Church's own Logic of Sense and Denotation (Alternative (0)) individuates propositions by synonymous isomorphism, not mere constituent difference, blocking the diagonal construction.

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Church(in the history of logic and computation): Alonzo Church (1903-1995), an American logician and mathematician who created formal systems to define what problems can be solved by mathematical procedures.
Individuates(God individuates each monad): The act of making something distinct and separate as its own unique thing.
Logic of Sense and Denotation(as Church's specific logical theory being described): A system in logic that carefully distinguishes between what sentences mean and what they refer to—a framework for understanding how language connects meaning to reality.
Synonymous isomorphism(as the method for telling propositions apart): A fancy way of saying two things have the same meaning and structure—they say the same thing in the same logical form, even if they use different words.

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