Semigroup Forum - UT Math

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SEMIGROUPS AND COSINE FUNCTIONS* ... 1. INTRODUCTION. Let L be the generator of a uniformly bounded strongly continu- ... Banach space X. we denote by R (B) and K(B) the range and kernel, ... cosine function {c, t e R} on X. The corresponding sine function is ... First we note the simple fact that the set of x in x , for.

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