normal.cpp, normal.h: Fix Yun's algorithm (there was a mistake in Geddes et

[ginac.git] / NEWS

diff --git a/NEWS b/NEWS
index b4bbbc0927260360bab808c6e6868264f2e202b2..2e80bc4f36f462d43a0fd9a2a4f337a50b65d94b 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,7 +1,23 @@
 This file records noteworthy changes.
 
-0.7.3 (<date>)
-* Added a section to the tutorial about adding new algebraic classes to GiNaC
+0.8.0 (<date>)
+* Complete revamp of indexed objects. Instead of multiple classes for
+  indexed things and their indices there is now only one "indexed" class
+  and two types of indices: "idx" for simple indices and "varidx" for
+  indices with variance. There are predefined delta, epsilon and metric
+  tensors, and a function simplify_indexed() that performs canonicalization
+  and dummy index summations.
+* Added an option "expand_indexed" to expand() to perform expansion of
+  indexed objects like (a+b).i -> a.i + b.i
+* Renamed get_indices() to get_free_indices(), which no longer returns
+  dummy indices and checks the consistency of indices in sums.
+* sqrfree() factorization fixed and improved syntactically.
+* subs() works on matrices.
+
+0.7.3 (28 February 2001)
+* Several bugfixes and minor performance tunings.
+* Added a section to the tutorial about adding new algebraic classes to GiNaC.
+* Closed many in-source documentation gaps.
 
 0.7.2 (17 February 2001)
 * Several bugfixes in power series expansion, one of them critical.