ABCD.cpp

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#include "HEP.h"
#include <cmath>
 
namespace HepLib {
 
    ex A0(const ex m2, int n, ex d) {
        return I*pow(ex(-1),n)*pow(2,-d)*pow(Pi, -d/2)*pow(m2, -1 + d/2)*pow(tgamma(ex(n)), -1)*tgamma(-d/2 + n);
    }
 
}