The foundational concept of mathematics is "set".
In mathematics, a set is a collection of distinct elements. The elements that make up a set can be any kind of things: people, letters of the alphabet, numbers, points in space, lines, other geometrical shapes, variables, or even other sets. Two sets are equal if and only if they have precisely the same elements.
Sets are ubiquitous in modern mathematics. The subject called set theory is part of the foundations of mathematics.
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