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A set of postulates for abstract geometry expressed in terms of the simple relation of inclusion. (English) JFM 44.0082.03
Proc. 5. Intern. Math. Congr. 2, 466-470 (1913).
Die Hauptresultate aus der gleichbetitelten Abhandlung in Math. Ann. 73, 522-559 (Referat in diesem Bande, Abschnitt VIII, Kap. 1).