1.0.13 (<date>)
* Contracting epsilon tensors with Euclidean indices now works.
* Improved dummy index symmetrization in sums.
+* Added dirac_gammaL/R(), which can be used instead of dirac_gamma6/7()
+ but are single objects, to allow for a more compact notation of Dirac
+ strings.
1.0.12 (30 October 2002)
* Fixed a bug in power::expand() that could produce invalid expressions.