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<p>Holomorphic functions are also sometimes referred to as regular functions. A holomorphic function whose domain is the whole <a href="page.php?w=complex_plane">complex plane</a> is called an <a href="page.php?w=entire_function">entire function</a>. The phrase "holomorphic at a point " means not just differentiable at , but differentiable everywhere within some close neighbourhood of  in the complex plane.</p>

<p><big> Definition </big></p>
<p>Given a complex-valued function  of a single complex variable, the <b>derivative</b> of  at a point  in its domain</p><p>
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