Jeff, All versions of logic, by Peirce and by any logicians before or after Peirce, represent propositions. Induction, abduction, and deduction are operations that relate propositions to one another in various ways. Those operations can be performed in equivaent ways with any notation for logic -- or even with propositions stated in English or any other language. JBD> It is an interesting question: how might one represent abductive inferences in the EG? Short answer: Peirce stated rules of inference for deduction with EGs. He also wrote a great deal about induction and abduction with examples stated in English. To adapt those examples to EGs, translate the English to EGs and then perform the equivalent operations on the EGs. John
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