On integrability of Weingarten surfaces: a forgotten class

Rediscovered by a systematic search, a forgotten class of integrable surfaces is shown to disprove the Finkel-Wu conjecture. The associated integrable nonlinear partial differential equation $z_{yy} + (1/z)_{xx} + 2 = 0$ possesses a zero curvature representation, a third-order symmetry, and a nonlocal transformation to the sine-Gordon equation $ϕ_{ξη} = \sinϕ$. We leave open the problem of finding a Backlund autotransformation and a recursion operator that would produce a local hierarchy.

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