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Homework Statement
Suppose z0 = x0 + iy0 2 C, and r > 0. Further, suppose that f(z) is a real valued function that is analytic on the open box
B(z0; r) = { x + iy | x0 < x < x0 + r; y0 < y < y0 + r }.
Then show that f(z) must, in fact, be constant on the box B(z0; r).
The Attempt at a Solution
I really have no idea at all what this question is asking me to do. Can someone please point me in the right direction? I am not asking anyone to do it for me, I am happy to figure it out by myself once i have some idea of what I am supposed to do.