Set theory
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Set theory is a theory used in mathematics. It deals with sets, which are groups of various objects.
[edit] History
The reason why set theory was made is that groups of objects can cause problems if you work with them without explaining them better. It was made by people like Bertrand Russell.
[edit] Theory
Set theory begins by giving some examples of things that are sets. Then it gives rules with which you can make other sets from the already known sets. Groups of objects that are not sets are called classes. It is possible to do mathematics using only sets, rather than classes, so that the problems that classes cause in mathematics do not occur.
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