On Oct 22, 7:49 am, achrzesz <[email protected]> wrote: > On Oct 22, 4:57 am, Gary Church <[email protected]> wrote: > It seems that some special functions (erf, Fresnel,...?) have to be > used in the exact integration Indeed so - that's a consequence of Liouville's Principle, just as 'erf' is NEEDED to express exp(-x^2). See, e.g. Davenport/Siret/Tournier Computer Algebra/Calcul Formel, or Bronstein, Symbolic Integration I. James Davenport
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