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|Logical Form||A propos II 79
Truth conditions/logical form/Nozick (s): indicated by biconditional - "S is true ↔ ___" - ("iff.") - ((s) However, the truth conditions are only left to right - "so that the sentence is true ... ") - ((s) reverse direction: e.g. "blueness condition": for this flower to be blue, the sentence "the flower is blue" must be true.
Philosophical Explanations Oxford 1981
The Nature of Rationality 1994