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Sets are just collections of things. A set is defined by the things that belong to it- that is if you have two sets A and B and everything that belongs to A belongs to B and everything that belongs to B belongs to A then A and B are actually the same set. An important example is the empty set - which by definition contains nothing. There is only one empty set.

The things that belong to a set are calle its elements

There are different ways of defining sets. You can define them by listing their elements, or you can define them by giving one or more properties that uniquely define the elements that belong to the set.

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โˆ™ 2014-06-10 14:51:21
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Q: What is the meaning of sets in mathematics?
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