Theorem ifbieq12d 3503

Description: Equivalence deduction for conditional operators. (Contributed by Jeff Madsen, 2-Sep-2009.)

Hypotheses

Ref	Expression
ifbieq12d.1	⊢ (𝜑 → (𝜓 ↔ 𝜒))
ifbieq12d.2	⊢ (𝜑 → 𝐴 = 𝐶)
ifbieq12d.3	⊢ (𝜑 → 𝐵 = 𝐷)

Assertion

Ref	Expression
ifbieq12d	⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))

Proof of Theorem ifbieq12d

Step	Hyp	Ref	Expression
1		ifbieq12d.1	. . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒))
2	1	ifbid 3498	. 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐴, 𝐵))
3		ifbieq12d.2	. . 3 ⊢ (𝜑 → 𝐴 = 𝐶)
4		ifbieq12d.3	. . 3 ⊢ (𝜑 → 𝐵 = 𝐷)
5	3, 4	ifeq12d 3496	. 2 ⊢ (𝜑 → if(𝜒, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))
6	2, 5	eqtrd 2173	1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))

Syntax hints:   → wi 4   ↔ wb 104   = wceq 1332  ifcif 3479

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 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122

This theorem depends on definitions:  df-bi 116  df-tru 1335  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-rab 2426  df-v 2691  df-un 3080  df-if 3480

This theorem is referenced by:  updjudhcoinlf  6973  updjudhcoinrg  6974  omp1eom  6988  xaddval  9658  iseqf1olemqval  10291  iseqf1olemqk  10298  seq3f1olemqsum  10304  exp3val  10326  cvgratz  11333  eucalgval2  11770  ennnfonelemg  11952  ennnfonelem1  11956  ressid2  12057  ressval2  12058