Kritiker der Elche's user avatar
Kritiker der Elche's user avatar
Kritiker der Elche's user avatar
Kritiker der Elche
  • Member for 3 years
  • Last seen this week
9 votes
2 answers
658 views

Matrices with a more general indexing than by integers

6 votes
1 answer
314 views

Doubts on roster notation of sets

5 votes
1 answer
93 views

Isomorphism of products in a category: Does it involve the axiom of choice?

5 votes
2 answers
383 views

Different definitions of the tangent space at a point of a smooth manifold: Biduals?

4 votes
1 answer
165 views

Do the constant functions from a proper class to a set form a set?

4 votes
1 answer
187 views

Alternative concepts for tangent spaces of smooth manifolds and derivatives of smooth maps

4 votes
0 answers
102 views

Using the van Kampen theorem to compute the fundamental group of a wedge $X \vee Y$

3 votes
1 answer
123 views

In category theory, does a definition via a universal property induce a functor?

3 votes
2 answers
497 views

Use of the phrase "tangent vector of a curve"

2 votes
2 answers
127 views

Maps into spaces containing a copy of the closed topologist's sine curve

2 votes
1 answer
91 views

Tangent vectors of smooth manifolds as "modified" derivations?

2 votes
1 answer
171 views

The derivative of a smooth map between smooth submanifolds of Euclidean spaces: Is it a best linear approximation?

2 votes
1 answer
231 views

Uncertainty about the concept of "product" in category theory

1 vote
1 answer
74 views

Sections of holomorphic functions

1 vote
0 answers
18 views

Embedding a vector space in its bidual and the axiom of choice [duplicate]

1 vote
0 answers
76 views

Why are the morphism sets in a category required to be pairwise disjoint? [duplicate]

1 vote
1 answer
148 views

Are there internal direct products of vector spaces?

1 vote
0 answers
52 views

Comparing the derivatives of smooth maps $f, g : M\to N$ at $p \in M$ with $f(p) \ne g(p)$

1 vote
0 answers
47 views

Associativity of the Cartesian product of sets

1 vote
1 answer
437 views

Definition of differentiability for multivariable functions

1 vote
2 answers
44 views

Generalized directional derivatives