Theorem tfrlem9 6428

Description: Lemma for transfinite recursion. Here we compute the value of recs (the union of all acceptable functions). (Contributed by NM, 17-Aug-1994.)

Hypothesis

Ref	Expression
tfrlem.1	|- A = { f | E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) }

Assertion

Ref	Expression
tfrlem9	|- ( B e. dom recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) )

Distinct variable groups:   x, f, y, B   f, F, x, y

Allowed substitution hints:   A( x, y, f)

Proof of Theorem tfrlem9

Dummy variable z is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eldm2g 4893	. . 3 |- ( B e. dom recs ( F ) -> ( B e. dom recs ( F ) <-> E. z <. B , z >. e. recs ( F ) ) )
2	1	ibi 176	. 2 |- ( B e. dom recs ( F ) -> E. z <. B , z >. e. recs ( F ) )
3		df-recs 6414	. . . . . 6 |- recs ( F ) = U. { f | E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) }
4	3	eleq2i 2274	. . . . 5 |- ( <. B , z >. e. recs ( F ) <-> <. B , z >. e. U. { f | E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) } )
5		eluniab 3876	. . . . 5 |- ( <. B , z >. e. U. { f | E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) } <-> E. f ( <. B , z >. e. f /\ E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) ) )
6	4, 5	bitri 184	. . . 4 |- ( <. B , z >. e. recs ( F ) <-> E. f ( <. B , z >. e. f /\ E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) ) )
7		fnop 5398	. . . . . . . . . . . . . 14 |- ( ( f Fn x /\ <. B , z >. e. f ) -> B e. x )
8		rspe 2557	. . . . . . . . . . . . . . . 16 |- ( ( x e. On /\ ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) ) -> E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) )
9		tfrlem.1	. . . . . . . . . . . . . . . . . 18 |- A = { f | E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) }
10	9	abeq2i 2318	. . . . . . . . . . . . . . . . 17 |- ( f e. A <-> E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) )
11		elssuni 3892	. . . . . . . . . . . . . . . . . 18 |- ( f e. A -> f C_ U. A )
12	9	recsfval 6424	. . . . . . . . . . . . . . . . . 18 |- recs ( F ) = U. A
13	11, 12	sseqtrrdi 3250	. . . . . . . . . . . . . . . . 17 |- ( f e. A -> f C_ recs ( F ) )
14	10, 13	sylbir 135	. . . . . . . . . . . . . . . 16 |- ( E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) -> f C_ recs ( F ) )
15	8, 14	syl 14	. . . . . . . . . . . . . . 15 |- ( ( x e. On /\ ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) ) -> f C_ recs ( F ) )
16		fveq2 5599	. . . . . . . . . . . . . . . . . . . 20 |- ( y = B -> ( f ` y ) = ( f ` B ) )
17		reseq2 4973	. . . . . . . . . . . . . . . . . . . . 21 |- ( y = B -> ( f |` y ) = ( f |` B ) )
18	17	fveq2d 5603	. . . . . . . . . . . . . . . . . . . 20 |- ( y = B -> ( F ` ( f |` y ) ) = ( F ` ( f |` B ) ) )
19	16, 18	eqeq12d 2222	. . . . . . . . . . . . . . . . . . 19 |- ( y = B -> ( ( f ` y ) = ( F ` ( f |` y ) ) <-> ( f ` B ) = ( F ` ( f |` B ) ) ) )
20	19	rspcv 2880	. . . . . . . . . . . . . . . . . 18 |- ( B e. x -> ( A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) -> ( f ` B ) = ( F ` ( f |` B ) ) ) )
21		fndm 5392	. . . . . . . . . . . . . . . . . . . . 21 |- ( f Fn x -> dom f = x )
22	21	eleq2d 2277	. . . . . . . . . . . . . . . . . . . 20 |- ( f Fn x -> ( B e. dom f <-> B e. x ) )
23	9	tfrlem7 6426	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 |- Fun recs ( F )
