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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 3661 | . 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 |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ifcif 3638 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-if 3639 |
| This theorem is used by: ifbieq1d 3663 ifbieq2d 3665 ifbieq12d 3667 ifandc 3681 ifordc 3682 rabsnif 3778 suppsnopdc 6494 pw2f1odclem 7138 2omap 7324 nnnninf 7472 nnnninf2 7473 nnnninfeq 7474 nninfisollemne 7477 nninfisol 7479 fodjum 7492 fodju0 7493 fodjuomni 7495 fodjumkv 7506 nninfwlporlemd 7518 nninfwlpor 7520 nninfwlpoimlemg 7521 nninfwlpoimlemginf 7522 nninfwlpoim 7525 nninfinfwlpo 7526 indval 9305 indfval 9308 xaddval 10264 0tonninf 10898 1tonninf 10899 nninfinf 10901 sumeq1 12146 summodc 12175 zsumdc 12176 fsum3 12179 isumss 12183 sumsplitdc 12224 prodeq1f 12344 zproddc 12371 fprodseq 12375 nninfctlemfo 12842 pcmpt 13151 pcmpt2 13152 pcfac 13158 psrlidmfi 15199 psrridmfi 15200 prmorcht 16282 lgsval 16328 lgsneg 16348 lgsdilem 16351 lgsdir2 16357 lgsdir 16359 bj-charfunbi 17042 pw1map 17230 subctctexmid 17235 idjudju 17252 nninfalllem1 17257 nninfsellemdc 17259 nninfself 17262 nninfsellemeq 17263 nninfsellemqall 17264 nninfsellemeqinf 17265 nninfomni 17268 nninffeq 17269 nnnninfex 17271 dceqnconst 17317 dcapnconst 17318 |
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