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Alex Rivera
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I have the following Isabelle goal: lemma "⟦ if foo then a ≠ a else b ≠ b ⟧ ⟹ False" None of the tactics simp , fast , clarsimp , blast , fastforce , etc. make any progress on the goal, despite it being quite simple. Why doesn't Isabelle just simplify the body of the if construct so that both "a ≠ a" and "b ≠ b" become False , and hence solve the goal?
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