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Theorem funvtxdm2domval 15870
Description: The set of vertices of an extensible structure with (at least) two slots. (Contributed by AV, 12-Oct-2020.) (Revised by Jim Kingdon, 11-Dec-2025.)
Assertion
Ref Expression
funvtxdm2domval  |-  ( ( G  e.  V  /\  Fun  ( G  \  { (/)
} )  /\  2o  ~<_  dom  G )  ->  (Vtx `  G )  =  (
Base `  G )
)

Proof of Theorem funvtxdm2domval
StepHypRef Expression
1 vtxvalg 15857 . . 3  |-  ( G  e.  V  ->  (Vtx `  G )  =  if ( G  e.  ( _V  X.  _V ) ,  ( 1st `  G
) ,  ( Base `  G ) ) )
213ad2ant1 1042 . 2  |-  ( ( G  e.  V  /\  Fun  ( G  \  { (/)
} )  /\  2o  ~<_  dom  G )  ->  (Vtx `  G )  =  if ( G  e.  ( _V  X.  _V ) ,  ( 1st `  G
) ,  ( Base `  G ) ) )
3 fundm2domnop0 11099 . . . 4  |-  ( ( Fun  ( G  \  { (/) } )  /\  2o 
~<_  dom  G )  ->  -.  G  e.  ( _V  X.  _V ) )
43iffalsed 3613 . . 3  |-  ( ( Fun  ( G  \  { (/) } )  /\  2o 
~<_  dom  G )  ->  if ( G  e.  ( _V  X.  _V ) ,  ( 1st `  G
) ,  ( Base `  G ) )  =  ( Base `  G
) )
543adant1 1039 . 2  |-  ( ( G  e.  V  /\  Fun  ( G  \  { (/)
} )  /\  2o  ~<_  dom  G )  ->  if ( G  e.  ( _V  X.  _V ) ,  ( 1st `  G
) ,  ( Base `  G ) )  =  ( Base `  G
) )
62, 5eqtrd 2262 1  |-  ( ( G  e.  V  /\  Fun  ( G  \  { (/)
} )  /\  2o  ~<_  dom  G )  ->  (Vtx `  G )  =  (
Base `  G )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    /\ w3a 1002    = wceq 1395    e. wcel 2200   _Vcvv 2800    \ cdif 3195   (/)c0 3492   ifcif 3603   {csn 3667   class class class wbr 4086    X. cxp 4721   dom cdm 4723   Fun wfun 5318   ` cfv 5324   1stc1st 6296   2oc2o 6571    ~<_ cdom 6903   Basecbs 13072  Vtxcvtx 15853
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-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-nul 4213  ax-pow 4262  ax-pr 4297  ax-un 4528  ax-cnex 8113  ax-resscn 8114  ax-1re 8116  ax-addrcl 8119
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-rab 2517  df-v 2802  df-sbc 3030  df-csb 3126  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-nul 3493  df-if 3604  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-int 3927  df-br 4087  df-opab 4149  df-mpt 4150  df-id 4388  df-suc 4466  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-rn 4734  df-res 4735  df-iota 5284  df-fun 5326  df-fn 5327  df-f 5328  df-f1 5329  df-fo 5330  df-fv 5332  df-1st 6298  df-1o 6577  df-2o 6578  df-dom 6906  df-inn 9134  df-ndx 13075  df-slot 13076  df-base 13078  df-vtx 15855
This theorem is referenced by:  basvtxval2dom  15875  grstructd2dom  15889
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