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Mirrors > Home > ILE Home > Th. List > 2th | Unicode version |
Description: Two truths are equivalent. (Contributed by NM, 18-Aug-1993.) |
Ref | Expression |
---|---|
2th.1 |
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2th.2 |
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Ref | Expression |
---|---|
2th |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2th.2 |
. . 3
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2 | 1 | a1i 9 |
. 2
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3 | 2th.1 |
. . 3
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4 | 3 | a1i 9 |
. 2
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5 | 2, 4 | impbii 126 |
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-ia2 107 ax-ia3 108 |
This theorem depends on definitions: df-bi 117 |
This theorem is referenced by: trujust 1355 dftru2 1361 bitru 1365 vjust 2740 pwv 3810 int0 3860 0iin 3947 snnex 4450 ruv 4551 fo1st 6160 fo2nd 6161 eqer 6569 ener 6781 rexfiuz 11000 bdth 14668 |
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