mathlib3

53c79d56 - feat(linear_algebra/span): add `finite_span_is_compact_element` (#13901)

feat(linear_algebra/span): add `finite_span_is_compact_element` (#13901) This PR adds `finite_span_is_compact_element`, which extends `singleton_span_is_compact_element` to the spans of finite subsets. This will be useful e.g. when proving the existence of a maximal submodule of a finitely generated module.