Abstract
In this chapter, we present two fundamental results about the operator-norm optimal error bound estimates for convergence rate of the Trotter-Kato product formul for semigroups with noncommuting self-adjoint generators.
The ITTZ-Theorem (Sect. 7.1) shows that self-adjointness of the sum of a couple of generators, is a crucial condition for the operator-norm convergence of the Trotter-Kato product formul with the optimal error bound estimate for the rate of convergence.
The INZ-Theorem (Sect. 7.4) concerns the case when it is the form-sum of a couple of generators is self-adjoint. In Sect. 7.4 we establish dependence of the optimal operator-norm error bound estimate for convergence rate of the Trotter-Kato product formul on relations between fractional powers of the self-adjoint generators.
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Zagrebnov, V.A., Neidhardt, H., Ichinose, T. (2024). Trotter-Kato Product Formulae: Operator-Norm Topology and Error Bounds. In: Trotter-Kato Product Formulæ. Operator Theory: Advances and Applications, vol 296. Birkhäuser, Cham. https://doi.org/10.1007/978-3-031-56720-9_7
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