- added symmetrize() and antisymmetrize() functions

[ginac.git] / NEWS

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 This file records noteworthy changes.
 
-0.8.3 (10 May 2001)
+0.8.4 (<date>)
+* simplify_indexed() renames dummy indices so, e.g., "a.i*a.i+a.j*a.j" gets
+  simplified to "2*a.i*a.i".
+* Added canonicalize_clifford() function that can be helpful when comparing
+  expressions containing Dirac matrices.
+* Added a new function match() for performing pattern matching. subs() and
+  has() also accept patterns as arguments. A pattern can be any expression,
+  optionally containing wildcard objects. These are constructed with the
+  call "wild(<unsigned>)" and are denoted as "$0", "$1" etc. in the output
+  and in ginsh.
+* Added symmetrize() and antisymmetrize() functions.
+* Fixed possible crash when calling subs() on expressions with non-commutative
+  products.
+
+0.8.3 (11 May 2001)
+* color and clifford classes are functional and documented.
+* New "spinidx" class for dotted/undotted indices.
+* Predefined spinor metric tensor (created by spinor_metric()).
 * Symbols can have a LaTeX name, e.g. symbol s("s", "\\sigma");
 * LaTeX output of indexed objects is much nicer.
 * Fix some build-problems (with recent libreadline).