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Theorem fovcl 5626
Description: Closure law for an operation. (Contributed by NM, 19-Apr-2007.)
Hypothesis
Ref Expression
fovcl.1  |-  F :
( R  X.  S
) --> C
Assertion
Ref Expression
fovcl  |-  ( ( A  e.  R  /\  B  e.  S )  ->  ( A F B )  e.  C )

Proof of Theorem fovcl
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fovcl.1 . . 3  |-  F :
( R  X.  S
) --> C
2 ffnov 5625 . . . 4  |-  ( F : ( R  X.  S ) --> C  <->  ( F  Fn  ( R  X.  S
)  /\  A. x  e.  R  A. y  e.  S  ( x F y )  e.  C ) )
32simprbi 269 . . 3  |-  ( F : ( R  X.  S ) --> C  ->  A. x  e.  R  A. y  e.  S  ( x F y )  e.  C )
41, 3ax-mp 7 . 2  |-  A. x  e.  R  A. y  e.  S  ( x F y )  e.  C
5 oveq1 5539 . . . 4  |-  ( x  =  A  ->  (
x F y )  =  ( A F y ) )
65eleq1d 2147 . . 3  |-  ( x  =  A  ->  (
( x F y )  e.  C  <->  ( A F y )  e.  C ) )
7 oveq2 5540 . . . 4  |-  ( y  =  B  ->  ( A F y )  =  ( A F B ) )
87eleq1d 2147 . . 3  |-  ( y  =  B  ->  (
( A F y )  e.  C  <->  ( A F B )  e.  C
) )
96, 8rspc2v 2713 . 2  |-  ( ( A  e.  R  /\  B  e.  S )  ->  ( A. x  e.  R  A. y  e.  S  ( x F y )  e.  C  ->  ( A F B )  e.  C ) )
104, 9mpi 15 1  |-  ( ( A  e.  R  /\  B  e.  S )  ->  ( A F B )  e.  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 102    = wceq 1284    e. wcel 1433   A.wral 2348    X. cxp 4361    Fn wfn 4917   -->wf 4918  (class class class)co 5532
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-14 1445  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896  ax-pow 3948  ax-pr 3964
This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-nf 1390  df-sb 1686  df-eu 1944  df-mo 1945  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353  df-rex 2354  df-v 2603  df-sbc 2816  df-csb 2909  df-un 2977  df-in 2979  df-ss 2986  df-pw 3384  df-sn 3404  df-pr 3405  df-op 3407  df-uni 3602  df-iun 3680  df-br 3786  df-opab 3840  df-mpt 3841  df-id 4048  df-xp 4369  df-rel 4370  df-cnv 4371  df-co 4372  df-dm 4373  df-rn 4374  df-iota 4887  df-fun 4924  df-fn 4925  df-f 4926  df-fv 4930  df-ov 5535
This theorem is referenced by:  ixxssxr  8923  fzof  9154  elfzoelz  9157  fzoval  9158
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