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Numerology in Topoi
This paper studies numerals (see definition that immediately follows), natural numbers objects and, more generally, free actions, in a topos. A pre-numeral is a poset with a constant, 0, and a unary operation, s, such that: PN1) x ≤ y ⇒ sx ≤ sy PN2) x ≤ sx A numeral is a “minimal” pre-numeral, that is, one such that any s-invariant subobject containing 0 is entire. 1. Lemma. A pre-numeral is a ...
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Copyright © International Union of Crystallography Author(s) of this paper may load this reprint on their own web site or institutional repository provided that this cover page is retained. Republication of this article or its storage in electronic databases other than as specified above is not permitted without prior permission in writing from the IUCr. For further information see http://journ...
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ژورنال
عنوان ژورنال: Nature
سال: 1983
ISSN: 0028-0836,1476-4687
DOI: 10.1038/305672b0