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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 3492 | . 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 104 = wceq 1331 ifcif 3474 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-11 1484 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-if 3475 |
This theorem is referenced by: ifbieq1d 3494 ifbieq2d 3496 ifbieq12d 3498 ifandc 3508 fodjum 7018 fodju0 7019 fodjuomni 7021 nnnninf 7023 fodjumkv 7034 xaddval 9628 0tonninf 10212 1tonninf 10213 sumeq1 11124 summodc 11152 zsumdc 11153 fsum3 11156 isumss 11160 sumsplitdc 11201 prodeq1f 11321 subctctexmid 13196 nninfalllemn 13202 nninfalllem1 13203 nninfsellemdc 13206 nninfself 13209 nninfsellemeq 13210 nninfsellemqall 13211 nninfsellemeqinf 13212 nninfomni 13215 nninffeq 13216 |
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