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| Mirrors > Home > ILE Home > Th. List > ifbieq1d | GIF version | ||
| Description: Equivalence/equality deduction for conditional operators. (Contributed by JJ, 25-Sep-2018.) |
| Ref | Expression |
|---|---|
| ifbieq1d.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
| ifbieq1d.2 | ⊢ (𝜑 → 𝐴 = 𝐵) |
| Ref | Expression |
|---|---|
| ifbieq1d | ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ifbieq1d.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
| 2 | 1 | ifbid 3631 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐴, 𝐶)) |
| 3 | ifbieq1d.2 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 4 | 3 | ifeq1d 3627 | . 2 ⊢ (𝜑 → if(𝜒, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶)) |
| 5 | 2, 4 | eqtrd 2264 | 1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1398 ifcif 3607 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-rab 2520 df-v 2805 df-un 3205 df-if 3608 |
| This theorem is referenced by: ctssdclemn0 7352 ctssdc 7355 enumctlemm 7356 iseqf1olemfvp 10816 seq3f1olemqsum 10819 seq3f1oleml 10822 seq3f1o 10823 bcval 11055 swrdval 11276 sumrbdclem 11999 summodclem3 12002 summodclem2a 12003 summodc 12005 zsumdc 12006 fsum3 12009 isumss 12013 isumss2 12015 fsum3cvg2 12016 fsum3ser 12019 fsumcl2lem 12020 fsumadd 12028 sumsnf 12031 fsummulc2 12070 isumlessdc 12118 cbvprod 12180 prodrbdclem 12193 prodmodclem3 12197 prodmodclem2a 12198 prodmodc 12200 zproddc 12201 fprodseq 12205 fprodntrivap 12206 prodssdc 12211 fprodmul 12213 prodsnf 12214 pcmpt 12977 pcmptdvds 12979 elply2 15526 lgsval 15803 lgsfvalg 15804 lgsdir 15834 lgsdilem2 15835 lgsdi 15836 lgsne0 15837 |
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