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Theorem strndxid 13438
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 13434 . . 3  |-  E  = Slot  ( E `  ndx )
4 strndxid.s . . 3  |-  ( ph  ->  S  e.  V )
51, 2ndxarg 13433 . . . . 5  |-  ( E `
 ndx )  =  N
65, 2eqeltri 2311 . . . 4  |-  ( E `
 ndx )  e.  NN
76a1i 9 . . 3  |-  ( ph  ->  ( E `  ndx )  e.  NN )
83, 4, 7strnfvnd 13430 . 2  |-  ( ph  ->  ( E `  S
)  =  ( S `
 ( E `  ndx ) ) )
98eqcomd 2244 1  |-  ( ph  ->  ( S `  ( E `  ndx ) )  =  ( E `  S ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    = wceq 1402    e. wcel 2209   ` cfv 5380   NNcn 9313   ndxcnx 13407  Slot cslot 13409
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4251  ax-pow 4313  ax-pr 4348  ax-un 4580  ax-cnex 8276  ax-resscn 8277  ax-1re 8279  ax-addrcl 8282
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-br 4132  df-opab 4194  df-mpt 4195  df-id 4440  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-iota 5340  df-fun 5382  df-fv 5388  df-inn 9314  df-ndx 13413  df-slot 13414
This theorem is used by:  imasbas  13687  imasplusg  13688  imasmulr  13689
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