Here we construct universes for the groupoid natural model.
The natural model that acts as the ambient model in which the other universes live. Note that unlike the other universes this is not representable, but enjoys having representable fibers that land in itself.
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The natural model that acts as the classifier of v
-large terms and types.
Note that unlike GroupoidNaturalModel.base
this is representable,
but since representables are max u (v+1)
-large,
its representable fibers can be larger than itself.
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The groupoid natural model with three nested representable universes within the ambient natural model.
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- GroupoidModel.uHomSeq = { length := 3, objs := GroupoidModel.uHomSeqObjs, homSucc' := GroupoidModel.uHomSeqHomSucc' }
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A specialization of the polynomial universal property to the natural model base
The polynomial functor on tp
taken at yonedaCat.obj C
P_tp(yonedaCat C)
takes a groupoid Γ
to a pair of functors A
and B
B
C ⇇ Groupoidal A ⥤ PGrpd
⇊ ⇊
Γ ⥤ Grpd
A
As a special case, if C
is taken to be Grpd
,
then this is how P_tp(Ty)
classifies dependent pairs.
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A specialization of the universal property of UvPoly.compDom
to the natural model base
.
This consists of a pair of dependent types
A = α ⋙ forgetToGrpd
and B
,
a : A
captured by α
,
and b : B[a / x] = β ⋙ forgetToGrpd
caputred by β
.
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