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Aryan's user avatar
Aryan
  • Member for 3 years, 5 months
  • Last seen this week
  • Rasht, Gilan Province, Iran
8 votes
1 answer
360 views

Prove that the sum of the digits of $9^n$ is not equal to $9$ for $n \ge 3$

6 votes
2 answers
474 views

A possible upper bound on the fractional part of exponential functions

6 votes
1 answer
158 views

Limit of a series with interchanging signs

5 votes
1 answer
344 views

Elementary proof for $\varphi(n)\ge\frac n{2\log(\log(n))}$

2 votes
1 answer
509 views

n-"Kings" Problem

2 votes
1 answer
147 views

Irreducible polynomial divisible by all primes

1 vote
3 answers
120 views

Side-limit of $f(x)=\frac{x^2\cdot\lfloor x\rfloor}{|x-1|}$

1 vote
1 answer
79 views

Generalization of a minor LTE lemma

1 vote
1 answer
133 views

If $A^TB$ is a symmetric matrix, then $XA=B$ has a symmetric matrix solution

1 vote
0 answers
46 views

Uniformity of integral curves with respect to initial conditions

1 vote
0 answers
100 views

Further resources on category theory

1 vote
1 answer
173 views

A prime problem in Fibonacci sequence

0 votes
0 answers
31 views

On motivations of continuous geometry

0 votes
0 answers
42 views

Serial-sided polygons with given angle condition

0 votes
0 answers
58 views

An "interwined" system of modular equations