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la flaca
  • Member for 8 years, 7 months
  • Last seen more than 1 year ago
  • Montevideo, Uruguay
14 votes
1 answer
2k views

Trying to understand how a subnet of a sequence differs from a subsequence [duplicate]

7 votes
2 answers
715 views

Does the converse of the chain rule hold in general?

6 votes
4 answers
2k views

Trying to understand the sum of ordinals

5 votes
4 answers
764 views

In what sense is $S^n$ contractible in $S^{n+1}$?

4 votes
1 answer
463 views

A connected, but not path-connected, space whose fundamental group depends on the basepoint

4 votes
1 answer
368 views

Proving an operator is nilpotent [duplicate]

4 votes
2 answers
529 views

Does every finite dimensional real vector space have a canonical basis?

4 votes
2 answers
570 views

Prove that for an open and continuous map $f:X \to Y$ between topological spaces, it is $f(\tau_X)=\tau_Y$

4 votes
1 answer
263 views

How does Cauchy-Schwarz imply Hölder inthe special case $p=q=2$?

3 votes
1 answer
509 views

Is this hypothesis necessary for Fubini's theorem (simple version for Riemann integrals)

3 votes
1 answer
177 views

Is the continuity of measures a topological continuity?

3 votes
1 answer
61 views

Clarification for the meaning of arc lenght and area forms

3 votes
0 answers
978 views

Alternative proof of Schwarz's theorem using Fubini's theorem

3 votes
2 answers
397 views

Proving a quadratic form is well defined

3 votes
1 answer
1k views

Why do we use the supremum instead of maximum to define the norm of a matrix?

3 votes
1 answer
675 views

Is Taylor polynomial of a function around a point $a$ the limit of an orthogonal projection of that function?

3 votes
1 answer
1k views

How to prove equivalence of definitions for matrix similarity

3 votes
1 answer
251 views

Trying to prove Cantor-Bernstein-Schröder following these steps

3 votes
1 answer
273 views

Confussion about substitution use and free variables requirement for rules of inference in natural deduction

3 votes
1 answer
955 views

Why is an operator composed with its adjoint positive and stricly positive when it's invertible?

3 votes
1 answer
3k views

Proving delta dirac properties

2 votes
0 answers
31 views

Is there a name for the relation of a directed set?

2 votes
0 answers
676 views

Necessary and sufficient condition for a linear operator to be invertible

2 votes
1 answer
369 views

Stuck at one step on the proof of distributive law of implication over disjunction

2 votes
1 answer
146 views

About the comparison test

2 votes
3 answers
149 views

If $f: \mathbb{R}^2 \to \mathbb{R}$ is a $C^1$ function, then $f$ is not bijective

2 votes
1 answer
446 views

Does a convergent sequence of norms of a vector space always converge to a norm?

2 votes
1 answer
54 views

Difficulties on proving the continuity part of a homeomorphism

2 votes
0 answers
316 views

Using the chain rule to find the derivative of the inverse of a function

2 votes
1 answer
648 views

Is it possible to have a norm in a vector space and a vector whose norm is smaller than the absolute value of one of its coordinates?