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haqnatural
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3 votes
2 answers
350 views

The converges of $ \sqrt 2 +\sqrt { 2-\sqrt 2} +\sqrt { 2-\sqrt { 2+\sqrt 2} } + \cdots =$

2 votes
1 answer
213 views

Find integer solutions equation of ${ x }_{ 1 }^{ 4 }+{ { x }_{ 2 }^{ 4 }+ }{ x }_{ 3 }^{ 4 }+...+{ x }_{ 14 }^{ 4 }=1599 $

2 votes
1 answer
136 views

Big an open ball inside small open ball in metric space

2 votes
2 answers
133 views

How can I calculate this limit?

1 vote
1 answer
96 views

Need to prove continuous periodic function of $\varphi (x) \equiv \psi(x)$

1 vote
3 answers
98 views

Sum of possible all possible $x$ such that $51 \equiv 3 \pmod{x}$

1 vote
1 answer
99 views

Evaluation of the integral $\oint _{ C }^{ }{ \frac { 2{ z }^{ 2 }+5 }{ { \left( z+2 \right) }^{ 3 }\left( { z }^{ 2 }+4 \right) { z }^{ 2 } } dz } $

1 vote
1 answer
80 views

Finding the residue

1 vote
2 answers
73 views

What does the minimum x that satify $x=24n+12=15m+6=11k+2$?

0 votes
1 answer
43 views

How transform this integral to the "Cauchy's integral"

0 votes
1 answer
169 views

Changing the order of quantifiers in the definition of continuity of function

0 votes
1 answer
42 views

What is a exact answer of $\sum x$ if $3x+16 \equiv x+1 \pmod {x-3} \qquad x \in \mathbb{Z}^{+}$?

0 votes
2 answers
746 views

$\int { \max { \left( 1,{ x }^{ 2 } \right) dx } }$

-1 votes
1 answer
62 views

Proving limit of the sequence ${ x }_{ n+1 }=\frac { 1 }{ 3 } \left( 2{ x }_{ n }+\frac { a }{ { x }_{ n }^{ 2 } } \right) $