Changes by: Yegor N. Bryukhov (ybryukhov at gc.cuny.edu)
Date: 2004-02-09 06:30:05 -0800 (Mon, 09 Feb 2004)
Revision: 5351
Log message:
Introduced one small resource arith_unfold - it does all rewrites which are not
actually reductions (distributivity, getting rid of subtraction).