∫Vnt1z1-1⁢t2z2-1⁢⋯⁢tnzn-1⁢ⅆ⁡t1⁢ⅆ⁡t2⁢⋯⁢ⅆ⁡tn=Γ⁡(z1)⁢Γ⁡(z2)⁢⋯⁢Γ⁡(zn)Γ⁡(1+z1+z2+…+zn),