We had a test for the rearrangement cone being proper, but it
incorrectly tested the p=0 case. Now that we're sanity-checking p,
that test was throwing a ValueError. Fix it to use p >= 1.
sage: all( rearrangement_cone(p,n).is_proper()
....: for n in xrange(10)
sage: all( rearrangement_cone(p,n).is_proper()
....: for n in xrange(10)
- ....: for p in xrange(n) )
+ ....: for p in xrange(1, n) )
True
The Lyapunov rank of the rearrangement cone of order ``p`` in ``n``
True
The Lyapunov rank of the rearrangement cone of order ``p`` in ``n``