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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 3648 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐴, 𝐶)) |
| 3 | ifbieq1d.2 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 4 | 3 | ifeq1d 3644 | . 2 ⊢ (𝜑 → if(𝜒, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶)) |
| 5 | 2, 4 | eqtrd 2267 | 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 3624 |
| 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 2216 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-rab 2531 df-v 2817 df-un 3218 df-if 3625 |
| This theorem is referenced by: ctssdclemn0 7414 ctssdc 7417 enumctlemm 7418 iseqf1olemfvp 10899 seq3f1olemqsum 10902 seq3f1oleml 10905 seq3f1o 10906 bcval 11139 swrdval 11368 sumrbdclem 12092 summodclem3 12095 summodclem2a 12096 summodc 12098 zsumdc 12099 fsum3 12102 isumss 12106 isumss2 12108 fsum3cvg2 12109 fsum3ser 12112 fsumcl2lem 12113 fsumadd 12121 sumsnf 12124 fsummulc2 12163 isumlessdc 12211 cbvprod 12273 prodrbdclem 12286 prodmodclem3 12290 prodmodclem2a 12291 prodmodc 12293 zproddc 12294 fprodseq 12298 fprodntrivap 12299 prodssdc 12304 fprodmul 12306 prodsnf 12307 pcmpt 13070 pcmptdvds 13072 ballotfilemsval 13200 ballotfilemieq 13208 ballotfi 13230 elply2 15730 lgsval 16007 lgsfvalg 16008 lgsdir 16038 lgsdilem2 16039 lgsdi 16040 lgsne0 16041 |
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