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What is wrong with the following natural deduction proof? Line 9: In order to apply an v-elim, both sides of the 'or' must be evaluated
What is wrong with the following natural deduction proof? Line 9: In order to apply an v-elim, both sides of the 'or' must be evaluated and lead to the same conclusion. Line 3: 3 -elim requires an existing variable Line 4: -elim must create a new variable Line 9: v-elim cannot immediately follow an assumption box
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