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# Also: AWW YEAH:
r = pp.P([1,2,3,0])
r * r
[2, 3, 0, 1]
r * r * r
[3, 0, 1, 2]
r * r * r * r
[0, 1, 2, 3]

(, Sat 23 Jan 2010, 17:59, archived)
# r.dr.r
(, Sat 23 Jan 2010, 18:07, archived)