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Noix07's user avatar
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Noix07
  • Member for 10 years, 9 months
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32 votes
2 answers
10k views

"Abstract nonsense" proof of the splitting lemma

9 votes
1 answer
2k views

equivalent? algebraic definition of a partial isometry in a C*-algebra

8 votes
4 answers
3k views

Infinite coproduct of abelian groups

7 votes
1 answer
896 views

Foundation of category theory

7 votes
2 answers
994 views

Projective (or inverse) limit of C*-algebras

6 votes
0 answers
685 views

Are projective limits always subobjects of a product and dualy, inductive limits quotient objects of a coproduct?

6 votes
2 answers
713 views

What would be the equivalent of the "gluing axiom" for a cosheaf

4 votes
2 answers
547 views

English for "prolongement" or "Fortsetzung"?

4 votes
2 answers
417 views

Detail in the algebraic proof of the polar decomposition

4 votes
1 answer
343 views

Arveson spectrum for a unitary representation of a group on a Hilbert space

4 votes
1 answer
382 views

"Equivalent" definitions of the gluing axioms

3 votes
1 answer
158 views

Confusion about a factor in a composition of series/Faa di Bruno formula

3 votes
1 answer
140 views

A specific "gaussian" integral

3 votes
1 answer
344 views

Universal property for a subgroup (or a suboject) generated by a subset

3 votes
2 answers
375 views

Equality of the Schläfli's integrals

3 votes
0 answers
149 views

Confusion about the Jordan-Chevalley/Dunford decomposition in $\mathbb{R}$, example of a rotation (solved!!!)

3 votes
2 answers
62 views

What's the name of this basic formula

3 votes
1 answer
153 views

Extension of a uniformly continuous function, quibble

3 votes
0 answers
125 views

Show that the "folium" is norm closed

2 votes
1 answer
545 views

Alternative proof that the half space $H^n$ is not homeomorphic to $\mathbb{R}^n$

2 votes
1 answer
635 views

Detail of a proof about about trace-zero functions in $W^{1,p}$, Thm 2 p.273 in L. Evans' PDE

2 votes
0 answers
142 views

Why does one only consider one-parameter groups in Borchers-Arveson theorem?

2 votes
0 answers
338 views

Subbase for a topology defined by a family of closed sets?

2 votes
1 answer
2k views

Relation between direct sum and tensor product

2 votes
2 answers
262 views

Motivation for introducing von Neumann algebra in addition to $C^*$algebra

2 votes
1 answer
250 views

Integration on a submanifold parametrized as the level set of a submersion

2 votes
2 answers
110 views

Can the following expression be related to the multinomial formula?

2 votes
0 answers
276 views

Detail in the Fredholm alternative: necessity to prove $\operatorname{codim}\operatorname{Im}(I-K) = \operatorname{dim}\operatorname{Ker}(I-K)$

2 votes
0 answers
248 views

Complex ($\mathbb{C}$) version of the global Cauchy-Lipschitz (=Picard-Lindelöf) theorem?

2 votes
1 answer
53 views

A specific change of variable, similar to spherical coordinates