The partial differential equation
which contains instead of and instead to , as in the sine-Gordon equation (Grauel 1985; Zwillinger 1997, p. 135).
The partial differential equation
which contains instead of and instead to , as in the sine-Gordon equation (Grauel 1985; Zwillinger 1997, p. 135).
Weisstein, Eric W. "Sinh-Gordon Equation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Sinh-GordonEquation.html