Filipovic, DamirTeichmann, J.2010-04-252010-04-252010-04-25200310.1016/S0022-1236(02)00029-0https://infoscience.epfl.ch/handle/20.500.14299/49689We show that a continuous local semiflow of Ck-maps on a finite- dimensional Ck-manifoldM can be embedded into a local Ck-flow on M under some weak (necessary) assumptions. This result is applied to an open problem in [2]. We prove that finite-dimensional realizations for interest rate models are highly regular objects, namely given by submanifolds M of D(A∞), where A is the generator of a strongly continuous semigrouptext::journal::journal article::research article