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Mirrors > Home > MPE Home > Th. List > rb-ax4 | Structured version Visualization version Unicode version |
Description: The fourth of four axioms in the Russell-Bernays axiom system. (Contributed by Anthony Hart, 13-Aug-2011.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
rb-ax4 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm1.2 535 | . . . 4 | |
2 | 1 | con3i 150 | . . 3 |
3 | 2 | con1i 144 | . 2 |
4 | 3 | orri 391 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wo 383 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 197 df-or 385 |
This theorem is referenced by: rblem4 1685 rblem5 1686 rblem6 1687 re2luk1 1690 re2luk2 1691 re2luk3 1692 |
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