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D-BRANES ON Calabi–Yau MANIFOLDS
In this review we study BPS D-branes on Calabi-Yau threefolds.Such D-branes naturally divide into two sets called A-branes and B-branes which are most easily understood from topological field theory.The main aim of this paper is to provide a self-contained guide to the derived category approach to B-branes and the idea …