Theorem strndxid 12975

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

Step	Hyp	Ref	Expression
1		strndxid.e	. . . 4 |- E = Slot N
2		strndxid.n	. . . 4 |- N e. NN
3	1, 2	ndxid 12971	. . 3 |- E = Slot ( E ` ndx )
4		strndxid.s	. . 3 |- ( ph -> S e. V )
5	1, 2	ndxarg 12970	. . . . 5 |- ( E ` ndx ) = N
6	5, 2	eqeltri 2280	. . . 4 |- ( E ` ndx ) e. NN
7	6	a1i 9	. . 3 |- ( ph -> ( E ` ndx ) e. NN )
8	3, 4, 7	strnfvnd 12967	. 2 |- ( ph -> ( E ` S ) = ( S ` ( E ` ndx ) ) )
9	8	eqcomd 2213	1 |- ( ph -> ( S ` ( E ` ndx ) ) = ( E ` S ) )

Syntax hints:   -> wi 4   = wceq 1373   e. wcel 2178   ` cfv 5290   NNcn 9071   ndxcnx 12944  Slot cslot 12946

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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-un 4498  ax-cnex 8051  ax-resscn 8052  ax-1re 8054  ax-addrcl 8057

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-v 2778  df-sbc 3006  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-int 3900  df-br 4060  df-opab 4122  df-mpt 4123  df-id 4358  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-res 4705  df-iota 5251  df-fun 5292  df-fv 5298  df-inn 9072  df-ndx 12950  df-slot 12951

This theorem is referenced by:  imasbas  13254  imasplusg  13255  imasmulr  13256