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Ah, with or without the truth table? And whats your take on how to begin?
I'm pretty sure that truth tables are not allowed
I've started by assuming ¬(p v q) and hoping to prove by contradiction (Reductio Ad Absurdum)
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hmm, what is the |-?
have you studied logic before?
because if you've studied logic, then surely you should know what that symbol is...
I have a general idea about logics, from digital electronics. This has to be similar right?
this is propositional logic
is that a \bot?
if it is, then this contradiction can be easily proved by truth table...
truth tables not allowed
Let be .
Show that but that neither nor
(Note: this question is using Propositional logic)
My current attempt is this:
4. Using "OR introduction"
5. Contradiction in lines 2 and 4
6. Derive using Reductio Ad Absurdum
8. Using "OR introduction"
9. Contradiction in lines 2 and 8
10. Derive using Reductio Ad Absurdum
11. Using "AND introduction"