VK 登录 注册Business Idioms in Use Part 03 - Business English / Vocabulary lesson 4人看过АнглийскийязыквУльяновске.ЯзыковойЦентрАВС 已添加 2015 2月 24 Business Idioms in use Part 03 - Business English / Vocabulary Lessonhttp://www....
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and where V denotes the universe of all values of all types that can be used in the system. We let Ruu′={(mu′,1,v1), . . . , (mu′,k,vk)} denote the set of ratings of a user u′ performed by u. We use R:={Ruu′}u,u′εU to denote the set of all ratings. A ...
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