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Theorem main-lemma

⊦ r × c ∈ spmx ∧ c < # x ∧ r < # y → y[r, y[r] + spmx[r × c] * x[c]] + (spmx -- (r × c)).toMatrix(# y, # x) * x = y + spmx.toMatrix(# y, # x) * x

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