X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fclifford.h;h=81abd9f5c879c956da862f009fc5f24f6b7bcbc4;hp=667d7befd9d400749188f8af6f28bcecee1ce83e;hb=ba0b56c5ac76274c5d748eaa29fbd83cb1d4fb9e;hpb=09f0415b7442714ea9adae30872d151452185962;ds=sidebyside

diff --git a/ginac/clifford.h b/ginac/clifford.h
index 667d7bef..81abd9f5 100644
--- a/ginac/clifford.h
+++ b/ginac/clifford.h
@@ -28,6 +28,8 @@
 #include "symbol.h"
 #include "idx.h"
 
+#include <set>
+
 namespace GiNaC {
 
 
@@ -226,6 +228,26 @@ ex dirac_gammaR(unsigned char rl = 0);
  *  @param rl Representation label */
 ex dirac_slash(const ex & e, const ex & dim, unsigned char rl = 0);
 
+/** Calculate dirac traces over the specified set of representation labels.
+ *  The computed trace is a linear functional that is equal to the usual
+ *  trace only in D = 4 dimensions. In particular, the functional is not
+ *  always cyclic in D != 4 dimensions when gamma5 is involved.
+ *
+ *  @param e Expression to take the trace of
+ *  @param rls Set of representation labels
+ *  @param trONE Expression to be returned as the trace of the unit matrix */
+ex dirac_trace(const ex & e, const std::set<unsigned char> & rls, const ex & trONE = 4);
+
+/** Calculate dirac traces over the specified list of representation labels.
+ *  The computed trace is a linear functional that is equal to the usual
+ *  trace only in D = 4 dimensions. In particular, the functional is not
+ *  always cyclic in D != 4 dimensions when gamma5 is involved.
+ *
+ *  @param e Expression to take the trace of
+ *  @param rll List of representation labels
+ *  @param trONE Expression to be returned as the trace of the unit matrix */
+ex dirac_trace(const ex & e, const lst & rll, const ex & trONE = 4);
+
 /** Calculate the trace of an expression containing gamma objects with
  *  a specified representation label. The computed trace is a linear
  *  functional that is equal to the usual trace only in D = 4 dimensions.