Question: Consider the following reduction ad absurdum proof in propositional logic. The justification lines (to the right) are missing. Fill in the blanks. 1. A ~B

Consider the following reduction ad absurdum proof in propositional logic. The justification lines (to the right) are missing. Fill in the blanks.

1. A ~B Premise

2.~B (C . B) Premise

3. ~C v ~B Premise

4. APremise / Show X

5.~X Assumption for purposes of indirect proof

6. ~B ___________

7. ~(C . B) ___________

8. B ___________

9. ~A ___________

10. A . ~A ___________

11. ~X (A . ~A)___________

12. ~ (A . ~A) ___________

13. X___________

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