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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 3627 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐴, 𝐶)) |
| 3 | ifbieq1d.2 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 4 | 3 | ifeq1d 3623 | . 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 1397 ifcif 3605 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-rab 2519 df-v 2804 df-un 3204 df-if 3606 |
| This theorem is referenced by: ctssdclemn0 7309 ctssdc 7312 enumctlemm 7313 iseqf1olemfvp 10772 seq3f1olemqsum 10775 seq3f1oleml 10778 seq3f1o 10779 bcval 11011 swrdval 11229 sumrbdclem 11939 summodclem3 11942 summodclem2a 11943 summodc 11945 zsumdc 11946 fsum3 11949 isumss 11953 isumss2 11955 fsum3cvg2 11956 fsum3ser 11959 fsumcl2lem 11960 fsumadd 11968 sumsnf 11971 fsummulc2 12010 isumlessdc 12058 cbvprod 12120 prodrbdclem 12133 prodmodclem3 12137 prodmodclem2a 12138 prodmodc 12140 zproddc 12141 fprodseq 12145 fprodntrivap 12146 prodssdc 12151 fprodmul 12153 prodsnf 12154 pcmpt 12917 pcmptdvds 12919 elply2 15461 lgsval 15735 lgsfvalg 15736 lgsdir 15766 lgsdilem2 15767 lgsdi 15768 lgsne0 15769 |
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