48

Answers
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17
Sexy vacuity …
13
Abstract Thought vs Calculation
28
Why are matrices ubiquitous but hypermatrices rare?
4
Can we prove set theory is consistent?
7
Geometric intuition for limits
12
Can we have A={A} ?
7
Non-examples of model structures, that fail for subtle/surprising reasons?
2
What is an intuitive view of adjoints? (version 1: category theory)
2
What do people mean by “subcategory”?
9
compact-open topology
3
What happens when we print the digits of a real number?
4
Game involving ‘asking questions about a real’
2
Simplicial complexes vs. geometric realization of abstract simplicial complexes
6
Axiom of Replacement in Category Theory
1
Topos theory reference suitable for undergraduates
4
Deformations and the dual numbers
1
Rings with right inverses
16
Is there a “disjoint union” sigma algebra?
1
Subtler than meets the eye: does x=y imply forall x forall y x=y?
3
An elementary question about adjunctions between presheaf categories preserving pullbacks.
5
Are the axioms for higher category-theory effectively computable?
4
Describing global sections of sheafifications
8
Indecomposable objects in a category
3
Does this concept have a name, and what are some of its applications?
5
Joins of simplicial sets
1
The effective topos - by Hyland
5
“classes” with no cardinality; “classes” with no equality notion
2
Strict ordering on natural numbers
4
Left/right exact functor “in nature” which is not a right/left adjoint
12
Simple adjective for “of the size of a proper class”?
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