lambda.h

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#ifndef LAMBDA_HH
#define LAMBDA_HH
// author: Jonas Rademacker (Jonas.Rademacker@bristol.ac.uk)
// status:  Mon 9 Feb 2009 19:17:58 GMT

//double lambda(double x, double y, double z);

inline double lambda(double x, double y, double z){  
  double a = (x-y-z);
  return a*a - 4*y*z;
}
#endif
//