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Mirrors > Home > NFE Home > Th. List > bianabs | Unicode version |
Description: Absorb a hypothesis into the second member of a biconditional. (Contributed by FL, 15-Feb-2007.) |
Ref | Expression |
---|---|
bianabs.1 |
Ref | Expression |
---|---|
bianabs |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bianabs.1 | . 2 | |
2 | ibar 490 | . 2 | |
3 | 1, 2 | bitr4d 247 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 176 wa 358 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-3 7 ax-mp 8 |
This theorem depends on definitions: df-bi 177 df-an 360 |
This theorem is referenced by: ceqsrexv 2972 opelopab2a 4702 ov 5595 ovg 5601 |
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