From: Christian Bauer <Christian.Bauer@uni-mainz.de>
Date: Thu, 5 Apr 2001 19:44:47 +0000 (+0000)
Subject: - subs() can be used to substitute functions, tensors and indexed objects
X-Git-Tag: release_0-8-1~30
X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=commitdiff_plain;h=0af4f02790c8ae93f74b833a492c4a39ba7c342a;hp=828d660d98835773b239c1f8cde58841068ad9b4

- subs() can be used to substitute functions, tensors and indexed objects
- op(0) of an idx object returns the index value; a nice side-effect of
  this is that idx'es no longer all have the same hash value
---

diff --git a/NEWS b/NEWS
index 2283ab90..a2ef2d1f 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,8 @@ This file records noteworthy changes.
      gamma~0 in p.mu*gamma~mu should be p.0 but is returned as 0
    - using coeff(), tcoeff(), lcoeff() or collect() on elements of
      noncommutative products might return wrong or surprising results
+* Likewise, subs() can be used to substitute functions, tensors and indexed
+  expressions.
 * Added preliminary (re)implementations of color and clifford classes.
 * simplify_indexed(): contraction of symmetric and antisymmetric tensors
   is zero.