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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 3624 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐴, 𝐶)) |
| 3 | ifbieq1d.2 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 4 | 3 | ifeq1d 3620 | . 2 ⊢ (𝜑 → if(𝜒, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶)) |
| 5 | 2, 4 | eqtrd 2262 | 1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1395 ifcif 3602 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-rab 2517 df-v 2801 df-un 3201 df-if 3603 |
| This theorem is referenced by: ctssdclemn0 7293 ctssdc 7296 enumctlemm 7297 iseqf1olemfvp 10749 seq3f1olemqsum 10752 seq3f1oleml 10755 seq3f1o 10756 bcval 10988 swrdval 11201 sumrbdclem 11909 summodclem3 11912 summodclem2a 11913 summodc 11915 zsumdc 11916 fsum3 11919 isumss 11923 isumss2 11925 fsum3cvg2 11926 fsum3ser 11929 fsumcl2lem 11930 fsumadd 11938 sumsnf 11941 fsummulc2 11980 isumlessdc 12028 cbvprod 12090 prodrbdclem 12103 prodmodclem3 12107 prodmodclem2a 12108 prodmodc 12110 zproddc 12111 fprodseq 12115 fprodntrivap 12116 prodssdc 12121 fprodmul 12123 prodsnf 12124 pcmpt 12887 pcmptdvds 12889 elply2 15430 lgsval 15704 lgsfvalg 15705 lgsdir 15735 lgsdilem2 15736 lgsdi 15737 lgsne0 15738 |
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