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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 10773 seq3f1olemqsum 10776 seq3f1oleml 10779 seq3f1o 10780 bcval 11012 swrdval 11233 sumrbdclem 11943 summodclem3 11946 summodclem2a 11947 summodc 11949 zsumdc 11950 fsum3 11953 isumss 11957 isumss2 11959 fsum3cvg2 11960 fsum3ser 11963 fsumcl2lem 11964 fsumadd 11972 sumsnf 11975 fsummulc2 12014 isumlessdc 12062 cbvprod 12124 prodrbdclem 12137 prodmodclem3 12141 prodmodclem2a 12142 prodmodc 12144 zproddc 12145 fprodseq 12149 fprodntrivap 12150 prodssdc 12155 fprodmul 12157 prodsnf 12158 pcmpt 12921 pcmptdvds 12923 elply2 15465 lgsval 15739 lgsfvalg 15740 lgsdir 15770 lgsdilem2 15771 lgsdi 15772 lgsne0 15773 |
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