Description: A double modus ponens inference. (Contributed by Mario Carneiro, 24-Jan-2013)
Ref | Expression | ||
---|---|---|---|
Hypotheses | mp2b.1 | |
|
mp2b.2 | |
||
mp2b.3 | |
||
Assertion | mp2b | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mp2b.1 | |
|
2 | mp2b.2 | |
|
3 | mp2b.3 | |
|
4 | 1 2 | ax-mp | |
5 | 4 3 | ax-mp | |