min_b Ab - y b = A^+ y where A^+ is the [pseudoinverse](https://en.wikipedia.org/wiki/Moore%E2%80%93Penrose_inverse) of A See *Introduction to algorithms* by *TH Cormen, CE Leiserson, RL Rivest, C Stein*.
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make-github-pseudonymous-again commentedon Feb 28, 2020
Superset of #21.