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一、“或”的理解交集:由所有属于A且属于B的元素构成的集合叫A与B的交集,记作A∩B(读作“A交B”),即:A∩B={x|x∈A,且x∈B}。
A, “or ” understanding of intersection: a collection of elements belonging to A and belonging to B is called the intersection of A and B, denoted as A∩B (read as “A cross B ”), that is: ∩B = {x | x∈A, and x∈B}.