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Theorem elind 3414
Description: Deduce membership in an intersection of two classes. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.)
Hypotheses
Ref Expression
elind.1  |-  ( ph  ->  X  e.  A )
elind.2  |-  ( ph  ->  X  e.  B )
Assertion
Ref Expression
elind  |-  ( ph  ->  X  e.  ( A  i^i  B ) )

Proof of Theorem elind
StepHypRef Expression
1 elind.1 . 2  |-  ( ph  ->  X  e.  A )
2 elind.2 . 2  |-  ( ph  ->  X  e.  B )
3 elin 3412 . 2  |-  ( X  e.  ( A  i^i  B )  <->  ( X  e.  A  /\  X  e.  B ) )
41, 2, 3sylanbrc 421 1  |-  ( ph  ->  X  e.  ( A  i^i  B ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    e. wcel 2209    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:  fnfvimad  5954  elfir  7307  infpwfidom  7550  hashfibclem  11296  ballotfilem2  13277  nninfdclemcl  13388  nninfdclemp1  13390  strslfv2d  13444  bassetsnn  13458  insubm  13841  2idl0  14898  2idl1  14899  aspval  15064  asplss  15065  aspsubrg  15067  baspartn  15200  bastg  15211  isopn3  15275  restbasg  15318  lmss  15396  metrest  15656  tgioo  15704  dvmulxxbr  15852  elply2  15885  pilem3  15934  ppiqsval  16156  ppiqsval2  16157  ppinprm  16171  2sqlem7  16338
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