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2. A reminder of set theory
2.1 Sets
The term ensemble was coined by B. Bolzano ("menge" in German). The concept of abstract sets came into its own at the end of the 19th century with G. Cantor (1895, 1897) (p. 1 of ).
In a non-empty set E, a subset X is a subset of Y if
and Y is then called a superset of X (p. 2 of
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