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Heidegger
  • Member for 6 years, 2 months
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  • North England
10 votes
1 answer
254 views

For which values of the parameter, $f(x, y)$ is differentiable at $(0, 0)$?

8 votes
2 answers
195 views

Clarification about solving cubic equations

7 votes
2 answers
307 views

Continuity of a multivariable function: doubts on how to reason

5 votes
2 answers
159 views

$f(x, y, z)$ with both $\leq$ and $=$ constraints. General questions.

5 votes
2 answers
252 views

$L^1_{\text{loc}}$, Frechet Space and norm-distance

5 votes
4 answers
552 views

Doubts: continuity VS existence of the limit

5 votes
1 answer
245 views

Find the max of this function

4 votes
3 answers
575 views

About the domain of the derivative

4 votes
2 answers
174 views

Unfriendly function to study

4 votes
2 answers
244 views

Does the limit $\lim_{x\to 0} \sqrt{x^3 - x^2}$ exist or not?

4 votes
5 answers
449 views

Complex Analysis to solve this integral? $\int_0^{\pi/2} \frac{\ln(\sin(x))}{\sqrt{1 + \cos^2(x)}}\text{d}x$

4 votes
1 answer
100 views

Should we write $\lim_\limits{x\to -\infty} \frac{3x^2-1}{x^3+4x+3}=0^-$ instead of just $0$?

4 votes
2 answers
90 views

Convergence of $\sum_{n =0}^{+\infty} \frac{3^n}{n!}$ with geometric progression

4 votes
1 answer
71 views

A problem on compositions of functions

4 votes
1 answer
129 views

Exercise about convex function

3 votes
1 answer
48 views

Really dumb clarification on logarithm domain.

3 votes
2 answers
65 views

Is this function differentiable on $\mathbb{R}$?

3 votes
0 answers
31 views

Error in the notes about even/odd function?

3 votes
1 answer
43 views

Help with the study of the function $f(x) = \frac{-2}{5x-\ln\vert x \vert}$

3 votes
1 answer
89 views

Differentiable function: where am I wrong?

3 votes
3 answers
77 views

Is it possible to explicitly determine max and min in this case?

3 votes
3 answers
69 views

Understanding this passage in Borel Cantelli Lemma N.2

3 votes
1 answer
82 views

About the equivalence of $\cos(x) = \sqrt{1-\sin^2(x)}$ and $\cos(x) = \cos(2x-x)$

3 votes
1 answer
155 views

Troubles with a degenerate conics

3 votes
1 answer
81 views

How to prove this is an isomorphism?

3 votes
3 answers
167 views

About the continuity of the partial derivative

3 votes
1 answer
51 views

Max and min of a three variable function over a set

3 votes
0 answers
44 views

Unclear result of inequality with absolute value

2 votes
2 answers
40 views

Doubt on the differentiability of this function over $\mathbb{R}$

2 votes
1 answer
70 views

What's the difference between working in $\mathbb{R}$ and in $\mathbb{Q}$ in this exercise?

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