X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fclifford.h;h=af3cb7883568dea7fda15ade6d1abf191fd4ca99;hp=8ac696528873244d1ee6463e933425f256353973;hb=43e0a8f5ca5e1c48cef5daaf014acdbca4e44568;hpb=e58f5808a2d0fe6cb9d60370ede700d97a8bb702

diff --git a/ginac/clifford.h b/ginac/clifford.h
index 8ac69652..af3cb788 100644
--- a/ginac/clifford.h
+++ b/ginac/clifford.h
@@ -55,6 +55,10 @@ protected:
 	unsigned return_type(void) const { return return_types::noncommutative; }
 	unsigned return_type_tinfo(void) const { return TINFO_clifford + representation_label; }
 
+	// non-virtual functions in this class
+public:
+	unsigned char get_representation_label(void) const {return representation_label;}
+
 	// member variables
 private:
 	unsigned char representation_label; /**< Representation label to distinguish independent spin lines */
@@ -84,7 +88,8 @@ public:
 };
 
 
-/** This class represents the Dirac gamma5 object. */
+/** This class represents the Dirac gamma5 object which anticommutes with
+ *  all other gammas. */
 class diracgamma5 : public tensor
 {
 	GINAC_DECLARE_REGISTERED_CLASS(diracgamma5, tensor)
@@ -121,6 +126,21 @@ ex dirac_gamma(const ex & mu, unsigned char rl = 0);
  *  @return newly constructed object */
 ex dirac_gamma5(unsigned char rl = 0);
 
+/** Create a term of the form e_mu * gamma~mu with a unique index mu.
+ *
+ *  @param dim Dimension of index
+ *  @param rl Representation label */
+ex dirac_slash(const ex & e, const ex & dim, unsigned char rl = 0);
+
+/** 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.
+ *  In particular, the functional is not always cyclic in D != 4 dimensions
+ *  when gamma5 is involved.
+ *
+ *  @param rl Representation label */
+ex dirac_trace(const ex & e, unsigned char rl = 0);
+
 
 } // namespace GiNaC