>>>>> "Adam" == Adam <adammaj1 at o2.pl> writes: Adam> Hi, Adam> What is the best method to find multiplicity of the root ? Adam> For example equation : Adam> z^4-z=z Doesn't this have 4 distinct roots? Anyway, the variable multiplicities is supposed to have the multiplicities. solve(z^3*(z-1)) -> [z = 0, z = 1] multiplicities -> [3, 1] Ray