define limiting points?

Answer 1

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The limiting points correspond to the point circles of a coaxal system, and the limiting points of a coaxal system are inverse points with respect to any circle of the system.

Answer 2

A point about which inversion of two circles produced concentric circles. Every pair of distinct circles has two limiting points.

The point, edge, or line beyond which something cannot or may not proceed.

Answer 3

http://en.wikipedia.org/wiki/Limit_point