Let's talk about the meaning difference of each set, the more detailed the better, {x | x = 1}, {y | (Y-1) & # 178;}, {x = 1},

Let's talk about the meaning difference of each set, the more detailed the better, {x | x = 1}, {y | (Y-1) & # 178;}, {x = 1},

Well, there are three ways to express a set: Wayne diagram, enumeration and description. The description method is used in {x | x = 1}. The representation element of X is x = 1, that is, there is only one element "1" in the set. This set is equivalent to {1} This unit set