**Set (mathematics) - Wikipedia**
https://en.wikipedia.org/wiki/Set_(mathematics)

Mathematical texts commonly denote sets by capital letters in italic, such as A, B, C. A set may also be called a collection or family, especially when its elements are themselves sets. Roster or enumeration notation defines a set by listing its elements between curly brackets, separated by commas: A = {4, 2, 1, 3} B = {blue, white, red}.In a set, all that matters is whether each element is in it or not, so the ordering of the elements …

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