Abstract
In Shampine [7] it is shown how to obtain variational error bounds for approximate solutions of boundary value problems for semilinear ordinary differential equations. These bounds are depending on a certain constantK, the existence of which is assumed. Our paper aims at practical computation; in order to get applicableL ?-error bounds,K has to be computed explicitly. Using Garding's inequality, we obtainK=K(?) depending on a positive parameter ?. In order to make these bounds efficient,K(?) will be optimized. In application only the maximal zeros of three polynomials have to be computed. Some numerical examples are given to compare the error bounds with the actual errors.
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