Singular

D.15.3.5 diffAlgebraChangeOrd

Usage:

diffAlgebraChangeOrd(#); # list

Assume:

the current basering is the differential algebra

Return:

the differential algebra with changed monomial ordering

Note:

- an ordering is defined via the following pattern:
- #[i] = 'gen' defines the ordering on the generators dx_i - #[i+1] must then be a valid monomial ordering as string - #[i+2] an optional weight vector
- #[i] = 'ringvar' defines the ordering on the ringvariables - #[i+1] must then be a valid monomial ordering as string - #[i+2] an optional weight vector
- only use for interior computations
- differential forms are polynomials in the differential algebra - not in the returned ring - do not define differential forms as polynomials in the returned ring since this is another data-ring - an error occurs if: - no valid monomial ordering is given - no weight vector is given but a weighted monomial ordering - a given weight vector has wrong dimension
- weight vectors are ignored if the given ordering is not weighted