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15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification |
Full Idea: For mathematics, Weyl arrived (by 1917) at a satisfactory list of definition principles: negation, identification of variables, conjunction, disjunction, substitution of constants, and existential quantification over the domain. | |||
From: report of Hermann Weyl (works [1917]) by Shaughan Lavine - Understanding the Infinite V.3 | |||
A reaction: Lavine summarises this as 'first-order logic with parameters'. |