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7.7.5.0. appelF4
Procedure from library dmodapp.lib (see dmodapp_lib).

Usage:
appelF4();

Return:
ring (a parametric Weyl algebra) containing an ideal 'IAppel4'

Purpose:
defines the ideal in a parametric Weyl algebra,
which annihilates Appel F4 hypergeometric function

Note:
The output ring is a parametric Weyl algebra. It contains an ideal
'IAappel4' annihilating Appel F4 hypergeometric function.
See (SST) p. 39.

Example:
 
LIB "dmodapp.lib";
def A = appelF4();
setring A;
IAppel4;
==> IAppel4[1]=-x^2*Dx^2+x*Dx^2-2*x*y*Dx*Dy-y^2*Dy^2+(-a-b-1)*x*Dx+(c)*Dx+(-a\
   -b-1)*y*Dy+(-a*b)
==> IAppel4[2]=-x^2*Dx^2-2*x*y*Dx*Dy-y^2*Dy^2+y*Dy^2+(-a-b-1)*x*Dx+(-a-b-1)*y\
   *Dy+(d)*Dy+(-a*b)