Zero (complex Analysis) - Multiplicity of A Zero

Multiplicity of A Zero

A complex number a is a simple zero of f, or a zero of multiplicity 1 of f, if f can be written as

where g is a holomorphic function g such that g(a) is not zero.

Generally, the multiplicity of the zero of f at a is the positive integer n for which there is a holomorphic function g such that

The multiplicity of a zero a is also known as the order of vanishing of the function at a.

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