On the other hand, when the central charge is sent to one while conformal dimensions stay continuous, Liouville theory tends to Runkel–Watts theory, a nontrivial conformal field theory (CFT) with a continuous spectrum whose three-point function is not analytic as a function of the momenta. Generalizations of Runkel-Watts theory are obtained from Liouville theory by taking limits of the type b 2 ∉ ∉ R , b 2 → → Q < 0 . So, for b 2 ∈ ∈ Q < 0 , two distinct CFTs with the same spectrum are known: Liouville theory, whose three-point function is analytic, and another CFT with a non-analytic three-point function.