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Mirrors > Home > NFE Home > Th. List > 3bitr4d | Unicode version |
Description: Deduction from transitivity of biconditional. Useful for converting conditional definitions in a formula. (Contributed by NM, 18-Oct-1995.) |
Ref | Expression |
---|---|
3bitr4d.1 |
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3bitr4d.2 |
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3bitr4d.3 |
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Ref | Expression |
---|---|
3bitr4d |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3bitr4d.2 |
. 2
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2 | 3bitr4d.1 |
. . 3
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3 | 3bitr4d.3 |
. . 3
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4 | 2, 3 | bitr4d 247 |
. 2
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5 | 1, 4 | bitrd 244 |
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 |
This theorem is referenced by: sbcom 2089 sbcom2 2114 r19.12sn 3789 lefinlteq 4463 eqtfinrelk 4486 tfinlefin 4502 opbrop 4841 fvopab3g 5386 unpreima 5408 inpreima 5409 respreima 5410 fconst5 5455 isotr 5495 ncseqnc 6128 |
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