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Theorem coex 5308
Description: The composition of two sets is a set. (Contributed by NM, 15-Dec-2003.)
Hypotheses
Ref Expression
coex.1  |-  A  e. 
_V
coex.2  |-  B  e. 
_V
Assertion
Ref Expression
coex  |-  ( A  o.  B )  e. 
_V

Proof of Theorem coex
StepHypRef Expression
1 coex.1 . 2  |-  A  e. 
_V
2 coex.2 . 2  |-  B  e. 
_V
3 coexg 5307 . 2  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  ( A  o.  B
)  e.  _V )
41, 2, 3mp2an 426 1  |-  ( A  o.  B )  e. 
_V
Colors of variables: wff set class
Syntax hints:    e. wcel 2203   _Vcvv 2813    o. ccom 4753
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2815  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-br 4110  df-opab 4172  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760
This theorem is referenced by:  domtr  7025  cc3  7582  seqf1og  10883  hashfacen  11208  nninfct  12737  ctinfom  13179  qnnen  13182  enctlem  13183  cndsex  14701
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