Theorem ndxslid 13435

Description: A structure component extractor is defined by its own index. That the index is a natural number will also be needed in quite a few contexts so it is included in the conclusion of this theorem which can be used as a hypothesis of theorems like strslfv 13455. (Contributed by Jim Kingdon, 29-Jan-2023.)

Hypotheses

Ref	Expression
ndxarg.1	|- E = Slot N
ndxarg.2	|- N e. NN

Assertion

Ref	Expression
ndxslid	|- ( E = Slot ( E ` ndx ) /\ ( E ` ndx ) e. NN )

Proof of Theorem ndxslid

Step	Hyp	Ref	Expression
1		ndxarg.1	. . 3 |- E = Slot N
2		ndxarg.2	. . 3 |- N e. NN
3	1, 2	ndxid 13434	. 2 |- E = Slot ( E ` ndx )
4	1, 2	ndxarg 13433	. . 3 |- ( E ` ndx ) = N
5	4, 2	eqeltri 2311	. 2 |- ( E ` ndx ) e. NN
6	3, 5	pm3.2i 272	1 |- ( E = Slot ( E ` ndx ) /\ ( E ` ndx ) e. NN )

This proof depends on syntax axioms:   /\ wa 104   = 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:  base0  13460  baseslid  13468  plusgslid  13525  2stropg  13534  2strop1g  13537  mulrslid  13545  starvslid  13554  scaslid  13566  vscaslid  13576  ipslid  13584  tsetslid  13601  pleslid  13615  dsslid  13630  homslid  13648  ccoslid  13651  prdsbaslemss  14281  zlmlemg  15072  znbaslemnn  15083  iedgvalg  16463  iedgex  16465  edgfiedgval2dom  16481  setsiedg  16498  iedgval0  16500  edgvalg  16505  edgstruct  16510