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Single Idea 8993

[filed under theme 6. Mathematics / C. Sources of Mathematics / 6. Logicism / a. Early logicism ]

Full Idea

To claim that mathematical truths are conventional in the sense of following logically from definitions is the claim that mathematics is a part of logic.

Gist of Idea

If mathematics follows from definitions, then it is conventional, and part of logic

Source

Willard Quine (Truth by Convention [1935], p.79)

Book Ref

Quine,Willard: 'Ways of Paradox and other essays' [Harvard 1976], p.79


A Reaction

Quine is about to attack logic as convention, so he is endorsing the logicist programme (despite his awareness of Gödel), but resisting the full Wittgenstein conventionalist picture.


The 10 ideas from 'Truth by Convention'

Logic needs general conventions, but that needs logic to apply them to individual cases [Quine, by Rey]
Claims that logic and mathematics are conventional are either empty, uninteresting, or false [Quine]
Logic isn't conventional, because logic is needed to infer logic from conventions [Quine]
If a convention cannot be communicated until after its adoption, what is its role? [Quine]
Quine quickly dismisses If-thenism [Quine, by Musgrave]
If mathematics follows from definitions, then it is conventional, and part of logic [Quine]
If analytic geometry identifies figures with arithmetical relations, logicism can include geometry [Quine]
Definition by words is determinate but relative; fixing contexts could make it absolute [Quine]
If if time is money then if time is not money then time is money then if if if time is not money... [Quine]
There are four different possible conventional accounts of geometry [Quine]