24		funssfv 5625	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 |- ( ( Fun recs ( F ) /\ f C_ recs ( F ) /\ B e. dom f ) -> (recs ( F ) ` B ) = ( f ` B ) )
25	23, 24	mp3an1 1337	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 |- ( ( f C_ recs ( F ) /\ B e. dom f ) -> (recs ( F ) ` B ) = ( f ` B ) )
26	25	adantrl 478	. . . . . . . . . . . . . . . . . . . . . . . . . 26 |- ( ( f C_ recs ( F ) /\ ( ( f Fn x /\ x e. On ) /\ B e. dom f ) ) -> (recs ( F ) ` B ) = ( f ` B ) )
27	21	eleq1d 2276	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 |- ( f Fn x -> ( dom f e. On <-> x e. On ) )
28		onelss 4452	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 |- ( dom f e. On -> ( B e. dom f -> B C_ dom f ) )
29	27, 28	biimtrrdi 164	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 |- ( f Fn x -> ( x e. On -> ( B e. dom f -> B C_ dom f ) ) )
30	29	imp31 256	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 |- ( ( ( f Fn x /\ x e. On ) /\ B e. dom f ) -> B C_ dom f )
31		fun2ssres 5333	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 |- ( ( Fun recs ( F ) /\ f C_ recs ( F ) /\ B C_ dom f ) -> (recs ( F ) |` B ) = ( f |` B ) )
32	31	fveq2d 5603	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 |- ( ( Fun recs ( F ) /\ f C_ recs ( F ) /\ B C_ dom f ) -> ( F ` (recs ( F ) |` B ) ) = ( F ` ( f |` B ) ) )
33	23, 32	mp3an1 1337	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 |- ( ( f C_ recs ( F ) /\ B C_ dom f ) -> ( F ` (recs ( F ) |` B ) ) = ( F ` ( f |` B ) ) )
34	30, 33	sylan2 286	. . . . . . . . . . . . . . . . . . . . . . . . . 26 |- ( ( f C_ recs ( F ) /\ ( ( f Fn x /\ x e. On ) /\ B e. dom f ) ) -> ( F ` (recs ( F ) |` B ) ) = ( F ` ( f |` B ) ) )
35	26, 34	eqeq12d 2222	. . . . . . . . . . . . . . . . . . . . . . . . 25 |- ( ( f C_ recs ( F ) /\ ( ( f Fn x /\ x e. On ) /\ B e. dom f ) ) -> ( (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) <-> ( f ` B ) = ( F ` ( f |` B ) ) ) )
36	35	exbiri 382	. . . . . . . . . . . . . . . . . . . . . . . 24 |- ( f C_ recs ( F ) -> ( ( ( f Fn x /\ x e. On ) /\ B e. dom f ) -> ( ( f ` B ) = ( F ` ( f |` B ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) )
37	36	com3l 81	. . . . . . . . . . . . . . . . . . . . . . 23 |- ( ( ( f Fn x /\ x e. On ) /\ B e. dom f ) -> ( ( f ` B ) = ( F ` ( f |` B ) ) -> ( f C_ recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) )
38	37	exp31 364	. . . . . . . . . . . . . . . . . . . . . 22 |- ( f Fn x -> ( x e. On -> ( B e. dom f -> ( ( f ` B ) = ( F ` ( f |` B ) ) -> ( f C_ recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) ) )
39	38	com34 83	. . . . . . . . . . . . . . . . . . . . 21 |- ( f Fn x -> ( x e. On -> ( ( f ` B ) = ( F ` ( f |` B ) ) -> ( B e. dom f -> ( f C_ recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) ) )
40	39	com24 87	. . . . . . . . . . . . . . . . . . . 20 |- ( f Fn x -> ( B e. dom f -> ( ( f ` B ) = ( F ` ( f |` B ) ) -> ( x e. On -> ( f C_ recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) ) )
41	22, 40	sylbird 170	. . . . . . . . . . . . . . . . . . 19 |- ( f Fn x -> ( B e. x -> ( ( f ` B ) = ( F ` ( f |` B ) ) -> ( x e. On -> ( f C_ recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) ) )
42	41	com3l 81	. . . . . . . . . . . . . . . . . 18 |- ( B e. x -> ( ( f ` B ) = ( F ` ( f |` B ) ) -> ( f Fn x -> ( x e. On -> ( f C_ recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) ) )
