1.0.9 (<date>)
* simplify_indexed() now raises/lowers dummy indices to canonicalize the index
variance. This allows some simplifications that weren't possible before,
- like eps~a.b~c~d*X.a*X~b -> 0.
+ like eps~a.b~c~d*X.a*X~b -> 0 and X.a~a-X~a.a -> 0.
+* Implemented relational::subs().
1.0.8 (31 March 2002)
* Improvements in memory usage of the expand() methods.