Introduction of conformal field theory: 2D CFT transformation and Virasoro algebra.

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Condensed Matter 2 course in National Tsing Hua University, 20200615 (Thanks 百祥 for editing). We discuss two dimensional conformal transformation and discuss the generators of the conformal group satisfy the Witt algebra. In the quantum level, the central extension of the Witt algebra gives the Virasoro algebra.
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