Smooth monoid #
A smooth monoid is a monoid that is also a smooth manifold, in which multiplication is a smooth map
of the product manifold G Γ G into G.
In this file we define the basic structures to talk about smooth monoids: SmoothMul and its
additive counterpart SmoothAdd. These structures are general enough to also talk about smooth
semigroups.
Basic hypothesis to talk about a smooth (Lie) additive monoid or a smooth additive
semigroup. A smooth additive monoid over Ξ±, for example, is obtained by requiring both the
instances AddMonoid Ξ± and SmoothAdd Ξ±.
- compatible : β {e e' : PartialHomeomorph G H}, e β atlas H G β e' β atlas H G β PartialHomeomorph.trans (PartialHomeomorph.symm e) e' β contDiffGroupoid β€ I
- smooth_add : Smooth (ModelWithCorners.prod I I) I fun (p : G Γ G) => p.1 + p.2
Instances
Basic hypothesis to talk about a smooth (Lie) monoid or a smooth semigroup.
A smooth monoid over G, for example, is obtained by requiring both the instances Monoid G
and SmoothMul I G.
- compatible : β {e e' : PartialHomeomorph G H}, e β atlas H G β e' β atlas H G β PartialHomeomorph.trans (PartialHomeomorph.symm e) e' β contDiffGroupoid β€ I
- smooth_mul : Smooth (ModelWithCorners.prod I I) I fun (p : G Γ G) => p.1 * p.2
Instances
If the addition is smooth, then it is continuous. This is not an instance for technical reasons, see note [Design choices about smooth algebraic structures].
If the multiplication is smooth, then it is continuous. This is not an instance for technical reasons, see note [Design choices about smooth algebraic structures].
Left multiplication by g. It is meant to mimic the usual notation in Lie groups.
Lemmas involving smoothLeftMul with the notation π³ usually use L instead of π³ in the
names.
Equations
- smoothLeftMul I g = { val := leftMul g, property := β― }
Instances For
Right multiplication by g. It is meant to mimic the usual notation in Lie groups.
Lemmas involving smoothRightMul with the notation πΉ usually use R instead of πΉ in the
names.
Equations
- smoothRightMul I g = { val := rightMul g, property := β― }
Instances For
Equations
- LieGroup.Β«termπ³Β» = Lean.ParserDescr.node `LieGroup.termπ³ 1024 (Lean.ParserDescr.symbol "π³")
Instances For
Equations
- LieGroup.Β«termπΉΒ» = Lean.ParserDescr.node `LieGroup.termπΉ 1024 (Lean.ParserDescr.symbol "πΉ")
Instances For
Equations
- β― = β―
Equations
- β― = β―
Morphism of additive smooth monoids.
Instances For
Morphism of smooth monoids.
Instances For
Equations
- instZeroSmoothAddMonoidMorphism = { zero := { toAddMonoidHom := 0, smooth_toFun := β― } }
Equations
- instOneSmoothMonoidMorphism = { one := { toMonoidHom := 1, smooth_toFun := β― } }
Equations
- instInhabitedSmoothAddMonoidMorphism = { default := 0 }
Equations
- instInhabitedSmoothMonoidMorphism = { default := 1 }
Equations
- instFunLikeSmoothAddMonoidMorphism = { coe := fun (a : SmoothAddMonoidMorphism I I' G G') => a.toFun, coe_injective' := β― }
Equations
- instFunLikeSmoothMonoidMorphism = { coe := fun (a : SmoothMonoidMorphism I I' G G') => a.toFun, coe_injective' := β― }
Equations
- β― = β―
Equations
- β― = β―
Equations
- β― = β―
Equations
- β― = β―
Differentiability of finite point-wise sums and products #
Finite point-wise products (resp. sums) of differentiable/smooth functions M β G (at x/on s)
into a commutative monoid G are differentiable/smooth at x/on s.
Equations
- β― = β―
Instances For
Equations
- β― = β―