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Theorem strndxid 12493
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 12489 . . 3  |-  E  = Slot  ( E `  ndx )
4 strndxid.s . . 3  |-  ( ph  ->  S  e.  V )
51, 2ndxarg 12488 . . . . 5  |-  ( E `
 ndx )  =  N
65, 2eqeltri 2250 . . . 4  |-  ( E `
 ndx )  e.  NN
76a1i 9 . . 3  |-  ( ph  ->  ( E `  ndx )  e.  NN )
83, 4, 7strnfvnd 12485 . 2  |-  ( ph  ->  ( E `  S
)  =  ( S `
 ( E `  ndx ) ) )
98eqcomd 2183 1  |-  ( ph  ->  ( S `  ( E `  ndx ) )  =  ( E `  S ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1353    e. wcel 2148   ` cfv 5218   NNcn 8922   ndxcnx 12462  Slot cslot 12464
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-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4123  ax-pow 4176  ax-pr 4211  ax-un 4435  ax-cnex 7905  ax-resscn 7906  ax-1re 7908  ax-addrcl 7911
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2741  df-sbc 2965  df-un 3135  df-in 3137  df-ss 3144  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-int 3847  df-br 4006  df-opab 4067  df-mpt 4068  df-id 4295  df-xp 4634  df-rel 4635  df-cnv 4636  df-co 4637  df-dm 4638  df-rn 4639  df-res 4640  df-iota 5180  df-fun 5220  df-fv 5226  df-inn 8923  df-ndx 12468  df-slot 12469
This theorem is referenced by:  imasbas  12734  imasplusg  12735  imasmulr  12736
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