Abstract. In 1963 [Ann. of Math. 78, 267-288], Gerstenhaber invented a comp(osition) calculus in the Hochschild complex of an associative algebra. In this paper, the first steps of the Gerstenhaber theory are exposed in an abstract (comp system) setting. In particular, as in the Hochschild complex, a graded Lie algebra and a pre-coboundary operator can be associated to every comp system. A derivation deviation of the pre-coboundary operator over the total composition is calculated in two ways, (the long) one of which is essentially new and can be seen as an example and elaboration of the auxiliary variables method proposed by Gerstenhaber in the early days of the comp calculus.Classification. 18D50 (MSC2000).

We consider basic algebraic constructions associated with an abstract pre-operad, such as a -algebra, total composition •, precoboundary operator δ and tribraces {h, f, g}. A derivation deviation of the pre-coboundary operator over the tribraces is calculated in terms of the -multiplication and total composition. * ORDER REPRINTS 1610KLUGE AND PAAL over the tribraces {·, ·, ·}, dev {·,·,·} δ (h ⊗ f ⊗ g)

We consider basic algebraic constructions associated with an abstract pre-operad, such as a ⌣-algebra, total composition •, precoboundary operator δ, tribraces {·, ·, ·} and tetrabraces {·, ·, ·, ·}. A derivation deviation of the pre-coboundary operator over the tetrabraces is calculated in terms of the ⌣-multiplication and tribraces.Classification (MSC2000). 18D50.

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