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The Becker-Becker-Strominger formula, describing the string world-sheetinstanton corrections to the four-fermion correlator in the Calabi-Yaucompactified type-IIA superstrings, is calculated in the special case of theCalabi-Yau threefold realized in the intersection of two Del Pezzo surfaces. Wealso derive the selection rules in the supersymmetric GUT of the Pati-Salamtype associated with our construction.Comment: 17 pages, LaTeX, 2 Tables, 1 diagra

Type IIA string instanton corrections to the four-fermion correlator in the intersection of Del Pezzo surfaces