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Mathlib.RingTheory.Finiteness.Lattice

Finite suprema of finite modules #

instance Submodule.finite_iSup {R : Type u_2} {V : Type u_3} [Ring R] [AddCommGroup V] [Module R V] {ι : Sort u_1} [Finite ι] (S : ιSubmodule R V) [∀ (i : ι), Module.Finite R (S i)] :
Module.Finite R (⨆ (i : ι), S i)

The submodule generated by a supremum of finite dimensional submodules, indexed by a finite sort is finite-dimensional.