**1. The problem statement, all variables and given/known data**
I don't have symbols for negations, so i'll just use the word NOT..

Prove the validity of the sequents below:

NOT ( P -> Q) YIELDS Q-> P

**2. Relevant equations**
Relavent deductions as listed here..

http://en.wikipedia.org/wiki/Propositional_logic
Using things such as ^ elimination/introduction, Modens Ponens,.. etc

**3. The attempt at a solution**
1. NOT ( P -> Q) Premise

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2. NOT Q Assumption

3. NOT NOT P MT 1,2 (added in extra negation from line 1)

4. P NOT NOT Elimination

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5. NOT Q -> P

I"m looking for Q -> P.. which the opposite answer.. i think its something to do with the negations being all wrong.. any help??