Radius of Convergence
The distance between the center
of a power series' interval
of convergence and its endpoints.
If the series only converges at a single point, the radius of convergence
is 0. If the series converges over all real
numbers, the radius
of convergence is ∞.

See
also
Convergence
tests, power
series convergence,
Taylor series, Maclaurin series, infinity
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