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Theorem funvtxdm2domval 15953
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 15940 . . 3  |-  ( G  e.  V  ->  (Vtx `  G )  =  if ( G  e.  ( _V  X.  _V ) ,  ( 1st `  G
) ,  ( Base `  G ) ) )
213ad2ant1 1045 . 2  |-  ( ( G  e.  V  /\  Fun  ( G  \  { (/)
} )  /\  2o  ~<_  dom  G )  ->  (Vtx `  G )  =  if ( G  e.  ( _V  X.  _V ) ,  ( 1st `  G
) ,  ( Base `  G ) ) )
3 fundm2domnop0 11158 . . . 4  |-  ( ( Fun  ( G  \  { (/) } )  /\  2o 
~<_  dom  G )  ->  -.  G  e.  ( _V  X.  _V ) )
43iffalsed 3619 . . 3  |-  ( ( Fun  ( G  \  { (/) } )  /\  2o 
~<_  dom  G )  ->  if ( G  e.  ( _V  X.  _V ) ,  ( 1st `  G
) ,  ( Base `  G ) )  =  ( Base `  G
) )
543adant1 1042 . 2  |-  ( ( G  e.  V  /\  Fun  ( G  \  { (/)
} )  /\  2o  ~<_  dom  G )  ->  if ( G  e.  ( _V  X.  _V ) ,  ( 1st `  G
) ,  ( Base `  G ) )  =  ( Base `  G
) )
62, 5eqtrd 2264 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 1005    = wceq 1398    e. wcel 2202   _Vcvv 2803    \ cdif 3198   (/)c0 3496   ifcif 3607   {csn 3673   class class class wbr 4093    X. cxp 4729   dom cdm 4731   Fun wfun 5327   ` cfv 5333   1stc1st 6310   2oc2o 6619    ~<_ cdom 6951   Basecbs 13145  Vtxcvtx 15936
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 619  ax-in2 620  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 2204  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-nul 4220  ax-pow 4270  ax-pr 4305  ax-un 4536  ax-cnex 8166  ax-resscn 8167  ax-1re 8169  ax-addrcl 8172
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404  df-ral 2516  df-rex 2517  df-rab 2520  df-v 2805  df-sbc 3033  df-csb 3129  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-nul 3497  df-if 3608  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-int 3934  df-br 4094  df-opab 4156  df-mpt 4157  df-id 4396  df-suc 4474  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-res 4743  df-iota 5293  df-fun 5335  df-fn 5336  df-f 5337  df-f1 5338  df-fo 5339  df-fv 5341  df-1st 6312  df-1o 6625  df-2o 6626  df-dom 6954  df-inn 9186  df-ndx 13148  df-slot 13149  df-base 13151  df-vtx 15938
This theorem is referenced by:  basvtxval2dom  15958  grstructd2dom  15972
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