Here is a really quick derivation of the Cauchy-Riemann equations of complex analysis.

Consider a function of a complex variable, , where , such that:

,

where and are real-valued functions.

An analytic function is one that is expressible as a power series in .

That is,

.

Then,

.

We formally differentiate this equation as follows. First, differentiating with respect to , we obtain

.

Differentiating with respect to , we obtain

.

Multiplying the latter equation by and equating to the first result, we obtain

.

Comparing imaginary and real parts of these equations, we obtain

,

which are the famous **Cauchy-Riemann equations**.

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## 2 replies on “A Really Quick Derivation of The Cauchy-Riemann Equations”

Dear Ikjyit,

I have seen your paper on arXiv in which you had tried to solve the Shwarzschild black hole in the context if Schrodinger equation but left unfinished. I am curious to know if you have solved it or not.

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