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...ems connected to chess were known of for hundreds of years. In 1913, Ernst Zermelo used it as a basis for his theory of game strategies, which is considered a

...class is too large to be a set in the usual [[Zermelo–Fraenkel set theory|Zermelo–Fraenkel]] (ZF) formalization of set theory. But this is not a serious d ...alence class of well-ordered sets. This definition must be abandoned in [[Zermelo-Fraenkel set theory|ZF]] and related systems of [[axiomatic set theory]] be

...irce's. To cite another example, [[Ernst Zermelo|Zermelo]] presented his [[Zermelo set theory|axiom]]s for [[set theory]] in Peirce–Schröder notation, and ...be read as the first (primitive) [[axiomatic set theory]], anticipating [[Zermelo]] by about two decades.

* '''[http://en.wikipedia.org/wiki/Zermelo_set_theory Zermelo set theory]''' Viewed [http://stats.grok.se/en/200809/Zermelo_set_theory 73

| Zermelo, Zermelo-Fraenkel, Bernays, and Bernays-Morse. The first | Zermelo set theory is a subtheory of Zermelo-Fraenkel, and Bernays

...be read as the first (primitive) [[axiomatic set theory]], anticipating [[Zermelo]] by about two decades.