T-duality in superstring theory
Comments: 26 pages, 4 figures
We study T-duality in the superstring theory in the large-$N_f$ limit. We find that the T-duality is a class of T-duality solutions in the large-$N_f$ limit. We discuss the relation between the T-duality solution and the T-duality of the superstring. We also discuss the relation between T-duality and the T-duality of the superstring.