The display of a formal p-divisible group

Abstract

Introduction We fix throughout a prime number p . Let R be a commutative unitary ring. Let W (R) be the ring of Witt vectors. The ring structure on W (R) is functorial in R and has the property that the Witt polynomials are ring homomorphisms: w n : W (R) \\Gamma! R (x 0 ; : : : x i ; : : : ) 7! x p n 0 + px p n\\Gamma1 1 + : : : + p n x n Let us denote the kernel of the homomorphism w 0 by I R . The Verschiebung is a homomorphism of additive groups: V : W (R) \\Gamma!<F63.