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The devitrijication characteristics of Jive Na,O-SiO, glasses have been examined by a new method, and some empirical relationships, applicable over the range of compositions studied, have been established. Comparisons are made with results given in other published work.

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We show that if X is a reflexive Banach space, then a nonautonomous operator Riccati integral equation has a unique strongly continuous self-adjoint nonnegative solution P (t) ∈ L(X, X