feat(linear_algebra/basis): repr_support_of_mem_span (#14504)
feat(linear_algebra/basis): repr_support_of_mem_span (#14504)

This lemma states that if a vector is in the span of a subset of the basis vectors, only this subset of basis vectors will be used in its `repr` representation.



Co-authored-by: Alexander Bentkamp <32d98551c79b684f1da0f92f7cdebc284b26b9ec@vu.nl>

leanprover-community/mathlib,leanprover-community/mathlib