学科分类
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143 个结果
  • 简介:Opticallyactive(R)-(+)-2,2’-bis(2-trifluoro-4-aminophenoxy)-1,1’-binaphthylwaspreparedfrom1,1’-bi-2-naphthol.Theopticallyactivearomaticpolyimidewasalsosuccessfullysynthesized.Thisnewpolymerhasgoodsolubility,thermalstabilityetc.Itsspecificrotationwasfoundtobe+174°,anditschiropticalpropertywasalsostudied.

  • 标签: Optical ACTIVITY 1 1′-Bi-2-naphthol POLYIMIDE
  • 简介:证明了对于一个n-维赋范空间X,如果b#=2n-1,则它一定包含一个与(R^n-1,‖‖∞)等距同构的子空间.

  • 标签: 球覆盖 Banach空间 暴露点