[Merged by Bors] - feat(model_theory/substructures): More operations on substructures #11906
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…11906) Defines the substructure `first_order.language.hom.range`. Defines the homomorphisms `first_order.language.hom.dom_restrict` and `first_order.language.hom.cod_restrict`, and the embeddings `first_order.language.embedding.dom_restrict`, `first_order.language.embedding.cod_restrict` which restrict the domain or codomain of a first-order hom or embedding to a substructure. Defines the embedding `first_order.language.substructure.inclusion` between nested substructures.
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Defines the substructure
first_order.language.hom.range.Defines the homomorphisms
first_order.language.hom.dom_restrictandfirst_order.language.hom.cod_restrict, and the embeddingsfirst_order.language.embedding.dom_restrict,first_order.language.embedding.cod_restrictwhich restrict the domain or codomain of a first-order hom or embedding to a substructure.Defines the embedding
first_order.language.substructure.inclusionbetween nested substructures.