If the proposition expressed by a formula were constituted entirely by its role within a formal system, no proposition could be true yet unprovable within that system—contradicting Gödel's result.
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proposition(Used in the context of a semantic theory sensitive to differences in subject matter.)
The content expressed by a sentence, individuated at least in part by the subject matter of the sentence and the contents of its subsentential expressions.
provable within a system(as used in logic and mathematics)
Something that can be proven true using only the rules and axioms (starting assumptions) of a particular formal system—like proving a theorem in geometry using geometry's basic rules.