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| Mirrors > Home > ILE Home > Th. List > ifbid | GIF version | ||
| Description: Equivalence deduction for conditional operators. (Contributed by NM, 18-Apr-2005.) |
| Ref | Expression |
|---|---|
| ifbid.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
| Ref | Expression |
|---|---|
| ifbid | ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐴, 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ifbid.1 | . 2 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
| 2 | ifbi 3624 | . 2 ⊢ ((𝜓 ↔ 𝜒) → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐴, 𝐵)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐴, 𝐵)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1395 ifcif 3603 |
| 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-11 1552 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-if 3604 |
| This theorem is referenced by: ifbieq1d 3626 ifbieq2d 3628 ifbieq12d 3630 ifandc 3644 ifordc 3645 rabsnif 3736 pw2f1odclem 7015 nnnninf 7316 nnnninf2 7317 nnnninfeq 7318 nninfisollemne 7321 nninfisol 7323 fodjum 7336 fodju0 7337 fodjuomni 7339 fodjumkv 7350 nninfwlporlemd 7362 nninfwlpor 7364 nninfwlpoimlemg 7365 nninfwlpoimlemginf 7366 nninfwlpoim 7369 nninfinfwlpo 7370 xaddval 10070 0tonninf 10692 1tonninf 10693 nninfinf 10695 sumeq1 11906 summodc 11934 zsumdc 11935 fsum3 11938 isumss 11942 sumsplitdc 11983 prodeq1f 12103 zproddc 12130 fprodseq 12134 nninfctlemfo 12601 pcmpt 12906 pcmpt2 12907 pcfac 12913 lgsval 15723 lgsneg 15743 lgsdilem 15746 lgsdir2 15752 lgsdir 15754 bj-charfunbi 16342 2omap 16530 pw1map 16532 subctctexmid 16537 nninfalllem1 16546 nninfsellemdc 16548 nninfself 16551 nninfsellemeq 16552 nninfsellemqall 16553 nninfsellemeqinf 16554 nninfomni 16557 nninffeq 16558 nnnninfex 16560 dceqnconst 16600 dcapnconst 16601 |
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