British analytic philosopher who made foundational contributions to the logic of predicates and ethical theory, including the Geach-Frege point about the embedding of moral terms in unasserted contexts.
The Geach-Frege point (Frege-Geach problem): moral terms like 'good' or 'wrong' occur in unasserted contexts (if X is wrong, then Y is wrong) where they cannot express mere emotion — this undermines emotivist and expressivist theories. Developed absolute prohibitions in ethics: certain acts are unconditionally forbidden regardless of consequences.
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