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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 3623 | . 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 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-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 3603 |
| This theorem is referenced by: ifbieq1d 3625 ifbieq2d 3627 ifbieq12d 3629 ifandc 3643 ifordc 3644 pw2f1odclem 7003 nnnninf 7304 nnnninf2 7305 nnnninfeq 7306 nninfisollemne 7309 nninfisol 7311 fodjum 7324 fodju0 7325 fodjuomni 7327 fodjumkv 7338 nninfwlporlemd 7350 nninfwlpor 7352 nninfwlpoimlemg 7353 nninfwlpoimlemginf 7354 nninfwlpoim 7357 nninfinfwlpo 7358 xaddval 10053 0tonninf 10674 1tonninf 10675 nninfinf 10677 sumeq1 11881 summodc 11909 zsumdc 11910 fsum3 11913 isumss 11917 sumsplitdc 11958 prodeq1f 12078 zproddc 12105 fprodseq 12109 nninfctlemfo 12576 pcmpt 12881 pcmpt2 12882 pcfac 12888 lgsval 15698 lgsneg 15718 lgsdilem 15721 lgsdir2 15727 lgsdir 15729 bj-charfunbi 16229 2omap 16418 pw1map 16420 subctctexmid 16425 nninfalllem1 16434 nninfsellemdc 16436 nninfself 16439 nninfsellemeq 16440 nninfsellemqall 16441 nninfsellemeqinf 16442 nninfomni 16445 nninffeq 16446 nnnninfex 16448 dceqnconst 16488 dcapnconst 16489 |
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