Mathematics – Rings and Algebras
Scientific paper
2007-03-27
J. Pure and Appl. Algebra, vol 212 (2008), 522-540
Mathematics
Rings and Algebras
21 pages
Scientific paper
A Rota-Baxter operator of weight $\lambda$ is an abstraction of both the integral operator (when $\lambda=0$) and the summation operator (when $\lambda=1$). We similarly define a differential operator of weight $\lambda$ that includes both the differential operator (when $\lambda=0$) and the difference operator (when $\lambda=1$). We further consider an algebraic structure with both a differential operator of weight $\lambda$ and a Rota-Baxter operator of weight $\lambda$ that are related in the same way that the differential operator and the integral operator are related by the First Fundamental Theorem of Calculus. We construct free objects in the corresponding categories. In the commutative case, the free objects are given in terms of generalized shuffles, called mixable shuffles. In the noncommutative case, the free objects are given in terms of angularly decorated rooted forests. As a byproduct, we obtain structures of a differential algebra on decorated and undecorated planar rooted forests.
Guo Li
Keigher William
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