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Mirrors > Home > ILE Home > Th. List > nf4dc | Unicode version |
Description: Variable ![]() ![]() ![]() |
Ref | Expression |
---|---|
nf4dc |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nf2 1647 |
. . 3
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2 | imordc 883 |
. . 3
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3 | 1, 2 | syl5bb 191 |
. 2
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4 | orcom 718 |
. . 3
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5 | alnex 1476 |
. . . 4
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6 | 5 | orbi2i 752 |
. . 3
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7 | 4, 6 | bitr4i 186 |
. 2
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8 | 3, 7 | syl6bb 195 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-gen 1426 ax-ie2 1471 ax-4 1488 ax-ial 1515 |
This theorem depends on definitions: df-bi 116 df-dc 821 df-tru 1335 df-fal 1338 df-nf 1438 |
This theorem is referenced by: (None) |
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