Geodesic
Steepest Descent and Least Squares Solvability
Canadian mathematical bulletin, Tome 17 (1974) no. 2, pp. 275-276

Voir la notice de l'article provenant de la source Cambridge University Press

Let T be a bounded linear operator defined on a Hilbert space H. An element z∈H is called a least squares solution of the equation if . It is easily shown that z is a least squares solution of (1) if and only if z satisfies the normal equation 
Groetsch, C. W. Steepest Descent and Least Squares Solvability. Canadian mathematical bulletin, Tome 17 (1974) no. 2, pp. 275-276. doi: 10.4153/CMB-1974-053-7
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