Hello! The GiNaC Development Group (which is effectively reduced to one member now) wishes everybody a Happy New Year (belatedly) and a Happy <insert-your- favorite-religiously-motivated-around-new-year-celebration-here>, and is proud to present GiNaC 1.0.13, the latest in C++-based made-for-physicists- but-useful-for-other-people-too computer algebra library technology. Now with these exciting new features: * 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. * Powers with negative numeric exponents are printed as fractions in the LaTeX output. * Added symbolic_matrix() for the convenient creation of matrices filled with symbols. * Added collect_common_factors() which collects common factors from the terms of sums. * simplify_indexed() converts "gamma~mu*p.mu" to "p\". As usual, it's available from our FTP server: ftp://ftpthep.physik.uni-mainz.de/pub/GiNaC Happy computing, Christian -- / Coding on PowerPC and proud of it \/ http://www.uni-mainz.de/~bauec002/