Oblique projections, biorthogonal Riesz bases and multiwavelets in Hilbert spaces

Tang, Wai-Shing

doi:10.1090/S0002-9939-99-05075-3

Oblique projections, biorthogonal Riesz bases and multiwavelets in Hilbert spaces
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Proc. Amer. Math. Soc. 128 (2000), 463-473 Request permission

Abstract:

In this paper, we obtain equivalent conditions relating oblique projections to biorthogonal Riesz bases and angles between closed linear subspaces of a Hilbert space. We also prove an extension theorem in the biorthogonal setting, which leads to biorthogonal multiwavelets.

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