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In the complex field, is this function Harmonic?

  • Thread starter oab729
  • Start date
  • #1
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Homework Statement


Without directly verifying via the laplace equations, explain why Log|z| is harmonic in the punctured complex plane.

Homework Equations





The Attempt at a Solution


I thought it was because Log z is analytic on the complex plane except for the nonpositive real axis, so Log |z| would be analytic and hence harmonic since any |z| turns z into a positive real (for z=/= 0), hence Log |z| is like Log z for positive reals. But, if it's that, why would they ask to show its harmonic and not analytic.
 

Answers and Replies

  • #2
392
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Do you have the theorem that if f=u+iv is analytic then u is harmonic?
 

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