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Theorem ineq1d 3431
Description: Equality deduction for intersection of two classes. (Contributed by NM, 10-Apr-1994.)
Hypothesis
Ref Expression
ineq1d.1  |-  ( ph  ->  A  =  B )
Assertion
Ref Expression
ineq1d  |-  ( ph  ->  ( A  i^i  C
)  =  ( B  i^i  C ) )

Proof of Theorem ineq1d
StepHypRef Expression
1 ineq1d.1 . 2  |-  ( ph  ->  A  =  B )
2 ineq1 3425 . 2  |-  ( A  =  B  ->  ( A  i^i  C )  =  ( B  i^i  C
) )
31, 2syl 14 1  |-  ( ph  ->  ( A  i^i  C
)  =  ( B  i^i  C ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    = wceq 1402    i^i cin 3219
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-in 3226
This theorem is used by:  diftpsn3  3856  disji2  4122  ordpwsucexmid  4717  riinint  5043  fnresdisj  5493  fnimadisj  5504  ecinxp  6884  fiintim  7238  fival  7304  fzval2  10425  fvinim0ffz  10671  hashfibc  11299  fsum1p  12204  fprod1p  12385  ballotfilemfval  13281  ballotfilemfp1  13283  ballotfilemfc0  13284  ballotfilemfcc  13285  ballotfilemgval  13319  ballotfilemgun  13320  strressid  13478  restopnb  15373  metrest  15698  qtopbasss  15713  chtqcl  16205  chtqval  16206  ppiqval  16209  ppival2  16210  ppival2g  16211  chtqfl  16219  ppiprm  16220  chtprm  16222  chtnprm  16223  chtdif  16225  ppidif  16230  prmorcht  16243
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