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The argument that expressivism fails because certain statements lack moral positions was derived from this man's distinction between content and assertoric force, and is an objection named for this man and Geach. This thinker's development was divided into six eras by Michael Dummet, who wrote a book on this man subtitled "Philosophy of Language." One of his works points out the invariance of meaning in the sentence "Copernicus believed that the planetary orbits are circles" when changing subordinate clauses, and points out one "may not always say 'Venus' in place of 'morning star.' For 10 points, name this German philosopher who argued the terms of a language need both denotation and sense in his paper "On Sense and Reference."
The argument that expressivism fails because certain statements lack moral positions was derived from this man's distinction between content and assertoric force, and is an objection named for this man and Geach.
Gottlob {Frege}