ISU Algebra Seminar Presentation by L.M. Ionescu, 10/25/2007

 Rota-Baxter Algebras III: Splitting an RBA of type I (Outline) 1) Recall on RB-operator (type 1) and algebras; notation - Proposition RBO projector <=> direct sum of algebras - In the filtered (graded) case, this is the generic case! - Proposition (new?): Graded connected RBA => i) R projector, ii) R(1)=0 or 1. proof: ... - Corollary (new?):       i) Graded connected RBA <=> direct sum of graded connected algebras,       ii) classification of RBOs on GC-RBAs: R=R+ iff R1=1, R=R- iff R1=0. - The filtered RBA should be thought of as a topological RBA (degree topology), separated if connected. - The graded RBA may be thought of as a geometric RBA (Lie group/Hilbert space sense). 2)  The \chi map from the Article (constructive): - "Derived products" and powers notation, - There is a unique map \chi s.t. \chi(a)=a-BCH(R(\chi(a)),R'(\chi(a))). 3) Interpretation: - Derived products and "propagators"; - Symmetrization of the derived product and "star product" of a RBA \star (deformations): -\star=\cdot - \cup - Short note on BCH-formula: transfer of structure, deformation, Maurer-Cartan initial value problem, formal Moyal's formula (on graphs) - Comparing + & o-plus: A) the star-convolution,     B) Theorem: (i) \chi is the inverse of R\star R', ii) \Lambda as an infinitesimal "defect" (transition function)     C) Conjecture: R\chi transfers to an RB-group structure on G=1+A1
LI 10/25/2007