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Mirrors > Home > MPE Home > Th. List > dfifp5 | Structured version Visualization version Unicode version |
Description: Alternate definition of the conditional operator for propositions. (Contributed by BJ, 2-Oct-2019.) |
Ref | Expression |
---|---|
dfifp5 | if- |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfifp2 1014 | . 2 if- | |
2 | imor 428 | . . 3 | |
3 | 2 | anbi1i 731 | . 2 |
4 | 1, 3 | bitri 264 | 1 if- |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 196 wo 383 wa 384 if-wif 1012 |
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 197 df-or 385 df-an 386 df-ifp 1013 |
This theorem is referenced by: (None) |
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