Theorem ifbieq12d 3552

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 3547	. 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 3545	. 2 ⊢ (𝜑 → if(𝜒, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))
6	2, 5	eqtrd 2203	1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) = if(𝜒, 𝐶, 𝐷))

Syntax hints:   → wi 4   ↔ wb 104   = wceq 1348  ifcif 3526

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 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-rab 2457  df-v 2732  df-un 3125  df-if 3527

This theorem is referenced by:  updjudhcoinlf  7057  updjudhcoinrg  7058  omp1eom  7072  xaddval  9802  iseqf1olemqval  10443  iseqf1olemqk  10450  seq3f1olemqsum  10456  exp3val  10478  cvgratz  11495  eucalgval2  12007  ennnfonelemg  12358  ennnfonelem1  12362  ressid2  12477  ressval2  12478  lgsval  13699