951 research outputs found
A Unified Elementary Approach to the Dyson, Morris, Aomoto, and Forrester Constant Term Identities
We introduce an elementary method to give unified proofs of the Dyson,
Morris, and Aomoto identities for constant terms of Laurent polynomials. These
identities can be expressed as equalities of polynomials and thus can be proved
by verifying them for sufficiently many values, usually at negative integers
where they vanish. Our method also proves some special cases of the Forrester
conjecture.Comment: 20 page
Notes on Feynman Integrals and Renormalization
I review various aspects of Feynman integrals, regularization and
renormalization. Following Bloch, I focus on a linear algebraic approach to the
Feynman rules, and I try to bring together several renormalization methods
found in the literature from a unifying point of view, using resolutions of
singularities. In the second part of the paper, I briefly sketch the work of
Belkale, Brosnan resp. Bloch, Esnault and Kreimer on the motivic nature of
Feynman integrals.Comment: 39
A family of q-Dyson style constant term identities
AbstractBy generalizing Gessel–Xin's Laurent series method for proving the Zeilberger–Bressoud q-Dyson Theorem, we establish a family of q-Dyson style constant term identities. These identities give explicit formulas for certain coefficients of the q-Dyson product, including three conjectures of Sills' as special cases and generalizing Stembridge's first layer formulas for characters of SL(n,C)
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