Theorem ifbieq1d 3371

Description: Equivalence/equality deduction for conditional operators. (Contributed by JJ, 25-Sep-2018.)

Hypotheses

Ref	Expression
ifbieq1d.1	⊢ (𝜑 → (𝜓 ↔ 𝜒))
ifbieq1d.2	⊢ (𝜑 → 𝐴 = 𝐵)

Assertion

Ref	Expression
ifbieq1d	⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶))

Proof of Theorem ifbieq1d

Step	Hyp	Ref	Expression
1		ifbieq1d.1	. . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒))
2	1	ifbid 3370	. 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐴, 𝐶))
3		ifbieq1d.2	. . 3 ⊢ (𝜑 → 𝐴 = 𝐵)
4	3	ifeq1d 3366	. 2 ⊢ (𝜑 → if(𝜒, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶))
5	2, 4	eqtrd 2113	1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐶) = if(𝜒, 𝐵, 𝐶))

Syntax hints:   → wi 4   ↔ wb 103   = wceq 1284  ifcif 3351

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 576  ax-in2 577  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063

This theorem depends on definitions:  df-bi 115  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-rab 2357  df-v 2603  df-un 2977  df-if 3352

This theorem is referenced by:  bcval  9676