The Macaulay2 package
Cremona.m2 performs some computations on rational and
birational maps between irreducible projective varieties. For instance, it provides
methods to compute degrees and projective degrees of rational maps without any
theoretical limitation, from which is derived a general method to compute the
push-forward to projective space of Segre classes. Moreover, the computations can be
done both deterministically and probabilistically. We give here a brief description of
the methods and algorithms implemented.
Keywords
rational map, birational map, projective degrees, Segre
class
