# Cone

A cone over topological space is the quotient

A point of that cone can be identified with a point and the distance to origin (the apex fiber) .

The reason I care about cones is the notion of the *tangent cone*
of a metric space at a point.

A cone over topological space is the quotient

A point of that cone can be identified with a point and the distance to origin (the apex fiber) .

The reason I care about cones is the notion of the *tangent cone*
of a metric space at a point.

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