考虑带权的L2(Bd,WBκ,μ(x))空间中Jackson不等式的精确常数,其中权WBκ,μ(x)(x∈Bd)与反射群相关.得到了Jackson不等式中的精确常数K(τ,n,r,d)(r≥1):En-1(f)WBκ,μ,2≤K(τ,n,r,d)ωr(f,τ)WBκ,μ,2.
Exact constant in Jackson inequality in the weighted space L2(Bd,WBκ,μ(x)) was considered,where weight function WBκ,μ(x)(x∈Bd) was related to reflection group.Exact constant K(τ,n,r,d)(r≥1) was obtained in the following inequality:En-1(f)WBκ,μ,2≤K(τ,n,r,d)ωr(f,τ)WBκ,μ,2.