Unfoldings of maps, the first results on stable maps, and results of Mather-Yau/Gaffney-Hauser type in arbitrary characteristic

Abstract: Consider the (formal/analytic/algebraic) map-germs Maps(X,(k^p,o)). Let G be the group of right/contact/left-right transformations. I extend the following (classical) results from the real/complex-analytic case to the case of arbitrary field k. * A separable unfolding is locally trivial iff it is infinitesimally trivial. * An unfolding is locally versal iff it is infinitesimally versal. * The criterion of factorization of map-germs in zero characteristic. * Criteria of trivialization of unfoldings over affine base. * Fibration of K-orbits into A-orbits. * A map is locally stable iff it is infinitesimally stable. * Stable maps are unfodings of their genotypes. * Stable maps are determined by their local algebras. * Results of Mather-Yau/Scherk/Gaffney-Hauser type. How does the module T^1_G f, or related algebras, determine the G-equivalence type of f?