43	20, 42	syld 45	. . . . . . . . . . . . . . . . 17 |- ( B e. x -> ( A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) -> ( f Fn x -> ( x e. On -> ( f C_ recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) ) )
44	43	com24 87	. . . . . . . . . . . . . . . 16 |- ( B e. x -> ( x e. On -> ( f Fn x -> ( A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) -> ( f C_ recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) ) )
45	44	imp4d 352	. . . . . . . . . . . . . . 15 |- ( B e. x -> ( ( x e. On /\ ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) ) -> ( f C_ recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) )
46	15, 45	mpdi 43	. . . . . . . . . . . . . 14 |- ( B e. x -> ( ( x e. On /\ ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) )
47	7, 46	syl 14	. . . . . . . . . . . . 13 |- ( ( f Fn x /\ <. B , z >. e. f ) -> ( ( x e. On /\ ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) )
48	47	exp4d 369	. . . . . . . . . . . 12 |- ( ( f Fn x /\ <. B , z >. e. f ) -> ( x e. On -> ( f Fn x -> ( A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) )
49	48	ex 115	. . . . . . . . . . 11 |- ( f Fn x -> ( <. B , z >. e. f -> ( x e. On -> ( f Fn x -> ( A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) ) )
50	49	com4r 86	. . . . . . . . . 10 |- ( f Fn x -> ( f Fn x -> ( <. B , z >. e. f -> ( x e. On -> ( A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) ) )
51	50	pm2.43i 49	. . . . . . . . 9 |- ( f Fn x -> ( <. B , z >. e. f -> ( x e. On -> ( A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) )
52	51	com3l 81	. . . . . . . 8 |- ( <. B , z >. e. f -> ( x e. On -> ( f Fn x -> ( A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) ) )
53	52	imp4a 349	. . . . . . 7 |- ( <. B , z >. e. f -> ( x e. On -> ( ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) ) )
54	53	rexlimdv 2624	. . . . . 6 |- ( <. B , z >. e. f -> ( E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) ) )
55	54	imp 124	. . . . 5 |- ( ( <. B , z >. e. f /\ E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) )
56	55	exlimiv 1622	. . . 4 |- ( E. f ( <. B , z >. e. f /\ E. x e. On ( f Fn x /\ A. y e. x ( f ` y ) = ( F ` ( f |` y ) ) ) ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) )
57	6, 56	sylbi 121	. . 3 |- ( <. B , z >. e. recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) )
58	57	exlimiv 1622	. 2 |- ( E. z <. B , z >. e. recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) )
59	2, 58	syl 14	1 |- ( B e. dom recs ( F ) -> (recs ( F ) ` B ) = ( F ` (recs ( F ) |` B ) ) )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 981   = wceq 1373   E.wex 1516   e. wcel 2178   {cab 2193   A.wral 2486   E.wrex 2487   C_ wss 3174   <.cop 3646   U.cuni 3864   Oncon0 4428   dom cdm 4693   |` cres 4695   Fun wfun 5284   Fn wfn 5285   ` cfv 5290  recscrecs 6413

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-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-setind 4603

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-rab 2495  df-v 2778  df-sbc 3006  df-csb 3102  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-iun 3943  df-br 4060  df-opab 4122  df-mpt 4123  df-tr 4159  df-id 4358  df-iord 4431  df-on 4433  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-res 4705  df-iota 5251  df-fun 5292  df-fn 5293  df-fv 5298  df-recs 6414

This theorem is referenced by:  tfr2a  6430  tfrlemiubacc  6439  tfr1onlemubacc  6455  tfrcllemubacc  6468