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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, 2 months
  • Last seen this week
9 votes
2 answers
687 views

Matrices with a more general indexing than by integers

6 votes
1 answer
326 views

Doubts on roster notation of sets

5 votes
1 answer
94 views

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

5 votes
2 answers
396 views

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

4 votes
1 answer
168 views

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

4 votes
0 answers
111 views

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

4 votes
2 answers
519 views

Use of the phrase "tangent vector of a curve"

4 votes
1 answer
194 views

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

3 votes
1 answer
124 views

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

2 votes
2 answers
127 views

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

2 votes
1 answer
92 views

Tangent vectors of smooth manifolds as "modified" derivations?

2 votes
1 answer
180 views

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

2 votes
1 answer
254 views

Uncertainty about the concept of "product" in category theory

1 vote
1 answer
75 views

Sections of holomorphic functions

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
49 views

Associativity of the Cartesian product of sets

1 vote
1 answer
456 views

Definition of differentiability for multivariable functions

1 vote
2 answers
45 views

Generalized directional derivatives

1 vote
1 answer
160 views

Are there internal direct products of vector spaces?

1 vote
0 answers
18 views

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

1 vote
0 answers
79 views

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