2.I.7E2 . \mathrm{I} . 7 \mathrm{E} \quad

Complex Methods | Part IB, 2001

A complex function is defined for every zVz \in V, where VV is a non-empty open subset of C\mathbb{C}, and it possesses a derivative at every zVz \in V. Commencing from a formal definition of derivative, deduce the Cauchy-Riemann equations.

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