نبذة مختصرة : These are lecture notes on string theory at Fudan University.
Comment: 165 pages, no originality claimed; comments are welcome. ; v2 corrections in section 2.2,8.1,9.2,15.2,16.3,16.4 with apology for text overlaps by the first author in v1; v3 implement various improvements; v4 add section for Green-Schwarz anomaly cancellation, and typos corrected
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