4.1: Least Squares - Mathematics LibreTexts
https://math.libretexts.org/Bookshelves/Linear_Algebra/Matrix_Analysis_(Cox)/04%3A_Least_Squares/4.01%3A_Least_Squares
WEBSep 17, 2022 · Introduction. We learned in the previous chapter that Ax = b need not possess a solution when the number of rows of A exceeds its rank, i.e., r < m. As this situation arises quite often in practice, typically in the guise of 'more equations than unknowns,' we establish a rationale for the absurdity Ax = b.
DA: 18 PA: 40 MOZ Rank: 31