# Cauchy-Riemann Equations : First-Order Partial Derivatives

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3. Use Cauchy-Riemann equations and the given theorem to show that the function

_

f (z) = e^z

is not analytic anywhere.

Theorem: Suppose that

f (z) = u (x, y) + i v (x, y)

and that f'(z) exists at a point z0 = x0 + i y0. Then the first-order partial derivatives of u and v must exist at (x0, y0), and they must satisfy the Cauchy-Riemann equations

ux = vy, uy = - vx

there. Also, f ΄(z0) can be written

f ΄(z0) = ux + i vx,

where these partial derivatives are to be evaluated at (x0, y0).

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3. Use Cauchy-Riemann equations and the given theorem to show that the function

f (z) = e z

is not ...

#### Solution Summary

Cauchy-Riemann Equations and First-Order Partial Derivatives are investigated. The solution is detailed and well presented.