Zermelo-Fraenkel set theory
(mathematics) An axiomatic system that was proposed in the early 20th century in order to formulate a theory of sets free from paradoxes such as Russell's paradox, and became the standard form of axiomatic set theory.
plural of under-manager
(US, Roman Catholicism, transitive) to issue a detention (to a student)
Having two foramina or perforations
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DiQt（ディクト）
無料
★★★★★★★★★★
