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Notice that the definition doesn’t mention any order among the set elements. The order in which set elements are listed is not important. The formal notation for listing set elements uses curly brackets: {a, b, c}. Because order has no relevance, you can express the same set as {b, a, c} or {b, c, a}.


Cover of Microsoft® SQL Server® 2012 T-SQL Fundamentals


Order does not matter in Cantor's definition