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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 3643 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐴, 𝐶)) |
| 3 | ifbieq1d.2 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 4 | 3 | ifeq1d 3639 | . 2 ⊢ (𝜑 → if(𝜒, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶)) |
| 5 | 2, 4 | eqtrd 2265 | 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 3619 |
| 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 2214 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-rab 2529 df-v 2814 df-un 3214 df-if 3620 |
| This theorem is referenced by: ctssdclemn0 7400 ctssdc 7403 enumctlemm 7404 iseqf1olemfvp 10871 seq3f1olemqsum 10874 seq3f1oleml 10877 seq3f1o 10878 bcval 11110 swrdval 11336 sumrbdclem 12059 summodclem3 12062 summodclem2a 12063 summodc 12065 zsumdc 12066 fsum3 12069 isumss 12073 isumss2 12075 fsum3cvg2 12076 fsum3ser 12079 fsumcl2lem 12080 fsumadd 12088 sumsnf 12091 fsummulc2 12130 isumlessdc 12178 cbvprod 12240 prodrbdclem 12253 prodmodclem3 12257 prodmodclem2a 12258 prodmodc 12260 zproddc 12261 fprodseq 12265 fprodntrivap 12266 prodssdc 12271 fprodmul 12273 prodsnf 12274 pcmpt 13037 pcmptdvds 13039 elply2 15592 lgsval 15869 lgsfvalg 15870 lgsdir 15900 lgsdilem2 15901 lgsdi 15902 lgsne0 15903 |
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