X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fclifford.h;h=ce5d2acfd50a6b3430d5717c9aa125389d19f3fc;hp=2d1680c2604ea507c7a2bcd7d871337c7f1caf56;hb=dbd9c306a74f1cb258c0d15a346b973b39deaad2;hpb=e7cc6a764ff67b5885d6633385fac23ccc1dc9a7

diff --git a/ginac/clifford.h b/ginac/clifford.h
index 2d1680c2..ce5d2acf 100644
--- a/ginac/clifford.h
+++ b/ginac/clifford.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's clifford algebra (Dirac gamma) objects. */
 
 /*
- *  GiNaC Copyright (C) 1999-2002 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2003 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
@@ -52,8 +52,8 @@ public:
 	void print(const print_context & c, unsigned level = 0) const;
 
 protected:
-	bool match_same_type(const basic & other) const;
 	ex simplify_ncmul(const exvector & v) const;
+	bool match_same_type(const basic & other) const;
 	ex thisexprseq(const exvector & v) const;
 	ex thisexprseq(exvector * vp) const;
 	unsigned return_type(void) const { return return_types::noncommutative; }
@@ -104,6 +104,30 @@ public:
 };
 
 
+/** This class represents the Dirac gammaL object which behaves like
+ *  1/2 (1-gamma5). */
+class diracgammaL : public tensor
+{
+	GINAC_DECLARE_REGISTERED_CLASS(diracgammaL, tensor)
+
+	// functions overriding virtual functions from base classes
+public:
+	void print(const print_context & c, unsigned level = 0) const;
+};
+
+
+/** This class represents the Dirac gammaL object which behaves like
+ *  1/2 (1+gamma5). */
+class diracgammaR : public tensor
+{
+	GINAC_DECLARE_REGISTERED_CLASS(diracgammaR, tensor)
+
+	// functions overriding virtual functions from base classes
+public:
+	void print(const print_context & c, unsigned level = 0) const;
+};
+
+
 // global functions
 
 /** Specialization of is_exactly_a<clifford>(obj) for clifford objects. */
@@ -131,10 +155,20 @@ ex dirac_gamma(const ex & mu, unsigned char rl = 0);
  *  @return newly constructed object */
 ex dirac_gamma5(unsigned char rl = 0);
 
-/** This returns (dirac_ONE(rl) + dirac_gamma5(rl)). */
-ex dirac_gamma6(unsigned char rl = 0);
+/** Create a Dirac gammaL object.
+ *
+ *  @param rl Representation label
+ *  @return newly constructed object */
+ex dirac_gammaL(unsigned char rl = 0);
+
+/** Create a Dirac gammaR object.
+ *
+ *  @param rl Representation label
+ *  @return newly constructed object */
+ex dirac_gammaR(unsigned char rl = 0);
 
-/** This returns (dirac_ONE(rl) - dirac_gamma5(rl)). */
+// These functions are deprecated. Use dirac_gammaL/R() instead.
+ex dirac_gamma6(unsigned char rl = 0);
 ex dirac_gamma7(unsigned char rl = 0);
 
 /** Create a term of the form e_mu * gamma~mu with a unique index mu.