Description: Negation inferred from embedded conjunct. (Contributed by NM, 20-Aug-1993) (Proof shortened by Wolf Lammen, 25-Nov-2012)
Ref | Expression | ||
---|---|---|---|
Assertion | pclem6 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ibar | |
|
2 | nbbn | |
|
3 | 1 2 | sylib | |
4 | 3 | con2i | |