Entire function invariant by translation is constant [duplicate]
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Proving that a doubly-periodic entire function $f$ is constant.
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I need to apply Liouville theorem ("entire bounded complex functions are constant") to prove that an entire function satisfying: $$f(z)=f(z+1)=f(z+i)$$ for all complex numbers $z$ is constant. I'm really not sure on how to proceed, I've tried expanding in Taylor series but I've got confused with calculations and I can't proceed any further.
complex-analysis holomorphic-functions entire-functions
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