Canonical bases of modules over one dimensional k-algebras

Let K be a field and denote by K[t], the polynomial ring with coefficients in K. Set A = K[f1,. … , fs], with f1,. … , fs $\in$ K[t]. We give a procedure to calculate the monoid of degrees of the K algebra M = F1A + $\times$ $\times$ $\times$ + FrA with F1,. … , Fr $\in$ K[t]. We show some applications to the problem of the classification of plane polynomial curves (that is, plane algebraic curves parametrized by polynomials) with respect to some oh their invariants, using the module of K{"a}hler differentials.