In this note new Rosenbrock methods for ODEs, DAEs, PDEs and PDAEs of index 1 are presented. These solvers are of order 3, have 3 or 4 internal stages, and fulfil certain order conditions to obtain a better convergence if inexact Jacobians and approximations of ∂f ∂t are used. A comparison with other Rosenbrock solvers shows the advantages of the new methods. (2000): 34A09, 65L80.
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