Theorem tfrcllemsucfn 6497

Description: We can extend an acceptable function by one element to produce a function. Lemma for tfrcl 6508. (Contributed by Jim Kingdon, 24-Mar-2022.)

Hypotheses

Ref	Expression
tfrcl.f	|- F = recs ( G )
tfrcl.g	|- ( ph -> Fun G )
tfrcl.x	|- ( ph -> Ord X )
tfrcl.ex	|- ( ( ph /\ x e. X /\ f : x --> S ) -> ( G ` f ) e. S )
tfrcllemsucfn.1	|- A = { f | E. x e. X ( f : x --> S /\ A. y e. x ( f ` y ) = ( G ` ( f |` y ) ) ) }
tfrcllemsucfn.3	|- ( ph -> z e. X )
tfrcllemsucfn.4	|- ( ph -> g : z --> S )
tfrcllemsucfn.5	|- ( ph -> g e. A )

Assertion

Ref	Expression
tfrcllemsucfn	|- ( ph -> ( g u. { <. z , ( G ` g ) >. } ) : suc z --> S )

Distinct variable groups:   f, G, x   S, f, x   f, X, x   f, g   ph, f, x   z, f, x

Allowed substitution hints:   ph( y, z, g)   A( x, y, z, f, g)   S( y, z, g)   F( x, y, z, f, g)   G( y, z, g)   X( y, z, g)

Proof of Theorem tfrcllemsucfn

Step	Hyp	Ref	Expression
1		tfrcllemsucfn.4	. . 3 |- ( ph -> g : z --> S )
2		tfrcllemsucfn.3	. . . 4 |- ( ph -> z e. X )
3	2	elexd 2813	. . 3 |- ( ph -> z e. _V )
4		tfrcl.x	. . . . 5 |- ( ph -> Ord X )
5		ordelon 4473	. . . . 5 |- ( ( Ord X /\ z e. X ) -> z e. On )
6	4, 2, 5	syl2anc 411	. . . 4 |- ( ph -> z e. On )
7		eloni 4465	. . . 4 |- ( z e. On -> Ord z )
8		ordirr 4633	. . . 4 |- ( Ord z -> -. z e. z )
9	6, 7, 8	3syl 17	. . 3 |- ( ph -> -. z e. z )
10		feq2 5456	. . . . . . 7 |- ( x = z -> ( f : x --> S <-> f : z --> S ) )
11	10	imbi1d 231	. . . . . 6 |- ( x = z -> ( ( f : x --> S -> ( G ` f ) e. S ) <-> ( f : z --> S -> ( G ` f ) e. S ) ) )
12	11	albidv 1870	. . . . 5 |- ( x = z -> ( A. f ( f : x --> S -> ( G ` f ) e. S ) <-> A. f ( f : z --> S -> ( G ` f ) e. S ) ) )
13		tfrcl.ex	. . . . . . . 8 |- ( ( ph /\ x e. X /\ f : x --> S ) -> ( G ` f ) e. S )
14	13	3expia 1229	. . . . . . 7 |- ( ( ph /\ x e. X ) -> ( f : x --> S -> ( G ` f ) e. S ) )
15	14	alrimiv 1920	. . . . . 6 |- ( ( ph /\ x e. X ) -> A. f ( f : x --> S -> ( G ` f ) e. S ) )
16	15	ralrimiva 2603	. . . . 5 |- ( ph -> A. x e. X A. f ( f : x --> S -> ( G ` f ) e. S ) )
17	12, 16, 2	rspcdva 2912	. . . 4 |- ( ph -> A. f ( f : z --> S -> ( G ` f ) e. S ) )
18		feq1 5455	. . . . . 6 |- ( f = g -> ( f : z --> S <-> g : z --> S ) )
19		fveq2 5626	. . . . . . 7 |- ( f = g -> ( G ` f ) = ( G ` g ) )
20	19	eleq1d 2298	. . . . . 6 |- ( f = g -> ( ( G ` f ) e. S <-> ( G ` g ) e. S ) )
21	18, 20	imbi12d 234	. . . . 5 |- ( f = g -> ( ( f : z --> S -> ( G ` f ) e. S ) <-> ( g : z --> S -> ( G ` g ) e. S ) ) )
22	21	spv 1906	. . . 4 |- ( A. f ( f : z --> S -> ( G ` f ) e. S ) -> ( g : z --> S -> ( G ` g ) e. S ) )
23	17, 1, 22	sylc 62	. . 3 |- ( ph -> ( G ` g ) e. S )
24		fsnunf 5838	. . 3 |- ( ( g : z --> S /\ ( z e. _V /\ -. z e. z ) /\ ( G ` g ) e. S ) -> ( g u. { <. z , ( G ` g ) >. } ) : ( z u. { z } ) --> S )
25	1, 3, 9, 23, 24	syl121anc 1276	. 2 |- ( ph -> ( g u. { <. z , ( G ` g ) >. } ) : ( z u. { z } ) --> S )
26		df-suc 4461	. . 3 |- suc z = ( z u. { z } )
27	26	feq2i 5466	. 2 |- ( ( g u. { <. z , ( G ` g ) >. } ) : suc z --> S <-> ( g u. { <. z , ( G ` g ) >. } ) : ( z u. { z } ) --> S )
28	25, 27	sylibr 134	1 |- ( ph -> ( g u. { <. z , ( G ` g ) >. } ) : suc z --> S )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   /\ w3a 1002   A.wal 1393   = wceq 1395   e. wcel 2200   {cab 2215   A.wral 2508   E.wrex 2509   _Vcvv 2799   u. cun 3195   {csn 3666   <.cop 3669   Ord word 4452   Oncon0 4453   suc csuc 4455   |` cres 4720   Fun wfun 5311   -->wf 5313   ` cfv 5317  recscrecs 6448

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-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4201  ax-pow 4257  ax-pr 4292  ax-setind 4628

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-v 2801  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-br 4083  df-opab 4145  df-tr 4182  df-id 4383  df-iord 4456  df-on 4458  df-suc 4461  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-rn 4729  df-iota 5277  df-fun 5319  df-fn 5320  df-f 5321  df-f1 5322  df-fo 5323  df-f1o 5324  df-fv 5325

This theorem is referenced by:  tfrcllemsucaccv  6498  tfrcllembfn  6501