ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  ifbieq12d Unicode version

Theorem ifbieq12d 3468
Description: Equivalence deduction for conditional operators. (Contributed by Jeff Madsen, 2-Sep-2009.)
Hypotheses
Ref Expression
ifbieq12d.1  |-  ( ph  ->  ( ps  <->  ch )
)
ifbieq12d.2  |-  ( ph  ->  A  =  C )
ifbieq12d.3  |-  ( ph  ->  B  =  D )
Assertion
Ref Expression
ifbieq12d  |-  ( ph  ->  if ( ps ,  A ,  B )  =  if ( ch ,  C ,  D )
)

Proof of Theorem ifbieq12d
StepHypRef Expression
1 ifbieq12d.1 . . 3  |-  ( ph  ->  ( ps  <->  ch )
)
21ifbid 3463 . 2  |-  ( ph  ->  if ( ps ,  A ,  B )  =  if ( ch ,  A ,  B )
)
3 ifbieq12d.2 . . 3  |-  ( ph  ->  A  =  C )
4 ifbieq12d.3 . . 3  |-  ( ph  ->  B  =  D )
53, 4ifeq12d 3461 . 2  |-  ( ph  ->  if ( ch ,  A ,  B )  =  if ( ch ,  C ,  D )
)
62, 5eqtrd 2150 1  |-  ( ph  ->  if ( ps ,  A ,  B )  =  if ( ch ,  C ,  D )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 104    = wceq 1316   ifcif 3444
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 588  ax-in2 589  ax-io 683  ax-5 1408  ax-7 1409  ax-gen 1410  ax-ie1 1454  ax-ie2 1455  ax-8 1467  ax-10 1468  ax-11 1469  ax-i12 1470  ax-bndl 1471  ax-4 1472  ax-17 1491  ax-i9 1495  ax-ial 1499  ax-i5r 1500  ax-ext 2099
This theorem depends on definitions:  df-bi 116  df-tru 1319  df-nf 1422  df-sb 1721  df-clab 2104  df-cleq 2110  df-clel 2113  df-nfc 2247  df-rab 2402  df-v 2662  df-un 3045  df-if 3445
This theorem is referenced by:  updjudhcoinlf  6933  updjudhcoinrg  6934  omp1eom  6948  xaddval  9596  iseqf1olemqval  10228  iseqf1olemqk  10235  seq3f1olemqsum  10241  exp3val  10263  cvgratz  11269  eucalgval2  11661  ennnfonelemg  11843  ennnfonelem1  11847  ressid2  11945  ressval2  11946
  Copyright terms: Public domain W3C validator