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集合set.docx


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A set isa collection of numbers or objects We usually use capital letters to represent sets. E very item within the brackets is called an element (or number) of the set N otation: reads is an element of reads is not an element of is called the empty set and contains no elements reads “P isa subset ofQ and means that every element inP is also an element ofQ”

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  • 时间2016-04-15