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Re^2: Obtaining terms in an expansion

by randyk (Parson)
on Jan 05, 2006 at 21:44 UTC ( #521365=note: print w/replies, xml ) Need Help??

in reply to Re: Obtaining terms in an expansion
in thread Obtaining terms in an expansion

It's not a homework problem, although I can see how it might look like one. The problem arises in something we're looking at involving quantum entanglement - each of the a[i][0] + a[i][1] terms (i=0, 1, 2, ..., N-1) represents a two-level quantum state. N such terms multiplied together thus represents a product state of N two-level states. We're then seeing if a general state can be written in this form - if it cannot, then the degree to which it can't is a measure of the degree of entanglement.

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Re^3: Obtaining terms in an expansion
by jdporter (Canon) on Jan 06, 2006 at 02:08 UTC
    my $prod = 1; # multiplicative identity, of course for ( @a ) { my($x,$y) = @$_; $prod *= $x + $y; }

    That does what you describe, but it's not 2^N. Not sure where the discrepancy lies...

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