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Mirrors > Home > NFE Home > Th. List > nf4 | Unicode version |
Description: Variable ![]() ![]() ![]() |
Ref | Expression |
---|---|
nf4 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nf2 1866 |
. 2
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2 | imor 401 |
. 2
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3 | orcom 376 |
. . 3
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4 | alnex 1543 |
. . . 4
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5 | 4 | orbi2i 505 |
. . 3
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6 | 3, 5 | bitr4i 243 |
. 2
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7 | 1, 2, 6 | 3bitri 262 |
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 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-6 1729 ax-11 1746 |
This theorem depends on definitions: df-bi 177 df-or 359 df-ex 1542 df-nf 1545 |
This theorem is referenced by: (None) |
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