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.

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Berka I 121
Definition 1/One/Number/Logical form/Hilbert:

1(F) : (Ex)[F(x) & (y)(F(y) > ≡ (x,y)].

Hilbert: "There is an x for which F(x) exists, and every y for which F(y) exists is identical with this x".

Definition 2/two/number/logical form/Hilbert:

2(F) :(Ex)(Ey) {~≡(x,y) & F(x) & F(y) & (z)[F(z) > ≡ (x,z) v ≡ (y,z)]}.

I 122
"There are two different x and y to which F applies, and every z for which F(z) exists is identical with x or y".

Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution.

Brk I
K. Berka/L. Kreiser
Logik Texte Berlin 1983

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Ed. Martin Schulz, access date 2018-04-20