
handle: 2440/108376 , 1885/107111
Harmonic functions of two variables are exactly those that admit a conjugate, namely a function whose gradient has the same length and is everywhere orthogonal to the gradient of the original function. We show that there are also partial differential equations controlling the functions of three variables that admit a conjugate.
Mathematics - Differential Geometry, conformal invariant, Differential Geometry (math.DG), partial differential equation, conformal Killing field, 53A30, FOS: Mathematics, conjugate function, partial differential inequality, 3-harmonic function
Mathematics - Differential Geometry, conformal invariant, Differential Geometry (math.DG), partial differential equation, conformal Killing field, 53A30, FOS: Mathematics, conjugate function, partial differential inequality, 3-harmonic function
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