From: Trans <transfire@...>
Date: 2007-01-30T05:14:34+09:00
Subject: Re: cartesian product of arrays



On Jan 29, 12:57 pm, "GOTO Kentaro" <goto...@gmail.com> wrote:
> On 1/30/07, Trans <transf...@gmail.com> wrote:
>
> >   require 'facets/core/enumerable/op_pow'
>
> >   [1,2] ** [3,4,5]
> >   => [[1, 3], [1, 4], [1, 5], [2, 3], [2, 4], [2, 5]]
> Confusing operand order...
>
> In set theory, e.g.,http://mathworld.wolfram.com/Set.html
> the notation A^B, where A and B are arbitrary sets, is used to denote the
> set of maps from B to A.  Then we get (a**b).size == (a.size)**(b.size)

so maybe, i should probably get rid of that, maybe use it for actual 
cross-product instead?

t.