∫0,1nt1⁢t2⁢⋯⁢tm⁢Δ⁡t1,…,tn2⁢c⁢∏k=1ntka-1⁢1-tkb-1⁢ⅆ⁡tk=1Γ⁡1+cn⁢∏k=1ma+n-k⁢ca+b+2⁢n-k-1⁢c⁢∏k=1nΓ⁡a+n-k⁢c⁢Γ⁡b+n-k⁢c⁢Γ⁡1+k⁢cΓ⁡a+b+2⁢n-k-1⁢c,