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Logic

The branch of philosophy that treats the forms and laws of thought and reasoning. It is the systematic study of the principles of valid inference and correct argument.

Logical Positivism

A 20th-century philosophical movement that held that only statements that are verifiable through direct observation or logical proof are meaningful. It rejected metaphysical and ethical statements as...

Non-Cognitivism

The meta-ethical view that moral statements do not express propositions and thus cannot be true or false. Examples include Emotivism (expressing emotion) and Prescriptivism (giving commands).

Verification Principle

A criterion of meaning used by Logical Positivists, stating that a statement is meaningful only if it is either analytic (true by definition) or empirically verifiable through sense experience.