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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 3626 | . 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 1397 ifcif 3605 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-11 1554 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-if 3606 |
| This theorem is referenced by: ifbieq1d 3628 ifbieq2d 3630 ifbieq12d 3632 ifandc 3646 ifordc 3647 rabsnif 3738 pw2f1odclem 7019 nnnninf 7324 nnnninf2 7325 nnnninfeq 7326 nninfisollemne 7329 nninfisol 7331 fodjum 7344 fodju0 7345 fodjuomni 7347 fodjumkv 7358 nninfwlporlemd 7370 nninfwlpor 7372 nninfwlpoimlemg 7373 nninfwlpoimlemginf 7374 nninfwlpoim 7377 nninfinfwlpo 7378 xaddval 10079 0tonninf 10701 1tonninf 10702 nninfinf 10704 sumeq1 11915 summodc 11943 zsumdc 11944 fsum3 11947 isumss 11951 sumsplitdc 11992 prodeq1f 12112 zproddc 12139 fprodseq 12143 nninfctlemfo 12610 pcmpt 12915 pcmpt2 12916 pcfac 12922 lgsval 15732 lgsneg 15752 lgsdilem 15755 lgsdir2 15761 lgsdir 15763 bj-charfunbi 16406 2omap 16594 pw1map 16596 subctctexmid 16601 nninfalllem1 16610 nninfsellemdc 16612 nninfself 16615 nninfsellemeq 16616 nninfsellemqall 16617 nninfsellemeqinf 16618 nninfomni 16621 nninffeq 16622 nnnninfex 16624 dceqnconst 16664 dcapnconst 16665 |
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