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Ideas for 'Writing the Book of the World', 'On the Nature of Acquaintance' and 'Epistemology'

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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

15019	Define logical constants by role in proofs, or as fixed in meaning, or as topic-neutral [Sider]
	Full Idea: Some say that logical constants are those expressions that are defined by their proof-theoretic roles, others that they are the expressions whose semantic values are permutation-invariant, and still others that they are the topic-neutral expressions.
	From: Theodore Sider (Writing the Book of the World [2011], 10.3)
	A reaction: [He cites MacFarlane 2005 as giving a survey of this]