Lie submodules of a Lie algebra #
In this file we define Lie submodules, we construct the lattice structure on Lie submodules and we use it to define various important operations, notably the Lie span of a subset of a Lie module.
Main definitions #
LieSubmoduleLieSubmodule.wellFounded_of_noetherianLieSubmodule.lieSpanLieSubmodule.mapLieSubmodule.comap
Tags #
lie algebra, lie submodule, lie ideal, lattice structure
A Lie submodule of a Lie module is a submodule that is closed under the Lie bracket. This is a sufficient condition for the subset itself to form a Lie module.
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The zero module is a Lie submodule of any Lie module.
Copy of a LieSubmodule with a new carrier equal to the old one. Useful to fix definitional
equalities.
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Given a Lie submodule N of a Lie module M over a Lie algebra L, and a Lie subalgebra
H ≤ L, N.restr H is the same submodule but viewed as a Lie submodule over H.
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Given a Lie subalgebra K ⊆ L, if we view L as a K-module by restriction, it contains
a distinguished Lie submodule for the action of K, namely K itself.
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The Lie submodules of a Lie module form a complete lattice.
The natural functor that forgets the action of L as an order embedding.
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The inclusion of a Lie submodule into its ambient space is a morphism of Lie modules.
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Given two nested Lie submodules N ⊆ N',
the inclusion N ↪ N' is a morphism of Lie modules.
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The lieSpan of a set s ⊆ M is the smallest Lie submodule of M that contains s.
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lieSpan forms a Galois insertion with the coercion from LieSubmodule to Set.
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An induction principle for span membership. If p holds for 0 and all elements of s, and is
preserved under addition, scalar multiplication and the Lie bracket, then p holds for all
elements of the Lie submodule spanned by s.
A morphism of Lie modules f : M → M' pushes forward Lie submodules of M to Lie submodules
of M'.
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A morphism of Lie modules f : M → M' pulls back Lie submodules of M' to Lie submodules of
M.
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An injective morphism of Lie modules embeds the lattice of submodules of the domain into that of the target.
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For an injective morphism of Lie modules, any Lie submodule is equivalent to its image.
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An equivalence of Lie modules yields an order-preserving equivalence of their lattices of Lie Submodules.
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The kernel of a morphism of Lie algebras, as an ideal in the domain.
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The range of a morphism of Lie modules f : M → N is a Lie submodule of N.
See Note [range copy pattern].
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A morphism of Lie modules f : M → N whose values lie in a Lie submodule P ⊆ N can be
restricted to a morphism of Lie modules M → P.
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The natural equivalence between the 'top' Lie submodule and the enclosing Lie module.
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The natural equivalence between the 'top' Lie subalgebra and the enclosing Lie algebra.
This is the Lie subalgebra version of Submodule.topEquiv.