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Theorem strndxid 12359
Description: The value of a structure component extractor is the value of the corresponding slot of the structure. (Contributed by AV, 13-Mar-2020.)
Hypotheses
Ref Expression
strndxid.s  |-  ( ph  ->  S  e.  V )
strndxid.e  |-  E  = Slot 
N
strndxid.n  |-  N  e.  NN
Assertion
Ref Expression
strndxid  |-  ( ph  ->  ( S `  ( E `  ndx ) )  =  ( E `  S ) )

Proof of Theorem strndxid
StepHypRef Expression
1 strndxid.e . . . 4  |-  E  = Slot 
N
2 strndxid.n . . . 4  |-  N  e.  NN
31, 2ndxid 12355 . . 3  |-  E  = Slot  ( E `  ndx )
4 strndxid.s . . 3  |-  ( ph  ->  S  e.  V )
51, 2ndxarg 12354 . . . . 5  |-  ( E `
 ndx )  =  N
65, 2eqeltri 2237 . . . 4  |-  ( E `
 ndx )  e.  NN
76a1i 9 . . 3  |-  ( ph  ->  ( E `  ndx )  e.  NN )
83, 4, 7strnfvnd 12351 . 2  |-  ( ph  ->  ( E `  S
)  =  ( S `
 ( E `  ndx ) ) )
98eqcomd 2170 1  |-  ( ph  ->  ( S `  ( E `  ndx ) )  =  ( E `  S ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1342    e. wcel 2135   ` cfv 5182   NNcn 8848   ndxcnx 12328  Slot cslot 12330
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1434  ax-7 1435  ax-gen 1436  ax-ie1 1480  ax-ie2 1481  ax-8 1491  ax-10 1492  ax-11 1493  ax-i12 1494  ax-bndl 1496  ax-4 1497  ax-17 1513  ax-i9 1517  ax-ial 1521  ax-i5r 1522  ax-13 2137  ax-14 2138  ax-ext 2146  ax-sep 4094  ax-pow 4147  ax-pr 4181  ax-un 4405  ax-cnex 7835  ax-resscn 7836  ax-1re 7838  ax-addrcl 7841
This theorem depends on definitions:  df-bi 116  df-3an 969  df-tru 1345  df-nf 1448  df-sb 1750  df-eu 2016  df-mo 2017  df-clab 2151  df-cleq 2157  df-clel 2160  df-nfc 2295  df-ral 2447  df-rex 2448  df-v 2723  df-sbc 2947  df-un 3115  df-in 3117  df-ss 3124  df-pw 3555  df-sn 3576  df-pr 3577  df-op 3579  df-uni 3784  df-int 3819  df-br 3977  df-opab 4038  df-mpt 4039  df-id 4265  df-xp 4604  df-rel 4605  df-cnv 4606  df-co 4607  df-dm 4608  df-rn 4609  df-res 4610  df-iota 5147  df-fun 5184  df-fv 5190  df-inn 8849  df-ndx 12334  df-slot 12335
This theorem is referenced by: (None)
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