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Re: mathematical models

   No, this has been ruled out explicitly.  My copy of R4RS says of page 8:

   ``Note:  Although the order of evaluation is otherwise unspecified,
   the effect of any concurrent evaluation of the operator and operand
   expressions is constrained to be consistent with some sequential order
   of evaluation. ...''

I stand corrected.

    Jeff (http://www.neci.nj.nec.com/homepages/qobi.html)