Geodesic
On the dependence of the orthogonal projector on deformations of the scalar product
Studia Mathematica, Tome 128 (1998) no. 1, pp. 1-17

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We consider scalar products on a given Hilbert space parametrized by bounded positive and invertible operators defined on this space, and orthogonal projectors onto a fixed closed subspace of the initial Hilbert space corresponding to these scalar products. We show that the projector is an analytic function of the scalar product, we give the explicit formula for its Taylor expansion, and we prove some algebraic formulas for projectors.
DOI : 10.4064/sm-128-1-1-17
Keywords: scalar product, orthogonal projector, dependence of projectors on scalar products

Zbigniew Pasternak-Winiarski 1

1 
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Zbigniew Pasternak-Winiarski. On the dependence of the orthogonal projector on deformations of the scalar product. Studia Mathematica, Tome 128 (1998) no. 1, pp. 1-17. doi: 10.4064/sm-128-1-1-17

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