added wildcard and spinormetric classes to check

[ginac.git] / NEWS

diff --git a/NEWS b/NEWS
index 60ae0667a33b083eb58e5845bc39ae937aa7324e..d08e730e48711ef795f7a6e337820f202b3dcf0b 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,7 +1,26 @@
 This file records noteworthy changes.
 
-0.8.3 (<date>)
+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.
+* 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).
+* Semantics of arithmetic operators now follows the C++ rules more strictly.
 
 0.8.2 (24 April 2001)
 * degree(), ldegree(), coeff(), lcoeff(), tcoeff() and collect() work with