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Mirrors > Home > QLE Home > Th. List > u4lembi | Unicode version |
Description: Non-tollens implication and biconditional. |
Ref | Expression |
---|---|
u4lembi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ud4lem1a 577 | . 2 | |
2 | dfb 94 | . . 3 | |
3 | 2 | ax-r1 35 | . 2 |
4 | 1, 3 | ax-r2 36 | 1 |
Colors of variables: term |
Syntax hints: wb 1 wn 4 tb 5 wo 6 wa 7 wi4 15 |
This theorem was proved from axioms: ax-a1 30 ax-a2 31 ax-a3 32 ax-a4 33 ax-a5 34 ax-r1 35 ax-r2 36 ax-r4 37 ax-r5 38 ax-r3 439 |
This theorem depends on definitions: df-b 39 df-a 40 df-t 41 df-f 42 df-i4 47 df-le1 130 df-le2 131 df-c1 132 df-c2 133 |
This theorem is referenced by: (None) |
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