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Mirrors > Home > NFE Home > Th. List > rb-bijust | Unicode version |
Description: Justification for rb-imdf 1515. (Contributed by Anthony Hart, 17-Aug-2011.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
rb-bijust |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfbi1 184 |
. 2
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2 | imor 401 |
. . . 4
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3 | imor 401 |
. . . . 5
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4 | 3 | notbii 287 |
. . . 4
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5 | 2, 4 | imbi12i 316 |
. . 3
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6 | 5 | notbii 287 |
. 2
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7 | pm4.62 408 |
. . 3
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8 | 7 | notbii 287 |
. 2
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9 | 1, 6, 8 | 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 |
This theorem depends on definitions: df-bi 177 df-or 359 |
This theorem is referenced by: rb-imdf 1515 |
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