1 1. P v Q A |- R & S A--> ASSUMPTION PA--> PROVISIONAL ASSUMPTION
2 2. R A
4 3. P--> S A
5 4. Q--> S A
3,5 5. P P
3,5 6. S 3,5--> O
2,3,5 7. R&S 2,6& I
2,3 5 8. P & (R & S) 5,7 & I
2,3,5 9. R&S 8 & 0
2,3 10. P--> (R&S) 5-9--> I
11 11. Q PA
4,11 12. S 4,11-->O
13 13. R PA
4,11,13 14. R&S 12,13 & I
4,11,13 15. Q & (R&S) 11,14 & I
4,11,13 16. R&S 15 & O
4 17. Q--> (R&S) 11-16 --> I
1,2,3,4 18. R&S 1,10,17 VO
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