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▹
Category theory
▹
Concrete categories
Definition 4.9.4.
Let
u
∈
ℕ
. We define:
PtSet
u
:
=
[
PtSet
(Hom(
A
,
B
))
A
,
B
∈
PtSet
(id
C
)
C
∈
PtSet
(∘)
D
,
E
,
F
∈
PtSet
]
u
is a/an
u
-small category
Remarks.
The objects of this category are actually isomorphism classes of pointed sets.
References.
https://en.wikipedia.org/wiki/Pointed_set
https://ncatlab.org/nlab/show/pointed+set
https://proofwiki.org/wiki/Category:Category_of_Pointed_Sets