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Mirrors > Home > NFE Home > Th. List > rb-ax1 | Unicode version |
Description: The first 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-ax1 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orim2 814 |
. . 3
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2 | imor 401 |
. . 3
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3 | imor 401 |
. . 3
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4 | 1, 2, 3 | 3imtr3i 256 |
. 2
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5 | 4 | imori 402 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() |
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 177 df-or 359 df-an 360 |
This theorem is referenced by: rbsyl 1521 rblem1 1522 rblem2 1523 rblem4 1525 re2luk1 1530 |
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