Equation Icon  el p! ∑ −2ei1⋅⋅⋅ip(β) i1⋅⋅⋅ip 2 V(p) = 2 e (ℰ (p) ) , i1,i2,⋅⋅⋅,ip magn 1 ∑ −2mi ⋅⋅⋅i (β) 2 (2.20 ) V (p) = 2-(p +-1)! e 1 p+1 (ℱ (p)i1⋅⋅⋅ip+1) . i1,i2,⋅⋅⋅,ip+1