自Oxford Advanced Learner's Dictionary of Current English(以下简称《牛津》)和Zongman Dictionary of Contem porary English(以下简称《朗曼》)问世以来，它们在上世纪下半叶中一直风行全世界。这两本英语学习者词典的目的在...自Oxford Advanced Learner's Dictionary of Current English(以下简称《牛津》)和Zongman Dictionary of Contem porary English(以下简称《朗曼》)问世以来，它们在上世纪下半叶中一直风行全世界。这两本英语学习者词典的目的在于解决外国研习英语者所面临的特殊困难。展开更多
Let （M, θ） be a strictly pseudo-convex CR manifold. Choose an admissible coframe {θ<sup>α</sup>}, such that dθ=ih<sub>α（?）</sub> θ<sup>α</sup>∧θ（?）, where (h<sub&...Let （M, θ） be a strictly pseudo-convex CR manifold. Choose an admissible coframe {θ<sup>α</sup>}, such that dθ=ih<sub>α（?）</sub> θ<sup>α</sup>∧θ（?）, where (h<sub>α（?）</sub>) is a positive Hermitian matrix. θ is a pseudo-Einstein structure on M if the Webster-Ricci tensor is a scalar multiple of the Levi form, namely, R<sub>α（?）</sub>=fh<sub>α（?）</sub> for a function on M.展开更多
文摘自Oxford Advanced Learner's Dictionary of Current English(以下简称《牛津》)和Zongman Dictionary of Contem porary English(以下简称《朗曼》)问世以来，它们在上世纪下半叶中一直风行全世界。这两本英语学习者词典的目的在于解决外国研习英语者所面临的特殊困难。
文摘Let （M, θ） be a strictly pseudo-convex CR manifold. Choose an admissible coframe {θ<sup>α</sup>}, such that dθ=ih<sub>α（?）</sub> θ<sup>α</sup>∧θ（?）, where (h<sub>α（?）</sub>) is a positive Hermitian matrix. θ is a pseudo-Einstein structure on M if the Webster-Ricci tensor is a scalar multiple of the Levi form, namely, R<sub>α（?）</sub>=fh<sub>α（?）</sub> for a function on M.
