Philosophy Lexicon of Arguments

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One, number 1: in modern logic it is not possible to introduce the number one directly. It must be introduced indirectly, via existential quantification ("for at least one x ...") and universal quantification ("for all x ..."). In addition, identity is needed. See also definition, identity, logic, elementary logic, number theory, numbers.

Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.
Author Item    More concepts for author
Frege, Gottlob One (Number 1)   Frege, Gottlob
Hilbert, D. One (Number 1)   Hilbert, D.
Lewis, David One (Number 1)   Lewis, David
Prior, Arthur One (Number 1)   Prior, Arthur
Schröder, E. One (Number 1)   Schröder, E.

Ed. Martin Schulz, access date 2017-10-20