathbb{Z}^2$
Sep 5, 2022