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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 7140 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 10263 0tonninf 10897 1tonninf 10898 nninfinf 10900 sumeq1 12145 summodc 12174 zsumdc 12175 fsum3 12178 isumss 12182 sumsplitdc 12223 prodeq1f 12343 zproddc 12370 fprodseq 12374 nninfctlemfo 12841 pcmpt 13150 pcmpt2 13151 pcfac 13157 psrlidmfi 15208 psrridmfi 15209 mvrval 15215 mvrval2 15216 mvrf1fi 15219 prmorcht 16299 lgsval 16345 lgsneg 16365 lgsdilem 16368 lgsdir2 16374 lgsdir 16376 bj-charfunbi 17059 pw1map 17247 subctctexmid 17252 idjudju 17269 nninfalllem1 17274 nninfsellemdc 17276 nninfself 17279 nninfsellemeq 17280 nninfsellemqall 17281 nninfsellemeqinf 17282 nninfomni 17285 nninffeq 17286 nnnninfex 17288 dceqnconst 17334 dcapnconst 17335 |
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