British philosopher who developed anti-realism — the meaning of a statement is given by its assertibility conditions, not its truth conditions — and produced the authoritative scholarly interpretation of Frege.
Semantic anti-realism: if understanding a statement consists in knowing its truth conditions, and truth transcends all possible evidence, then understanding cannot be fully manifested in behavior — we should replace truth-conditional with assertibility-conditional semantics. This supports intuitionistic logic for mathematics and anti-realism about the past.
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