Theorem iftruei 3374

Description: Inference associated with iftrue 3373. (Contributed by BJ, 7-Oct-2018.)

Hypothesis

Ref	Expression
iftruei.1	⊢ 𝜑

Assertion

Ref	Expression
iftruei	⊢ if(𝜑, 𝐴, 𝐵) = 𝐴

Proof of Theorem iftruei

Step	Hyp	Ref	Expression
1		iftruei.1	. 2 ⊢ 𝜑
2		iftrue 3373	. 2 ⊢ (𝜑 → if(𝜑, 𝐴, 𝐵) = 𝐴)
3	1, 2	ax-mp 7	1 ⊢ if(𝜑, 𝐴, 𝐵) = 𝐴

Syntax hints:   = wceq 1285  ifcif 3368

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-in2 578  ax-io 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-11 1438  ax-4 1441  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2065

This theorem depends on definitions:  df-bi 115  df-nf 1391  df-sb 1688  df-clab 2070  df-cleq 2076  df-clel 2079  df-if 3369

This theorem is referenced by:  xnegpnf  9041  xnegmnf  9042  exp0  9647  lcm0val  10672