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Theorem iftruei 3485
Description: Inference associated with iftrue 3484. (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
StepHypRef Expression
1 iftruei.1 . 2 𝜑
2 iftrue 3484 . 2 (𝜑 → if(𝜑, 𝐴, 𝐵) = 𝐴)
31, 2ax-mp 5 1 if(𝜑, 𝐴, 𝐵) = 𝐴
Colors of variables: wff set class
Syntax hints:   = 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-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-11 1485  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-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-if 3480
This theorem is referenced by:  ctmlemr  7001  xnegpnf  9641  xnegmnf  9642  xaddpnf1  9659  xaddpnf2  9660  xaddmnf1  9661  xaddmnf2  9662  pnfaddmnf  9663  mnfaddpnf  9664  iseqf1olemqk  10298  exp0  10328  sumsnf  11210  lcm0val  11782  ennnfonelemj0  11950  ennnfonelem0  11954  peano3nninf  13376  dceqnconst  13423
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