Countable vector spaces with recursive operations Part I1

Publisher: Cambridge University Press

E-ISSN: 1943-5886|34|3|363-387

ISSN: 0022-4812

Source: The Journal of Symbolic Logic, Vol.34, Iss.3, 1969-11, pp. : 363-387

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Abstract

We use the word “number” for “nonnegative integer” and “set” for collection of numbers. The set of all numbers is denoted by ε and the empty set by ο. We write ⊂ for the relation of inclusion and ⊆ for that of proper inclusion. If ƒ is a function from a subset of ε into ε, its domain and range are denoted by δƒ and ρƒ respectively. For any collection Γ of entities, card Γ or card (Γ) stands for the cardinality of Γ. The cardinality of the continuum is denoted by c.