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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 10896 seq3f1olemqsum 10899 seq3f1oleml 10902 seq3f1o 10903 bcval 11136 swrdval 11365 sumrbdclem 12088 summodclem3 12091 summodclem2a 12092 summodc 12094 zsumdc 12095 fsum3 12098 isumss 12102 isumss2 12104 fsum3cvg2 12105 fsum3ser 12108 fsumcl2lem 12109 fsumadd 12117 sumsnf 12120 fsummulc2 12159 isumlessdc 12207 cbvprod 12269 prodrbdclem 12282 prodmodclem3 12286 prodmodclem2a 12287 prodmodc 12289 zproddc 12290 fprodseq 12294 fprodntrivap 12295 prodssdc 12300 fprodmul 12302 prodsnf 12303 pcmpt 13066 pcmptdvds 13068 ballotfilemsval 13196 ballotfilemieq 13204 ballotfi 13226 elply2 15712 lgsval 15989 lgsfvalg 15990 lgsdir 16020 lgsdilem2 16021 lgsdi 16022 lgsne0 16023 |
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