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New posts in groupoids
Is there a "natural" / "categorical" definition of the "parity" of a permutation?
soft-question
category-theory
permutations
groupoids
definition of a groupoid
abstract-algebra
algebraic-topology
category-theory
groupoids
How are groupoids richer structures than sets of groups?
group-theory
soft-question
category-theory
groupoids
Which of these constructions are left adjoints?
category-theory
order-theory
monoid
groupoids
Statement about Homotopy in Brown's "Topology & Groupoids"
general-topology
algebraic-topology
homotopy-theory
groupoids
A comparison between the fundamental groupoid and the fundamental group
general-topology
algebraic-topology
examples-counterexamples
groupoids
covering spaces and the fundamental groupoid
algebraic-topology
covering-spaces
groupoids
Does May's version of groupoid Seifert-van Kampen need path connectivity as a hypothesis?
algebraic-topology
category-theory
groupoids
What are the ramifications of the fact that the first homotopy group can be non-commutative, whilst the higher homotopy groups can't be?
algebraic-topology
homotopy-theory
groupoids
Existence of a certain functor $F:\mathrm{Grpd}\rightarrow\mathrm{Grp}$
group-theory
category-theory
groupoids
Categorification of $\pi$?
number-theory
category-theory
groupoids
Purely combinatorial proof that$ (e^x)' = e^x$
combinatorics
groupoids
What structure does the alternating group preserve?
combinatorics
group-theory
category-theory
groupoids
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