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Sentences/Prior: sentences are different from what we want to say with them - as well as what we think is different from what we think about.
Sentences/Prior: not about propositions - e.g. "The sentence S is only seemingly about propositions" is itself only seemingly about propositions." (solution: it is a sentence about the sentence) - E.g. "the proposition that the sun is hot, is true" about the sun.
Sentences/Prior: sentences denote nothing, just names - sentence: no relation between two names but between name and predicate that is expressed by the clause - expressing instead denoting - instead of "fear +" that -sentence":"fear that" + sentence - left predicate right connection.
Sentence/PriorVsFrege: sentences denote nothing, not even "truth".
Objects of thought Oxford 1971
Arthur N. Prior
Papers on Time and Tense 2nd Edition Oxford 2003