[0,1]nt1t2tm|Δ(t1,,tn)|2ck=1ntka-1(1-tk)b-1tk=1(Γ(1+c))nk=1ma+(n-k)ca+b+(2n-k-1)ck=1nΓ(a+(n-k)c)Γ(b+(n-k)c)Γ(1+kc)Γ(a+b+(2n-k-1)c),