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Varazda
  • Member for 7 years, 6 months
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6 votes
4 answers
6k views

Verify the following limit using epsilon-delta definition: $ \lim_{(x,y)\to(0,0)}\frac{x^2y^2}{x^2+y^2}=0$

3 votes
2 answers
416 views

How to calculate this limit without L'Hopital rule?

3 votes
3 answers
431 views

Does this integral converge $\int_{\mathbb{R}^2}\frac{1}{x^4y^4+1}\ dxdy $?

3 votes
3 answers
215 views

How to properly describe or define symmetric (even) function in $\mathbb{R}^n$

2 votes
0 answers
196 views

Determine all integers (bigger than 1) such that $\frac{2^n+1}{n^2}$ is an integer [duplicate]

2 votes
1 answer
126 views

How to show that $ \sum_{k=1}^{2^n}\frac{1}{k}\geq 1+\frac{n}{2}$? [duplicate]

1 vote
3 answers
399 views

How to calculate this Dirac integral?

1 vote
3 answers
505 views

how to calculate the following expression?

1 vote
1 answer
69 views

How to solve this non-linear differential equation of 2nd order?

0 votes
3 answers
87 views

Find a function that satisfies $f(\sin(x))+f(\cos(x))=\left(\frac{2}{\sin(2x)}\right)^2$

0 votes
1 answer
97 views

Calculating the inverse function of $f(x)=1+x\cdot \ln(x)-\ln(x)^2$

0 votes
2 answers
145 views

Calculate the $n^{th}$ derivative of this functions?

0 votes
2 answers
106 views

How to "quickly" solve the following linear system of equations?

-2 votes
2 answers
359 views

Theorem of null integral?