Ilya Zakharevich on Mon, 5 Nov 2001 13:11:41 -0500

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Re: pari-2.2.1.alpha released

On Sun, Nov 04, 2001 at 02:39:00PM +0100, Karim BELABAS wrote:
> > BTW, is there a "better" semantic than doing substitutions
> > left-to-right?  Here "better" meaning one or more of "more
> > convenient", "more functionality", "less surprising".
> There should be a way to choose between 'left-to-right' (sequential) and
> 'parallel' (simultaneous) substitution. Both are relatively easy to
> implement.

But what does 'parallel' substitution means mathematically?  E.g.

  x  ->  y
  y  ->  x
 x+y -> x-y

What happens?