Let $X$ be a non-empty set. A partition of $X$ is a set $P$ of non-empty subsets of $X,$ which are mutually disjoint.
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| created: 2019-09-08 10:17:36 | modified: 2019-09-08 10:22:50 | by: bookofproofs | references: [983]
[983] Ebbinghaus, H.-D.: “Einführung in die Mengenlehre”, BI Wisschenschaftsverlag, 1994, 3