Re: More on lists and sets

From: Mikito Harakiri <mikharakiri_nospaum_at_yahoo.com>
Date: 22 Mar 2006 22:22:14 -0800
Message-ID: <1143094934.295550.160450@z34g2000cwc.googlegroups.com>

Jonathan Leffler wrote:
> Mikito Harakiri wrote:
> > Let's focus on bags, first. Do you agree that
> >
> > {1,1} /\ {1,1,1} = {1,1,1,1,1,1}
>
> Where did the sixth one come from in the result?
> Is that a typo? If not, I am seriously puzzled.

5 would be for union. It corresponds to arithmetic addition of bag cardinalities. Intersection has to be either 2, 3, or 6, depending what second operation do we choose for bag cardinality: min, max, or multiply. I again vote for multiplication, but obviously need more convincing examples. Received on Thu Mar 23 2006 - 00:22:14 CST