Least squares are now hexagons
Least squares revisited
Everything you always wanted to know about the special CNES/Stellar Space Studies Singular Value Decomposition technique for gravity field inversion, with all the mathematical formulas. From traditional least squares to diagonalization of normal matrices to truncation of eigenvalues. This is the missing link to those three articles: Focusing efforts in the right direction (eigenvectors) Part 1 & Part 2, and Gravity field and the Cullinan Diamond, with detailed mathematical references.
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Least squares revisited
