Better handling of Clifford objects [V.Kisil].

[ginac.git] / ginac / indexed.h

diff --git a/ginac/indexed.h b/ginac/indexed.h
index f4891490a09d7d8b84521e17773977025074c11b..ad32c2372fee25e55e0fef167de8be32000eeea0 100644 (file)
--- a/ginac/indexed.h
+++ b/ginac/indexed.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's indexed expressions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2004 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2005 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -17,7 +17,7 @@
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #ifndef __GINAC_INDEXED_H__
@@ -172,7 +172,8 @@ public:
        exvector get_dummy_indices() const;
 
        /** Return a vector containing the dummy indices in the contraction with
-        *  another indexed object. */
+        *  another indexed object. This is symmetric: a.get_dummy_indices(b)
+        *  == b.get_dummy_indices(a) */
        exvector get_dummy_indices(const indexed & other) const;
 
        /** Check whether the object has an index that forms a dummy index pair
@@ -249,6 +250,23 @@ template<> inline bool is_exactly_a<indexed>(const basic & obj)
        return obj.tinfo()==TINFO_indexed;
 }
 
+/** Returns all dummy indices from the expression */
+exvector get_all_dummy_indices(const ex & e);
+
+/** Returns b with all dummy indices, which are common with a, renamed */
+ex rename_dummy_indices_uniquely(const ex & a, const ex & b);
+
+/** This function returns the given expression with expanded sums
+ *  for all dummy index summations, where the dimensionality of 
+ *  the dummy index is numeric.
+ *  Optionally all indices with a variance will be substituted by 
+ *  indices with the corresponding numeric values without variance.
+ *
+ *  @param e the given expression
+ *  @param subs_idx indicates if variance of dummy indixes should be neglected
+ */
+ex expand_dummy_sum(const ex & e, bool subs_idx = false);
+
 } // namespace GiNaC
 
 #endif // ndef __GINAC_INDEXED_H__