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Mirrors > Home > NFE Home > Th. List > tbt | Unicode version |
Description: A wff is equivalent to its equivalence with truth. (Contributed by NM, 18-Aug-1993.) (Proof shortened by Andrew Salmon, 13-May-2011.) |
Ref | Expression |
---|---|
tbt.1 |
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Ref | Expression |
---|---|
tbt |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tbt.1 |
. 2
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2 | ibibr 332 |
. . 3
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3 | 2 | pm5.74ri 237 |
. 2
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4 | 1, 3 | ax-mp 5 |
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: tbtru 1324 exists1 2293 reu6 3025 eqv 3565 |
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