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//                                                                      //
// Dirac Spinor Algebra Package                                         //
//                                                                      //
// The present package implements all the basic algorithms dealing      //
// with Dirac spinors, which form a fundamental representation of the   //
// group SL(2,2).  The basic classes are DiracSpinor and DiracMatrix,   //
// which are 4x1 and 4x4 complex matrices, respectively. In this        //
// context any complex 4x4 matrix that operates on Dirac spinors is     //
// called a Dirac matrix, and not simply the four or five Dirac gamma   //
// matrices.  The standard representation of Dirac is used for the      //
// gamma matrices 0-5.  The generators of the Lorentz group are the     //
// Sigma (rotation generators) and Kappa (boost generators) matrices.   //
//                                                                      //
// The standard matrices are identified by a discrete index of enum	//
// type EDiracIndex.  A EDiracIndex can take on a value from the list   //
// 	kDiracOne,	kDiracGamma1,	kDiracGamma2,	kDiracGamma3,	//
//	kDiracGamma4,	kDiracGamma5,	kDiracSigma1,	kDiracSigma2,	//
//	kDiracSigma3, 	kDiracKappa1, 	kDiracKappa2, 	kDiracKappa3.	//
// The constructor invoked with two EDiracIndex values i,j returns	//
// i_/2 [TDiracMatrix(i),TDiracMatrix(j)] where [a,b] denotes the com-	//
// utator of matrices a and b, and i_ is the positive square root of	//
// -1.  In general Dirac matrices describe operators and Dirac spinors	//
// describe relativistic fermion states.  Dirac matrices are also used	//
// to describe mixed states, ensembles that contain mixtures of		//
// particles described by more than one Dirac spinor.			//
//                                                                      //
// Spinors and matrices can be transformed under rotations and boosts   //
// according to the commutation rules for the group.  The most general  //
// transformation combining rotations and boosts is described by the    //
// LorentzTransform group defined in TFourVector.h.  All angles are     //
// assumed to be in radians.                                            //
//                                                                      //
// This package was developed at the University of Connecticut by       //
// Richard T. Jones                                                     //
//                                                                      //
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