- #1
haya
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Homework Statement
Let u(x; y) be real, nonconstant, and continuous in a closed
bounded region R. Let u(x; y) be harmonic in the interior of R. Prove that
the maximum and minimum value of u(x; y) in this region occurs on the boundary.
Homework Equations
the theorem said that( a function analtic in bounded domain and continuous up to and including its boundry attains its maximum modlus on the boundry
The Attempt at a Solution
can i suppose that u(x;y) is nonzero ?