Hereditarily finite set (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hereditarily finite set" in English language version.

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Omodeo, Eugenio G.; Policriti, Alberto; Tomescu, Alexandru I. (2017). "3.3: The Ackermann encoding of hereditarily finite sets". On Sets and Graphs: Perspectives on Logic and Combinatorics. Springer. pp. 70–71. doi:10.1007/978-3-319-54981-1. ISBN 978-3-319-54980-4. MR 3558535.

Ackermann, Wilhelm (1937). "Die Widerspruchsfreiheit der allgemeinen Mengenlehre". Mathematische Annalen. 114: 305–315. doi:10.1007/bf01594179. S2CID 120576556. Retrieved 2012-01-09.
Kirby, Laurence (2009). "Finitary Set Theory". Notre Dame Journal of Formal Logic. 50 (3): 227–244. doi:10.1215/00294527-2009-009.
Omodeo, Eugenio G.; Policriti, Alberto; Tomescu, Alexandru I. (2017). "3.3: The Ackermann encoding of hereditarily finite sets". On Sets and Graphs: Perspectives on Logic and Combinatorics. Springer. pp. 70–71. doi:10.1007/978-3-319-54981-1. ISBN 978-3-319-54980-4. MR 3558535.

"hereditarily finite set". nLab. January 2023. Retrieved January 28, 2023. The set of all (well-founded) hereditarily finite sets (which is infinite, and not hereditarily finite itself) is written $V_{\omega }$ to show its place in the von Neumann hierarchy of pure sets.