∫0,∞nt1⁢t2⁢⋯⁢tm⁢Δ⁡t1,…,tn2⁢c⁢∏k=1ntka-1⁢ⅇ-tk⁢ⅆ⁡tk=∏k=1ma+n-k⁢c⁢∏k=1nΓ⁡a+n-k⁢c⁢Γ⁡1+k⁢cΓ⁡1+cn,