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Theorem ifbieq12d 3598
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 3593 . 2 (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐴, 𝐵))
3 ifbieq12d.2 . . 3 (𝜑𝐴 = 𝐶)
4 ifbieq12d.3 . . 3 (𝜑𝐵 = 𝐷)
53, 4ifeq12d 3591 . 2 (𝜑 → if(𝜒, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))
62, 5eqtrd 2239 1 (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))
Colors of variables: wff set class
Syntax hints:  wi 4  wb 105   = wceq 1373  ifcif 3572
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 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-ext 2188
This theorem depends on definitions:  df-bi 117  df-tru 1376  df-nf 1485  df-sb 1787  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-rab 2494  df-v 2775  df-un 3171  df-if 3573
This theorem is referenced by:  updjudhcoinlf  7189  updjudhcoinrg  7190  omp1eom  7204  xaddval  9974  iseqf1olemqval  10652  iseqf1olemqk  10659  seq3f1olemqsum  10665  seqf1oglem2  10672  exp3val  10693  ccatfvalfi  11056  ccatval1  11061  ccatval2  11062  cvgratz  11887  eucalgval2  12419  ennnfonelemg  12818  ennnfonelem1  12822  mulgval  13502  lgsval  15525  gausslemma2dlem1a  15579  gausslemma2dlem1f1o  15581  gausslemma2dlem2  15583  gausslemma2dlem3  15584  gausslemma2dlem4  15585  vtxvalg  15659  iedgvalg  15660
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