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Mirrors > Home > ILE Home > Th. List > pm5.61 | Unicode version |
Description: Theorem *5.61 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 30-Jun-2013.) |
Ref | Expression |
---|---|
pm5.61 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | biorf 699 |
. . 3
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2 | orcom 683 |
. . 3
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3 | 1, 2 | syl6rbb 196 |
. 2
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4 | 3 | pm5.32ri 444 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in2 581 ax-io 666 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: pm5.75 909 excxor 1315 xrnemnf 9309 xrnepnf 9310 |
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