Re: ordered pairs/n-tuples as collections of sets
- From: William Elliot <marsh@xxxxxxxxxxxxxxxxxx>
- Date: Sun, 3 Jul 2005 08:49:27 -0700
On Sun, 3 Jul 2005, Elotemuygrande wrote:
> Suppose you define a 2-tuple this way, which I just found in a book.
> T=(a,b)={{a}, {a,b}}
>
> Is there a way to express T_1 and T_2, the first and second elements of
> the tuple in terms of standard operations on sets like intersection and
> union
/\/\(a,b)
\/(\/(a,b) - /\(a,b)) if nonnul
\//\(a,b) otherwise
.
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- From: Elotemuygrande
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