Yoneda embedding of Mon C #
We show that monoid objects in Cartesian monoidal categories are exactly those whose yoneda presheaf
is a presheaf of monoids, by constructing the yoneda embedding Mon C β₯€ Cα΅α΅ β₯€ MonCat.{v} and
showing that it is fully faithful and its (essential) image is the representable functors.
Alias of CategoryTheory.Mon.uniqueHomToTrivial.
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Comm monoid objects are internal monoid objects #
A commutative monoid object is a monoid object in the category of monoid objects.
A commutative additive monoid object is an additive monoid object in the category of additive monoid objects.
A commutative monoid object is a commutative monoid object in the category of monoid objects.
A commutative additive monoid object is a commutative additive monoid object in the category of additive monoid objects.
If X represents a presheaf of monoids, then X is a monoid object.
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If X represents a presheaf of additive monoids, then X is an additive monoid object.
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If M is a monoid object, then Hom(X, M) has a monoid structure.
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If M is an additive monoid object, then Hom(X, M) has an additive monoid structure.
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Functor.map of a monoidal functor as a MonoidHom.
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Functor.map of a monoidal functor as a AddMonoidHom.
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Functor.map of a fully faithful monoidal functor as a MulEquiv.
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Functor.map of a fully faithful monoidal functor as a AddEquiv.
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If M is a commutative monoid object, then Hom(X, M) has a commutative monoid structure.
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If M is a commutative additive monoid object, then Hom(X, M) has a commutative additive
monoid structure.
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If M is a monoid object, then Hom(-, M) is a presheaf of monoids.
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If M is an additive monoid object, then Hom(-, M) is a presheaf of additive monoids.
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If X represents a presheaf of monoids F, then Hom(-, X) is isomorphic to F as
a presheaf of monoids.
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If X represents a presheaf of additive monoids F, then Hom(-, X) is isomorphic
to F as a presheaf of additive monoids.
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The yoneda embedding of Mon C into presheaves of monoids.
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The yoneda embedding of AddMon C into presheaves of additive monoids.
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If M is a monoid object, then Hom(-, M) as a presheaf of monoids is represented by M.
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If M is an additive monoid object, then Hom(-, M) as a presheaf of additive monoids
is represented by M.
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The yoneda embedding for Mon C is fully faithful.
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The yoneda embedding for AddMon C is fully faithful.
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If M and N are isomorphic as monoid objects, then X βΆ M and X βΆ N are isomorphic
monoids.
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If M and N are isomorphic as additive monoid objects, then X βΆ M and X βΆ N
are isomorphic additive monoids.
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A monoid object M is commutative if and only if X βΆ M is commutative for all X.