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cherry8.8vanilla
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4 votes
2 answers
398 views

Arithmetic sequence and a rectangular triangle

3 votes
2 answers
105 views

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

3 votes
6 answers
706 views

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

3 votes
3 answers
84 views

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

2 votes
1 answer
199 views

Extremal problem

1 vote
1 answer
1k views

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

0 votes
4 answers
61 views

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

0 votes
1 answer
150 views

A limit to infinity

0 votes
2 answers
43 views

Task with local extreme

0 votes
1 answer
43 views

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

0 votes
3 answers
219 views

Set question - $ ℤ^+ = ℕ$ [duplicate]

0 votes
1 answer
272 views

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

-1 votes
1 answer
460 views

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