universal set In a particular piece of work, it may be convenient to fix the universal set E, a set to which all the objects to be discussed belong. Then all the sets considered are subsets of E.
universal set
数学辞典收录了4151条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。