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Mirrors > Home > ILE Home > Th. List > ifeq1 | Unicode version |
Description: Equality theorem for conditional operator. (Contributed by NM, 1-Sep-2004.) (Revised by Mario Carneiro, 8-Sep-2013.) |
Ref | Expression |
---|---|
ifeq1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rabeq 2678 | . . 3 | |
2 | 1 | uneq1d 3229 | . 2 |
3 | dfif6 3476 | . 2 | |
4 | dfif6 3476 | . 2 | |
5 | 2, 3, 4 | 3eqtr4g 2197 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wceq 1331 crab 2420 cun 3069 cif 3474 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-rab 2425 df-v 2688 df-un 3075 df-if 3475 |
This theorem is referenced by: ifeq12 3488 ifeq1d 3489 ifbieq12i 3497 cbvsum 11129 prodeq2w 11325 cbvprod 11327 |
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