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Sia un anello di caratteristica diseguale. Si stabiliscono formule generali per gli endomorfismi di una differenziazione o -iterativa di , con non zerodivisore di R. Tali formule sono note nel caso della caratteristica eguale.
Let be a field of positive characteristic . We study the coactions of the Hopf algebra of the multiplicative group with underlying algebra , , on a -algebra . We give the rule for the set of additive endomorphism of , that define a coaction of on commutative. For , we obtain the explicit expression of such coactions in terms of derivations of .
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