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feat(linear_algebra/matrix): slightly generalize `smul_left_mul_matri…
…x` (#7632) Two minor changes that make `smul_left_mul_matrix` slightly easier to apply: * the bases `b` and `c` can now be indexed by different types * replace `(i, k)` on the LHS with `ik.1 ik.2` on the RHS (so you don't have to introduce the constructor with `rw ← prod.mk.eta` somewhere deep in your expression)
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