Abstract:We report on some recent progress which has been made in the understanding of general features of superstring compacti cations. The following aspects are discussed: special geometry of the moduli space of (2,2) vacua, target-space duality symmetries, di erential equations for the periods of holomorphic three-forms, and higher loop (genus) string corrections to the tree-level e ective action through target-space modular anomaly cancellations.
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