a rrank b array a; number b It computes the holonomic rank for regular holonomic system. For the algorithm, see Grobner deformations of hypergeometric differential equations, 1999, Springer. Chapter 2. Example 1 : [ [( (x Dx)^2 + ( y Dy)^2) ( x Dx y Dy -1)] (x,y)] rrank ::

Nobuki Takayama 2020-11-24