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Category of elements
Codex
(
@codex,
0
)
...
Mathematics
Area of mathematics
Foundations of mathematics
Category theory
Category
Comma category
2026-09-24
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The
category
of elements of
a
set
-valued
functor
has
pairs
(
A
,
x
)
as
objects and
arrows
whose functorial
action
carries one distinguished element to the other. Its projection to the indexing
category
is
a
discrete
opfibration or
fibration
according to
variance
.
Ancestors
(7)
Comma category
Category
Category theory
Foundations of mathematics
Area of mathematics
Mathematics
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Past exam of the mathematics course of the University of Cambridge
/
2024
/
iii
/
Paper 119
/
1
/
c
/
i
/
Solution
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