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Mathematics
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sirous
  • Member for 10 years, 2 months
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  • Tehran iran
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I am a retired engineer interested in mathematics especially in number theory and geometry.Mathematics is best to activate your brain and satisfy your curiosity.

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12
Sum of series : $1+11+111+...$
Sep 29, 2016
11
Is there an elegant proof to this old problem of parallelism that dates back to the 19th century?
Dec 15, 2025
10
Can we prove this conjecture related to the trisection of the angle?
Sep 5, 2025
8
Geometry problem: square and golden ratio
Jun 30, 2025
8
How do you solve a system of quadratic equations?
Feb 17, 2017
7
Is there a square with all corner points on the spiral $r=k\theta$, $0 \leq \theta \leq \infty$?
Jul 20, 2021
7
Prove $\sum_{n=1}^{\infty} \arctan\left(\frac{1}{F_n}\right) \arctan\left(\frac{1}{F_{n+1}}\right)=\frac{\pi^2}{8}$
Apr 4, 2021
6
Will a circle projected onto a cylinder be an ellipse?
Jan 16, 2022
6
Sum to n terms the series $\cos \theta+ 2\cos 2\theta+ \cdots + n\cos n\theta$
Aug 27, 2018
6
Prove that $BD$ bisects $\angle ABC$
Apr 20, 2019