Description: Step 3 of Meredith's proof of Lukasiewicz axioms from his sole axiom. (The step numbers refer to Meredith's original paper.) (Contributed by NM, 14-Dec-2002) (Proof modification is discouraged.) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | merlem1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | meredith | ||
2 | meredith | ||
3 | 1 2 | ax-mp | |
4 | meredith | ||
5 | 3 4 | ax-mp |