User Anvit

9 votes

3 answers

515 views

Calculating a limit with trigonometric and quadratic function

asked Feb 15, 2018 at 9:04

7 votes

10 answers

881 views

Binomial summation $\sum\binom nkk^2$

asked Apr 13, 2018 at 12:44

6 votes

3 answers

1k views

Number of solutions to $1/x+1/y=1/1995$ in $\mathbb N^2$ [duplicate]

asked May 27, 2018 at 9:37

5 votes

1 answer

1k views

Multiplying congruences.

asked May 27, 2018 at 16:01

5 votes

3 answers

609 views

Integral part of sum of huge powers

asked Apr 2, 2018 at 8:25

5 votes

2 answers

71 views

Find positive $K$ such that $\int_0^\infty\left(\frac{1}{\sqrt{2x^2+1}}-\frac{K}{x+1}\right)dx$ converges

asked Feb 10, 2019 at 8:58

5 votes

1 answer

238 views

Minimum number of lattice points required so that there exists three points whose mean is also a lattice point

asked Feb 11, 2020 at 7:37

4 votes

1 answer

114 views

Prove that $\lim_{x\to\infty}\sum_{n=1}^{\infty}\frac x{n^2+x^2}$ exists and is positive

asked Apr 21, 2019 at 9:05

4 votes

1 answer

122 views

Given $G,H_1,H_2$ finite abelian groups and $G\times H_1 \cong G\times H_2$ then $H_1 \cong H_2$ [duplicate]

asked Sep 8, 2019 at 11:32

4 votes

1 answer

40 views

Infinite product with non homogenous recurrence relation

asked Apr 23, 2018 at 16:19

4 votes

2 answers

112 views

Is $\int_{-2}^3\frac{1}{x^3}dx=\frac5{72}$ or not defined?

asked Jun 16, 2018 at 11:57

4 votes

2 answers

91 views

Every prime number has multiple of form $100\dots01$

asked May 12, 2018 at 11:42

4 votes

5 answers

98 views

Calculate $\sum\limits_{k=0}^{20}(-1)^k\binom{k+2}2$ without calculating each term separately

asked May 8, 2018 at 15:40

4 votes

0 answers

411 views

Draw a perpendicular to diameter with only a straight edge

asked May 11, 2018 at 12:11

4 votes

1 answer

142 views

Finding minimum value of $\sum a_ib_i$

asked May 3, 2018 at 7:58

3 votes

4 answers

416 views

Proving $f'(0)=0$ if $\lim_{x\to0}f(x)/x^2$ exists and is finite

asked May 3, 2018 at 6:29

3 votes

3 answers

133 views

Proving there exists $k$ such that $p(n)p(n+1)=p(k)$

asked May 29, 2018 at 8:37

3 votes

5 answers

134 views

Proving $k^k>(k+1)^{k-1}$

asked Jun 7, 2018 at 14:27

3 votes

4 answers

81 views

Prove $n$ is prime. (Fermat's little theorem probably)

asked Apr 25, 2018 at 12:48

3 votes

1 answer

125 views

Computing Minima for degree 8 polynomial [duplicate]

asked Apr 12, 2018 at 11:30

3 votes

2 answers

72 views

Ignoring $\frac1n$ in Riemann Sum

asked Apr 29, 2018 at 8:50

3 votes

3 answers

170 views

Trigonometric limit mistake

asked Jan 4, 2018 at 14:28

3 votes

2 answers

60 views

Mistake in converting Riemann Sum

asked Feb 14, 2018 at 17:05

3 votes

1 answer

103 views

possibly found a "counterexample" to a multilinear algebra problem

asked May 24, 2019 at 17:41

3 votes

0 answers

42 views

Non tangent through conic passes through two points

asked Aug 20, 2019 at 18:12

3 votes

1 answer

121 views

Trying to understand a solution to Project Euler #2

asked Mar 16, 2020 at 7:29

3 votes

1 answer

113 views

$y$ is a transient state then $\rho_{xy} \le \rho_{yy}$

asked Sep 28, 2020 at 10:15

2 votes

1 answer

236 views

General Case of Weyl's Equidistribution Theorem

asked Jun 8, 2020 at 19:31

2 votes

1 answer

40 views

Avg Area of triangle

asked Jun 15, 2018 at 7:44

2 votes

1 answer

101 views

Number of Unique Necklaces upto Rotation AND Reflection

asked Dec 21, 2019 at 14:09

Stack Exchange Network

132 Questions

Calculating a limit with trigonometric and quadratic function

Binomial summation $\sum\binom nkk^2$

Number of solutions to $1/x+1/y=1/1995$ in $\mathbb N^2$ [duplicate]

Multiplying congruences.

Integral part of sum of huge powers

Find positive $K$ such that $\int_0^\infty\left(\frac{1}{\sqrt{2x^2+1}}-\frac{K}{x+1}\right)dx$ converges

Minimum number of lattice points required so that there exists three points whose mean is also a lattice point

Prove that $\lim_{x\to\infty}\sum_{n=1}^{\infty}\frac x{n^2+x^2}$ exists and is positive

Given $G,H_1,H_2$ finite abelian groups and $G\times H_1 \cong G\times H_2$ then $H_1 \cong H_2$ [duplicate]

Infinite product with non homogenous recurrence relation

Is $\int_{-2}^3\frac{1}{x^3}dx=\frac5{72}$ or not defined?

Every prime number has multiple of form $100\dots01$

Calculate $\sum\limits_{k=0}^{20}(-1)^k\binom{k+2}2$ without calculating each term separately

Draw a perpendicular to diameter with only a straight edge

Finding minimum value of $\sum a_ib_i$

Proving $f'(0)=0$ if $\lim_{x\to0}f(x)/x^2$ exists and is finite

Proving there exists $k$ such that $p(n)p(n+1)=p(k)$

Proving $k^k>(k+1)^{k-1}$

Prove $n$ is prime. (Fermat's little theorem probably)

Computing Minima for degree 8 polynomial [duplicate]

Ignoring $\frac1n$ in Riemann Sum

Trigonometric limit mistake

Mistake in converting Riemann Sum

possibly found a "counterexample" to a multilinear algebra problem

Non tangent through conic passes through two points

Trying to understand a solution to Project Euler #2

$y$ is a transient state then $\rho_{xy} \le \rho_{yy}$

General Case of Weyl's Equidistribution Theorem

Avg Area of triangle

Number of Unique Necklaces upto Rotation AND Reflection