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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 3630 | . 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 1398 ifcif 3607 |
| 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-11 1555 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-if 3608 |
| This theorem is referenced by: ifbieq1d 3632 ifbieq2d 3634 ifbieq12d 3636 ifandc 3650 ifordc 3651 rabsnif 3742 suppsnopdc 6428 pw2f1odclem 7063 nnnninf 7368 nnnninf2 7369 nnnninfeq 7370 nninfisollemne 7373 nninfisol 7375 fodjum 7388 fodju0 7389 fodjuomni 7391 fodjumkv 7402 nninfwlporlemd 7414 nninfwlpor 7416 nninfwlpoimlemg 7417 nninfwlpoimlemginf 7418 nninfwlpoim 7421 nninfinfwlpo 7422 xaddval 10124 0tonninf 10748 1tonninf 10749 nninfinf 10751 sumeq1 11978 summodc 12007 zsumdc 12008 fsum3 12011 isumss 12015 sumsplitdc 12056 prodeq1f 12176 zproddc 12203 fprodseq 12207 nninfctlemfo 12674 pcmpt 12979 pcmpt2 12980 pcfac 12986 lgsval 15806 lgsneg 15826 lgsdilem 15829 lgsdir2 15835 lgsdir 15837 bj-charfunbi 16510 2omap 16698 pw1map 16700 subctctexmid 16705 nninfalllem1 16717 nninfsellemdc 16719 nninfself 16722 nninfsellemeq 16723 nninfsellemqall 16724 nninfsellemeqinf 16725 nninfomni 16728 nninffeq 16729 nnnninfex 16731 dceqnconst 16776 dcapnconst 16777 |
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