dirac_gamma(mu.toggle_variance()) *
(dirac_slash(l, dim) + m * dirac_ONE());
e = dirac_trace(e).simplify_indexed(sp);
result += check_equal(e, 4*((2-dim)*l*l + (2-dim)*ldotq + dim*m*m).expand());
dirac_gamma(mu.toggle_variance()) *
(dirac_slash(l, dim) + m * dirac_ONE());
e = dirac_trace(e).simplify_indexed(sp);
result += check_equal(e, 4*((2-dim)*l*l + (2-dim)*ldotq + dim*m*m).expand());