On the differential Novikov algebras

Abstract

We study the quadratic operad $\Der\Nov_q$ determined by the degree-$3$ identities arising from the operad $\Nov\circ\Nov$, and its quadratic dual $\Der\Nov^!$. We show that the natural epimorphism \[ \Der\Nov_q\longrightarrow \Nov\circ\Nov \] is not an isomorphism: in arity $4$ the corresponding dimensions are $491$ and $400$, respectively. We obtain a presentation of $\Der\Nov^!$ by two binary operations and show that every mixed monomial can be reduced to a linear combination of pure monomials. The pure $\prec$-component is described as a free right Novikov algebra subject to three additional identities, while the pure $\succ$-component is a free bicommutative algebra subject to two additional identities. We construct explicit bases for both components, determine the dimensions of the multilinear components, and prove that the bicommutative operad and $\Der\Nov^!$ satisfy the Dong property.

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