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Theorem ifbieq12d 3498
 Description: Equivalence deduction for conditional operators. (Contributed by Jeff Madsen, 2-Sep-2009.)
Hypotheses
Ref Expression
ifbieq12d.1 (𝜑 → (𝜓𝜒))
ifbieq12d.2 (𝜑𝐴 = 𝐶)
ifbieq12d.3 (𝜑𝐵 = 𝐷)
Assertion
Ref Expression
ifbieq12d (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))

Proof of Theorem ifbieq12d
StepHypRef Expression
1 ifbieq12d.1 . . 3 (𝜑 → (𝜓𝜒))
21ifbid 3493 . 2 (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐴, 𝐵))
3 ifbieq12d.2 . . 3 (𝜑𝐴 = 𝐶)
4 ifbieq12d.3 . . 3 (𝜑𝐵 = 𝐷)
53, 4ifeq12d 3491 . 2 (𝜑 → if(𝜒, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))
62, 5eqtrd 2172 1 (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))
 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-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  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-clel 2135  df-nfc 2270  df-rab 2425  df-v 2688  df-un 3075  df-if 3475 This theorem is referenced by:  updjudhcoinlf  6965  updjudhcoinrg  6966  omp1eom  6980  xaddval  9635  iseqf1olemqval  10267  iseqf1olemqk  10274  seq3f1olemqsum  10280  exp3val  10302  cvgratz  11308  eucalgval2  11741  ennnfonelemg  11923  ennnfonelem1  11927  ressid2  12028  ressval2  12029
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