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The Cauchy condition for an infinite series Σ an on a compact set is:
For all ε > 0, there exists an N such that for all m, n that satisfies m ≥ n > N,

| an + an+1 + … + am| < ε

The series is said to be uniformly Cauchy if it satisfies the Cauchy condition.

A series of complex numbers is convergent if and only if it is uniformly Cauchy.

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