The display of a formal p-divisible group
We give a new Dieudonne theory which associates to a formal p-divisible group X over an excellent p-adic ring R an object of linear algebra called a display. On the display one can read off the structural equations for the Cartier module of X, and find the crystal of Grothendieck-Messing. We give applications to deformations of formal p-divisible groups.
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Société Mathématique de France