equations for a fairly general class of nonconvex Hamiltonians with superlinear growth in the
gradient variable. The approach is mainly based on classical techniques for uniformly
parabolic quasilinear equations and on the Lipschitz estimates provided in [SN Armstrong
and HV Tran, Viscosity solutions of general viscous Hamilton–Jacobi equations, Math. Ann.
361 (2015) 647–687], as well as on viscosity solution arguments.