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math.NA2023
The Pseudoinverse of is (?)
Michał P. Karpowicz, Gilbert Strang
This paper gives three formulas for the pseudoinverse of a matrix product . The first is sometimes correct, the second is always correct, and the third is almost never corr…
math.NA2023
The secret life of matrix factorizations: how matrix decompositions reveal and keep secrets of linear equations and what we can do about it
Michał P. Karpowicz
This paper explores the relationship between matrix factorizations and linear matrix equations. It shows that every matrix factorization defines two hidden projectors, one for the…