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Proof: (related to "Justification of Subsets and Supersets")

Remark: In particular, a subset can be empty, which is ensured by the axiom of empty set.

q.e.d

| | | | Contributors: bookofproofs | References: [656], [983]


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Bibliography (further reading)

[983] Ebbinghaus, H.-D.: “Einf├╝hrung in die Mengenlehre”, BI Wisschenschaftsverlag, 1994, 3

[656] Hoffmann, Dirk W.: “Grenzen der Mathematik – Eine Reise durch die Kerngebiete der mathematischen Logik”, Spektrum Akademischer Verlag, 2011

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