The terminology after Schwarz [2].2) Hille [1], Chap.XII, in p₃rticular Theorem 12.2.1;Yosida [3], Theorem 2. lntegration of the equation of evolution in a Banach space.209 $A(t)$ for each t .Thus it is convenient to introduce the following de- finition.DEFINITION 1.
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Tosio Kato (1953) studied this question.