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单词 sets
释义 sets
Collections of objects or elements that have at least one characteristic in common. For example, the set X may consist of all the elements x1, x2, x3, etc. This is written
{x1, x2, x3,…} = X
. A specific element in a set is characterized by x1X, meaning x1 is a member of set X. A subset of set X, say M, would be written MX, i.e. M is contained in X. If x3 is a member of both subsets M and N, then x3∈(MnN), i.e. x3 belongs to the intersection of M and N. MN means the union of M and N. For example, if M consists of {1, 4, 5, 8} and N consists of {2, 3, 4, 5} then
MnN = {4, 5} and MN = {1, 2, 3, 4, 5, 8}
. In the diagram, the rectangle represents the universal set E, circles represent sets or subsets. These diagrams are called Venn diagrams , after John Venn (1834–1923), who invented them.

Sets
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更新时间:2025/6/23 1:23:59