研究两类重要的分别形如F=α+εβ+βarctan(β/α)和F=α^2(α-β)+μβ的(α,β)-度量,其中μ≠-1和ε≠0为常数,α=√αu(x)yiyi为黎曼度量,β=bi(x)yi为流形上的1-形式.得到它们为局部对偶平坦的Douglas度量的充要条件.
Two important classes of (α,β)-metrics in the forms of F=α+εβ+βarctan(β/α) and F=α^2(α-β)+μβ were considered, whereμ≠-1 and ε≠0 were constants, α=√αu(x)yiyi was Riemannianmetric, β=bi(x)yi was a 1-form on a manifold. The sufficient and necessary conditions for them to be locally dually flat Douglas metrics were obtained.