Re: Just a quickie!...

Posted by DickT on November 19, 19100 at 14:19:53:

In Reply to: Re: Just a quickie!... posted by Stefan on November 19, 19100 at 07:41:24:

In topology, the "boundary" of an n-dimensional object is (n-1)-dimensional. For example the boundary of the 3-dimensional ball is the 2-dimensional spherical surface. It is an interestiing theorem in topology that a boundary doesn't itself have a boundary, ever. The spherical surface (like the surface of that well known ball, the Earth) has no edge.

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