Conformal Field Theory at C=1
Conformal field theory  is a subject of great interest to various disciplines in physics. Although we are still far from a complete understanding, partial results seem to indicate that a beautiful, deep mathematical structure lies at its roots. The situation for central charge c<1 is by now very well understood . The case c=1 however forms in many aspects a natural boundary. Here we meet the new features of an infinity of primary fields and the existence of marginal operators and deformations. Futhermore, the c=1 models allow a natural interpretation as a string complication. As such they can serve as an instructive example of what is to be expected at higher c values.
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