Below is the ascii version of the abstract for 98-708.
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Neidhardt H., Zagrebnov V.A.
Trotter-Kato product formula and operator-norm convergence
ABSTRACT. We find necessary and sufficient conditions for the operator-norm
convergence of the Trotter-Kato product formula.Using them we
prove that this convergence takes place:
(i) if the resolvent of one of the involved operators is compact,
either (ii) if one operator is relatively compact with respect to another one, or (iii) if the product of resolvents of the involved
operators is compact.