mathlib
0e2aab2b - feat(data/matrix/basic): more lemmas about submatrix (#18738)

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2 years ago
feat(data/matrix/basic): more lemmas about submatrix (#18738) This adds trivial results about reordering rows and columns in a matrix: * Reordering can be moved around `dot_product`, `mul_vec`, and `vec_mul` (previouly we only had `mul`) * Reordering can be moved through `adjugate` * Reordering can be moved through row and column updates. * Reordering can be moved through `to_lin'` * Reordering does not affect `matrix.rank` Also adds some missing `of` wrappers. Lemmas about reindexing are useful when working with block matrices, as they make it possible to make symmetry arguments.
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