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Mirrors > Home > ILE Home > Th. List > pm4.15 | Unicode version |
Description: Theorem *4.15 of [WhiteheadRussell] p. 117. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 18-Nov-2012.) |
Ref | Expression |
---|---|
pm4.15 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con2b 625 | . 2 | |
2 | nan 658 | . 2 | |
3 | 1, 2 | bitr2i 183 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 102 wb 103 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 |
This theorem depends on definitions: df-bi 115 |
This theorem is referenced by: (None) |
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