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| Mirrors > Home > ILE Home > Th. List > ifbieq12d | GIF version | ||
| Description: Equivalence deduction for conditional operators. (Contributed by Jeff Madsen, 2-Sep-2009.) |
| Ref | Expression |
|---|---|
| ifbieq12d.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
| ifbieq12d.2 | ⊢ (𝜑 → 𝐴 = 𝐶) |
| ifbieq12d.3 | ⊢ (𝜑 → 𝐵 = 𝐷) |
| Ref | Expression |
|---|---|
| ifbieq12d | ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ifbieq12d.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
| 2 | 1 | ifbid 3646 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐴, 𝐵)) |
| 3 | ifbieq12d.2 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐶) | |
| 4 | ifbieq12d.3 | . . 3 ⊢ (𝜑 → 𝐵 = 𝐷) | |
| 5 | 3, 4 | ifeq12d 3644 | . 2 ⊢ (𝜑 → if(𝜒, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷)) |
| 6 | 2, 5 | eqtrd 2267 | 1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1398 ifcif 3622 |
| 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 3217 df-if 3623 |
| This theorem is referenced by: updjudhcoinlf 7373 updjudhcoinrg 7374 omp1eom 7388 xaddval 10184 iseqf1olemqval 10869 iseqf1olemqk 10876 seq3f1olemqsum 10882 seqf1oglem2 10889 exp3val 10910 ccatfvalfi 11288 ccatval1 11293 ccatval2 11294 ccatalpha 11309 cvgratz 12226 eucalgval2 12758 ennnfonelemg 13175 ennnfonelem1 13179 mulgval 13860 lgsval 15926 gausslemma2dlem1a 15980 gausslemma2dlem1f1o 15982 gausslemma2dlem2 15984 gausslemma2dlem3 15985 gausslemma2dlem4 15986 vtxvalg 16060 iedgvalg 16061 |
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