Trace formulae for curvature of Jet Bundles over planar domain

For a domain \Omega in \mathbb{C} and an operator T in \mathcal{B}_n(\Omega), Cowen and Douglas construct a Hermitian holomorphic vector bundle E_T over \Omega corresponding to T. The Hermitian holomorphic vector bundle E_T is obtained as a pull-back of the tautological bundle S(n,\mathcal{H}) defined over \mathcal{G}r(n,\mathcal{H}) by a nondegenerate holomorphic map z\mapsto {\rm{ker}}(T-z) for z\in\Omega. To find the answer to the converse, Cowen and Douglas studied the jet bundle in their foundational paper. The computations in this paper for the curvature of the jet bundle are somewhat difficult to comprehend. They have given a set of invariants to determine if two rank n Hermitian holomorphic vector bundle are equivalent. These invariants are complicated and not easy to compute. It is natural to expect that the equivalence of Hermitian holomorphic jet bundles should be easier to characterize. In fact, in the case of the Hermitian holomorphic jet bundle \mathcal{J}_k(\mathcal{L}_f), we have shown that the curvature of the line bundle \mathcal{L}_f completely determines the class of \mathcal{J}_k(\mathcal{L}_f). In case of rank n Hermitian Holomorphic vector bundle E_f, We have calculated the curvature of jet bundle \mathcal{J}_k(E_f) and also have generalized the trace formula for jet bundle \mathcal{J}_k(E_f).Comment: 14 page

Weak core and central weak core inverse in a proper ∗*-ring

In this paper, we introduce the notion of weak core and central weak core inverse in a proper $*$-ring. We further elaborate on these two classes by producing a few representation and characterization of the weak core and central weak core invertible elements. We investigate additive properties and a few explicit expressions for these two classes of inverses through other generalized inverses. In addition to these, numerical examples are provided to validate a few claims on weak core and central weak core inverses.Comment: 20 pages, 1 figur