User cherry8.8vanilla - Mathematics Stack Exchange

cherry8.8vanilla

Member for 9 years, 8 months
Last seen more than 8 years ago

13 Questions

Score Activity Newest Views

4 votes

2 answers

387 views

Arithmetic sequence and a rectangular triangle

asked Sep 30, 2013 at 14:40

3 votes

2 answers

105 views

An exponential inequallity $2^x > 1-x$

asked May 24, 2014 at 11:35

3 votes

6 answers

596 views

Show that $7\mid(3^{2n+1}+2^{n+2})$ for all $n\in\mathbb{N}$ [duplicate]

asked May 26, 2014 at 15:24

2 votes

1 answer

199 views

Extremal problem

asked Nov 23, 2013 at 22:36

2 votes

3 answers

83 views

How to prove that $\frac{a^n}{a^m}$ is equal to $a^{n-m}$? [closed]

asked Jun 10, 2014 at 12:56

1 vote

1 answer

944 views

Maximizing the volume of the box obtained by folding the flaps after cutting out squares from each corner of a square

asked Nov 24, 2013 at 15:54

0 votes

4 answers

61 views

How to get from $-1\le\frac{1}{2a}\le1$ this $-1\ge2a\ge1 $?

asked May 21, 2014 at 16:27

0 votes

1 answer

145 views

A limit to infinity

asked Oct 9, 2013 at 15:48

0 votes

2 answers

42 views

Task with local extreme

asked Nov 23, 2013 at 21:36

0 votes

1 answer

37 views

$|2- (\sqrt{n^2+4n} - n)| ≥ \frac{1}{10}$

asked Jun 4, 2014 at 7:55

0 votes

3 answers

207 views

Set question - $ ℤ^+ = ℕ$ [duplicate]

asked May 24, 2014 at 14:47

0 votes

1 answer

240 views

A limit to infinity with four different roots: $\lim_{n \to \infty} \frac{\sqrt{n}+ \sqrt[4]{n^2+n}}{\sqrt[6]{n^3-1}+\sqrt[3]{n+2}}$

asked Sep 29, 2013 at 19:46

-1 votes

1 answer

459 views

Draw a set of values in complex plane where the complex number $w=1-3i$ is pure imaginary number.

asked Jun 7, 2014 at 11:45