Description: Inference associated with the contrapositive of 19.8a . (Contributed by Jeff Hankins, 26-Jul-2009)
Ref | Expression | ||
---|---|---|---|
Hypothesis | nexr.1 | |
|
Assertion | nexr | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nexr.1 | |
|
2 | 19.8a | |
|
3 | 1 2 | mto | |