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To elaborate on cperciva's (correct) point: On a projective plane a parabola contains a single point at infinity, connected (both figuratively and topologicall
by gambling8nt 17y ago
To elaborate on cperciva's (correct) point:
On a projective plane a parabola contains a single point at infinity, connected (both figuratively and topologically) to the two open ends. A hyperbola contains two distinct points at infinity each connected to one end of each of the two usual components.