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Theorem coexg 5312
Description: The composition of two sets is a set. (Contributed by NM, 19-Mar-1998.)
Assertion
Ref Expression
coexg  |-  ( ( A  e.  V  /\  B  e.  W )  ->  ( A  o.  B
)  e.  _V )

Proof of Theorem coexg
StepHypRef Expression
1 cossxp 5290 . 2  |-  ( A  o.  B )  C_  ( dom  B  X.  ran  A )
2 dmexg 5026 . . 3  |-  ( B  e.  W  ->  dom  B  e.  _V )
3 rnexg 5027 . . 3  |-  ( A  e.  V  ->  ran  A  e.  _V )
4 xpexg 4869 . . 3  |-  ( ( dom  B  e.  _V  /\ 
ran  A  e.  _V )  ->  ( dom  B  X.  ran  A )  e. 
_V )
52, 3, 4syl2anr 290 . 2  |-  ( ( A  e.  V  /\  B  e.  W )  ->  ( dom  B  X.  ran  A )  e.  _V )
6 ssexg 4254 . 2  |-  ( ( ( A  o.  B
)  C_  ( dom  B  X.  ran  A )  /\  ( dom  B  X.  ran  A )  e. 
_V )  ->  ( A  o.  B )  e.  _V )
71, 5, 6sylancr 414 1  |-  ( ( A  e.  V  /\  B  e.  W )  ->  ( A  o.  B
)  e.  _V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    e. wcel 2205   _Vcvv 2815    C_ wss 3214    X. cxp 4752   dom cdm 4754   ran crn 4755    o. ccom 4758
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 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765
This theorem is referenced by:  coex  5313  suppcofn  6479  seqf1oglem2  10906  seqf1og  10907  gsumwmhm  13753  gsumfzreidx  14090  gsumfzmhm  14096  gfsumval  14102  gsumshift  14105  znval  14910  znle  14911  znbaslemnn  14913  climcncf  15575
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