Question: Solution please (a) Explain what are the differences, if any, between a structure of L2 (the language of predicate logic) and a structure of L=

Solution please
(a) Explain what are the differences, if any, between a structure of L2 (the language of predicate logic) and a structure of L= (the language of predicate logic with identity). (b) Let I be a set of sentences of Li (the language of propositional logic) and let o be a sentence of L1, respectively. Define what it is for I and o to be jointly semantically inconsistent. Explain why the argument from I to - is valid if I and o are jointly semantically inconsistent
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