XExponentialPackage(R, VarSet, XPOLY)ΒΆ

xlpoly.spad line 381

This package provides computations of logarithms and exponentials for polynomials in non-commutative variables. Author: Michel Petitot (petitot@lifl.fr).

exp: (XPOLY, NonNegativeInteger) -> XPOLY
exp(p, n) returns the exponential of p truncated at order n.
Hausdorff: (XPOLY, XPOLY, NonNegativeInteger) -> XPOLY
Hausdorff(a, b, n) returns log(exp(a)*exp(b)) truncated at order n.
log: (XPOLY, NonNegativeInteger) -> XPOLY
log(p, n) returns the logarithm of p truncated at order n.