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Mathematical Methods for Physicists: A concise introduction - Site Map

Mathematical Methods for Physicists: A concise introduction - Site Map

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FUNCTIONS OF A COMPLEX VARIABLE<br />

z 0 , which is written as<br />

if<br />

lim f …z† ˆw 0 ; …6:9†<br />

z!z 0<br />

(a) f …z† is de®ned and single-valued in a neighborhood of z ˆ z 0 , with the<br />

possible exception of the point z 0 itself; and<br />

(b) given any positive number " (however small), there exists a positive number<br />

such that jf …z†w 0 j 0 we can ®nd (depending in<br />

general on ") such that jz 2 z 2 0 j 0 such that jf …z†f …z 0 † j

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