Description: Standard propositional axiom derived from Lukasiewicz axioms. (Contributed by NM, 22-Dec-2002) (Proof modification is discouraged.) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | ax2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | luklem7 | ||
2 | luklem8 | ||
3 | luklem6 | ||
4 | luklem8 | ||
5 | 3 4 | ax-mp | |
6 | 2 5 | luklem1 | |
7 | 1 6 | luklem1 |