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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 3643 | . 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 3641 | . 2 ⊢ (𝜑 → if(𝜒, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷)) |
| 6 | 2, 5 | eqtrd 2265 | 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 3619 |
| 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 2214 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-rab 2529 df-v 2814 df-un 3214 df-if 3620 |
| This theorem is referenced by: updjudhcoinlf 7370 updjudhcoinrg 7371 omp1eom 7385 xaddval 10174 iseqf1olemqval 10858 iseqf1olemqk 10865 seq3f1olemqsum 10871 seqf1oglem2 10878 exp3val 10899 ccatfvalfi 11273 ccatval1 11278 ccatval2 11279 ccatalpha 11294 cvgratz 12211 eucalgval2 12743 ennnfonelemg 13143 ennnfonelem1 13147 mulgval 13828 lgsval 15864 gausslemma2dlem1a 15918 gausslemma2dlem1f1o 15920 gausslemma2dlem2 15922 gausslemma2dlem3 15923 gausslemma2dlem4 15924 vtxvalg 15998 iedgvalg 15999 |
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