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Description: Reductio ad absurdum. Theorem *2.01 of [WhiteheadRussell] p. 100. (Contributed by NM, 18-Aug-1993.) (Proof shortened by O'Cat, 21-Nov-2008.) (Proof shortened by Wolf Lammen, 31-Oct-2012.) |
Ref | Expression |
---|---|
pm2.01 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 | . 2 | |
2 | 1, 1 | ja 151 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 |
This theorem is referenced by: bijust 173 pm4.8 353 dtrucor2 3789 ominf 6554 elirr 6786 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-3 7 ax-mp 8 |