Abstract
In this paper we discuss algebraic-geometric problems connected with the mathematical testing of the S-duality conjecture. In particular, we give a complete description of the field configurations in classical gauge theories for which the coefficient of the Gell-Mann-Low beta-function in the one-loop approximation equals zero. Realizing one of these configurations geometrically on Del Pezzo surfaces, we demonstrate its relation to exceptional bundles: every exceptional bundle whose cohomology is zero and whose slope is negative but exceeds the slope of the canonical class gives a correlation function for S-duality testing.
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