How do I show |Rez - Rez0|<E whenever 0<|z-z0|<D is true, where E and D are real number greater than 0, and z is obviously a complex number?(adsbygoogle = window.adsbygoogle || []).push({});

In other words, proving that the lim of Rez (as z approaches z0)=Rez0.

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# Some limit proofs

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