Séminaire du 28 novembre 2011, 14h00: Clemens
Raab, Research Institute for Symbolic Computation, Linz,
Austria.
Symbolic Integration in Differential Fields.
The problem of computing integrals can be approached in many
ways. We consider the setting where functions are represented as elements
of appropriate differential fields and an antiderivative in an elementary
extension of that field is sought. In 1969 Risch gave an algorithm for
elementary integrands, which later has been extended to (transcendental)
Liouvillian integrands. In this talk we present a recent extension of that
algorithm to a certain class of non-Liouvillian functions. These
algorithms can also be applied naturally to compute definite integrals via
a differential analogue of creative telescoping. We will also discuss
related problems and give examples.
Virginie Collette
Last modified: Tue Nov 29 17:50:07 CET 2011