Arithmetic, Geometry, Cryptography and Coding Theory 2009
David Kohel, Robert Rolland · Contemporary mathematics - American Mathematical Society · 2010
In this note we present Hironaka's invariants as developed by Giraud: the ridge and the directrix. We give an effective definition and a functorial one and show their equivalence. The fruit is an effective algorithm that computes the additive generators of the "ridge", and the generators of its invariant algebra.