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Theorem elbasov 14766
Description: Utility theorem: reverse closure for any structure defined as a two-argument function. (Contributed by Mario Carneiro, 3-Oct-2015.)
Hypotheses
Ref Expression
elbasov.o  |-  Rel  dom  O
elbasov.s  |-  S  =  ( X O Y )
elbasov.b  |-  B  =  ( Base `  S
)
Assertion
Ref Expression
elbasov  |-  ( A  e.  B  ->  ( X  e.  _V  /\  Y  e.  _V ) )

Proof of Theorem elbasov
StepHypRef Expression
1 n0i 3788 . 2  |-  ( A  e.  B  ->  -.  B  =  (/) )
2 elbasov.s . . . . 5  |-  S  =  ( X O Y )
3 elbasov.o . . . . . 6  |-  Rel  dom  O
43ovprc 6300 . . . . 5  |-  ( -.  ( X  e.  _V  /\  Y  e.  _V )  ->  ( X O Y )  =  (/) )
52, 4syl5eq 2507 . . . 4  |-  ( -.  ( X  e.  _V  /\  Y  e.  _V )  ->  S  =  (/) )
65fveq2d 5852 . . 3  |-  ( -.  ( X  e.  _V  /\  Y  e.  _V )  ->  ( Base `  S
)  =  ( Base `  (/) ) )
7 elbasov.b . . 3  |-  B  =  ( Base `  S
)
8 base0 14757 . . 3  |-  (/)  =  (
Base `  (/) )
96, 7, 83eqtr4g 2520 . 2  |-  ( -.  ( X  e.  _V  /\  Y  e.  _V )  ->  B  =  (/) )
101, 9nsyl2 127 1  |-  ( A  e.  B  ->  ( X  e.  _V  /\  Y  e.  _V ) )
Colors of variables: wff setvar class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 367    = wceq 1398    e. wcel 1823   _Vcvv 3106   (/)c0 3783   dom cdm 4988   Rel wrel 4993   ` cfv 5570  (class class class)co 6270   Basecbs 14716
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1623  ax-4 1636  ax-5 1709  ax-6 1752  ax-7 1795  ax-8 1825  ax-9 1827  ax-10 1842  ax-11 1847  ax-12 1859  ax-13 2004  ax-ext 2432  ax-sep 4560  ax-nul 4568  ax-pow 4615  ax-pr 4676
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3an 973  df-tru 1401  df-ex 1618  df-nf 1622  df-sb 1745  df-eu 2288  df-mo 2289  df-clab 2440  df-cleq 2446  df-clel 2449  df-nfc 2604  df-ne 2651  df-ral 2809  df-rex 2810  df-rab 2813  df-v 3108  df-sbc 3325  df-dif 3464  df-un 3466  df-in 3468  df-ss 3475  df-nul 3784  df-if 3930  df-sn 4017  df-pr 4019  df-op 4023  df-uni 4236  df-br 4440  df-opab 4498  df-mpt 4499  df-id 4784  df-xp 4994  df-rel 4995  df-cnv 4996  df-co 4997  df-dm 4998  df-iota 5534  df-fun 5572  df-fv 5578  df-ov 6273  df-slot 14720  df-base 14721
This theorem is referenced by:  strov2rcl  14767  psrelbas  18227  psraddcl  18231  psrmulcllem  18235  psrvscafval  18238  psrvscacl  18241  resspsradd  18266  resspsrmul  18267  cphsubrglem  21790  mdegcl  22635
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