Graduate Course: String Theory (2015)

This lecture note was chosen as the text for students' reading club at University of Tokyo for the spring semester 2016. Thanks a lot! I received some suggestions for the improvements and typos. Here are the slightly improved versions.
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I wrote a textbook (in Japanese) based on these lecture notes. It was released from Asakura Shoten in February 2017. The presentation is made a bit more formal. Some contents were added to and removed from the lecture notes. Please buy and compare!!!!