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LetAbe a commutative ring andDbe a derivation ofAinto itself. If there exists a homomorphismE:A→A[[t]]such thatthen we say thatDis integrable. Integrable derivations have many good properties. In fact, most of unpleasant phenomena of derivations in characteristicpdisappear if we consider integrable derivations only.doi:10.1017/s002776300002002x fatcat:4quhopokpvexdb6flveln4tad4