Let u be a harmonic function on the unit ball b1

Reference no: EM13896282

Let u be a harmonic function on the unit ball B₁ with ||u||_∞ = sup_z∈B1|u (z)|< ∞, show that |∇u (0)|<=||u||_∞. Here c is an absolute constant.

Reference no: EM13896282

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