Let be $f:\mathbb{C} \to \mathbb{C}$ entire function such as $f(z)=f(z+i)=f(z+1)$ for all $z$. Show that $f$ is constant.
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Hi Peppe, welcome to StackExchange! Can you tell us what you've tried/what you think might be the key to solving the problem so that we might help you better? Also, in the future, please use MathJax to format your questions. – scoopfaze Jul 01 '19 at 13:20
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Sure we can. But first of all please write what did you try. – Mark Jul 01 '19 at 13:21