Abstract Let be a field of formal Laurent series with coefficients in finite characteristic $p$?> , G_{ the maximal quotient Galois group period and nilpotency class $ $\{\mathscr G_{ filtration by ramification subgroups upper numbering. G_{ identification nilpotent Artin-Schreier theory: here $G(\mathscr is obta...

Let X be a p-divisible group over a regular scheme S such that the Newton polygon in each geometric point of S is the same. Then there is a p-divisible group isogenous to X which has a slope filtration.