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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 7020 nnnninf 7325 nnnninf2 7326 nnnninfeq 7327 nninfisollemne 7330 nninfisol 7332 fodjum 7345 fodju0 7346 fodjuomni 7348 fodjumkv 7359 nninfwlporlemd 7371 nninfwlpor 7373 nninfwlpoimlemg 7374 nninfwlpoimlemginf 7375 nninfwlpoim 7378 nninfinfwlpo 7379 xaddval 10080 0tonninf 10703 1tonninf 10704 nninfinf 10706 sumeq1 11933 summodc 11962 zsumdc 11963 fsum3 11966 isumss 11970 sumsplitdc 12011 prodeq1f 12131 zproddc 12158 fprodseq 12162 nninfctlemfo 12629 pcmpt 12934 pcmpt2 12935 pcfac 12941 lgsval 15752 lgsneg 15772 lgsdilem 15775 lgsdir2 15781 lgsdir 15783 bj-charfunbi 16457 2omap 16645 pw1map 16647 subctctexmid 16652 nninfalllem1 16661 nninfsellemdc 16663 nninfself 16666 nninfsellemeq 16667 nninfsellemqall 16668 nninfsellemeqinf 16669 nninfomni 16672 nninffeq 16673 nnnninfex 16675 dceqnconst 16716 dcapnconst 16717 |
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