[net.physics] open-closed, bounded-unbounded, fini

iles@hplabs.UUCP (01/10/85)

A closed set is not necessarily bounded.

Consider the set of integers.  It is clearly closed, also clearly
not bounded.  Also the set of complex numbers (R2) falls into this
category.

Perhaps things are different for connected sets, but this generalization
is not true, at least as far as math is concerned.