Second try:
(power {1, 2, 3}) = ? {{ }, {1}, {2}, {3}, {1,2}, {2,3}, {1,2,3}}
.
And I give you a little subject research: if a set x has n elements, how many
elements are in (power x)?
How's this for a wild guess? I have a feeling that it's missing the
accolades, but I have no idea where to put them.
(power {x}) = n(n-1) (n-2)...(n-x+1)
x!
Bruno
http://iridia.ulb.ac.be/~marchal/
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