a vector of norm 1
a ball of radius r
an element of finite order
the group of invertible elements of E
Actually, S has the much stronger property of being convex.
This method has the disadvantage of not being intrinsic.
However, only 5 of these are distinct.
The best known of these is the Knaster continuum.
Of these, (i) and (ii) are almost immediate from the definition.
Theorem 2 of [8]
Suppose that of all such solutions, (x,y,z) is one with y minimal.
statement (ii) of Proposition 7
However, this cannot be proved of the cardinal function d(X).
For example, F reaches a relative maximum of 5.2 at about x=2.1.
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