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Published online by Cambridge University Press: 20 November 2018
A Hilbert space, whose elements are entire functions, is of particular interest if it has these properties:
(H1) Whenever F(z) is in the space and has a non-real zero w, the function is in the space and has the same norm as F(z).
(H2) For each non-real number w, the linear functional defined on the space by F(z) —> F(w) is continuous.
(H3) Whenever F(z) is in the space, is in the space and has the same norm as F(z). If E(z) is an entire function satisfying