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==Renormalization==
This model proved to be relevant in string theory where the two-dimensional manifold is named '''[[worldsheet]]'''. Appreciation of its generalized renormalizability was provided by [[Daniel Friedan]].<ref name="Frie80">
{{cite journal|last=Friedan|first=D.|authorlink=Daniel Friedan|title=Nonlinear models in 2+ε dimensions | journal = PRL | volume = 45 | issue = 13| pages = 1057 |publisher=|___location=| year = 1980 | url = http://link.aps.org/doi/10.1103/PhysRevLett.45.1057 |doi= 10.1103/PhysRevLett.45.1057 | bibcode=1980PhRvL..45.1057F}}</ref> He showed that the theory admits a renormalization group equation, at the leading order of perturbation theory, in the form
:<math>\lambda\frac{\partial g_{ab}}{\partial\lambda}=\beta_{ab}(T^{-1}g)=R_{ab}+O(T^2)~,</math>
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