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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 | |
2th.2 |
Ref | Expression |
---|---|
2th |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2th.2 | . . 3 | |
2 | 1 | a1i 9 | . 2 |
3 | 2th.1 | . . 3 | |
4 | 3 | a1i 9 | . 2 |
5 | 2, 4 | impbii 125 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 104 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia2 106 ax-ia3 107 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: trujust 1333 dftru2 1339 bitru 1343 vjust 2682 pwv 3730 int0 3780 0iin 3866 snnex 4364 ruv 4460 fo1st 6048 fo2nd 6049 eqer 6454 ener 6666 rexfiuz 10754 bdth 13018 |
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