Theorem frecabex 6484

Description: The class abstraction from df-frec 6477 exists. This is a lemma for other finite recursion proofs. (Contributed by Jim Kingdon, 13-May-2020.)

Hypotheses

Ref	Expression
frecabex.sex	|- ( ph -> S e. V )
frecabex.fvex	|- ( ph -> A. y ( F ` y ) e. _V )
frecabex.aex	|- ( ph -> A e. W )

Assertion

Ref	Expression
frecabex	|- ( ph -> { x | ( E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) \/ ( dom S = (/) /\ x e. A ) ) } e. _V )

Distinct variable groups:   x, A   x, F   x, S, y   ph, m   x, m, y   y, F

Allowed substitution hints:   ph( x, y)   A( y, m)   S( m)   F( m)   V( x, y, m)   W( x, y, m)

Proof of Theorem frecabex

Step	Hyp	Ref	Expression
1		omex 4641	. . . 4 |- om e. _V
2		simpr 110	. . . . . . 7 |- ( ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) -> x e. ( F ` ( S ` m ) ) )
3	2	abssi 3268	. . . . . 6 |- { x | ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } C_ ( F ` ( S ` m ) )
4		frecabex.sex	. . . . . . . 8 |- ( ph -> S e. V )
5		vex 2775	. . . . . . . 8 |- m e. _V
6		fvexg 5595	. . . . . . . 8 |- ( ( S e. V /\ m e. _V ) -> ( S ` m ) e. _V )
7	4, 5, 6	sylancl 413	. . . . . . 7 |- ( ph -> ( S ` m ) e. _V )
8		frecabex.fvex	. . . . . . 7 |- ( ph -> A. y ( F ` y ) e. _V )
9		fveq2 5576	. . . . . . . . 9 |- ( y = ( S ` m ) -> ( F ` y ) = ( F ` ( S ` m ) ) )
10	9	eleq1d 2274	. . . . . . . 8 |- ( y = ( S ` m ) -> ( ( F ` y ) e. _V <-> ( F ` ( S ` m ) ) e. _V ) )
11	10	spcgv 2860	. . . . . . 7 |- ( ( S ` m ) e. _V -> ( A. y ( F ` y ) e. _V -> ( F ` ( S ` m ) ) e. _V ) )
12	7, 8, 11	sylc 62	. . . . . 6 |- ( ph -> ( F ` ( S ` m ) ) e. _V )
13		ssexg 4183	. . . . . 6 |- ( ( { x | ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } C_ ( F ` ( S ` m ) ) /\ ( F ` ( S ` m ) ) e. _V ) -> { x | ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V )
14	3, 12, 13	sylancr 414	. . . . 5 |- ( ph -> { x | ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V )
15	14	ralrimivw 2580	. . . 4 |- ( ph -> A. m e. om { x | ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V )
16		abrexex2g 6205	. . . 4 |- ( ( om e. _V /\ A. m e. om { x | ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V ) -> { x | E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V )
17	1, 15, 16	sylancr 414	. . 3 |- ( ph -> { x | E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V )
18		simpr 110	. . . . 5 |- ( ( dom S = (/) /\ x e. A ) -> x e. A )
19	18	abssi 3268	. . . 4 |- { x | ( dom S = (/) /\ x e. A ) } C_ A
20		frecabex.aex	. . . 4 |- ( ph -> A e. W )
21		ssexg 4183	. . . 4 |- ( ( { x | ( dom S = (/) /\ x e. A ) } C_ A /\ A e. W ) -> { x | ( dom S = (/) /\ x e. A ) } e. _V )
22	19, 20, 21	sylancr 414	. . 3 |- ( ph -> { x | ( dom S = (/) /\ x e. A ) } e. _V )
23	17, 22	jca 306	. 2 |- ( ph -> ( { x | E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V /\ { x | ( dom S = (/) /\ x e. A ) } e. _V ) )
24		unexb 4489	. . 3 |- ( ( { x | E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V /\ { x | ( dom S = (/) /\ x e. A ) } e. _V ) <-> ( { x | E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } u. { x | ( dom S = (/) /\ x e. A ) } ) e. _V )
25		unab 3440	. . . 4 |- ( { x | E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } u. { x | ( dom S = (/) /\ x e. A ) } ) = { x | ( E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) \/ ( dom S = (/) /\ x e. A ) ) }
26	25	eleq1i 2271	. . 3 |- ( ( { x | E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } u. { x | ( dom S = (/) /\ x e. A ) } ) e. _V <-> { x | ( E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) \/ ( dom S = (/) /\ x e. A ) ) } e. _V )
27	24, 26	bitri 184	. 2 |- ( ( { x | E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V /\ { x | ( dom S = (/) /\ x e. A ) } e. _V ) <-> { x | ( E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) \/ ( dom S = (/) /\ x e. A ) ) } e. _V )
28	23, 27	sylib 122	1 |- ( ph -> { x | ( E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) \/ ( dom S = (/) /\ x e. A ) ) } e. _V )

Syntax hints:   -> wi 4   /\ wa 104   \/ wo 710   A.wal 1371   = wceq 1373   e. wcel 2176   {cab 2191   A.wral 2484   E.wrex 2485   _Vcvv 2772   u. cun 3164   C_ wss 3166   (/)c0 3460   suc csuc 4412   omcom 4638   dom cdm 4675   ` cfv 5271

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 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-13 2178  ax-14 2179  ax-ext 2187  ax-coll 4159  ax-sep 4162  ax-pow 4218  ax-pr 4253  ax-un 4480  ax-iinf 4636

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1484  df-sb 1786  df-eu 2057  df-mo 2058  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ral 2489  df-rex 2490  df-reu 2491  df-rab 2493  df-v 2774  df-sbc 2999  df-csb 3094  df-un 3170  df-in 3172  df-ss 3179  df-pw 3618  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-int 3886  df-iun 3929  df-br 4045  df-opab 4106  df-mpt 4107  df-id 4340  df-iom 4639  df-xp 4681  df-rel 4682  df-cnv 4683  df-co 4684  df-dm 4685  df-rn 4686  df-res 4687  df-ima 4688  df-iota 5232  df-fun 5273  df-fn 5274  df-f 5275  df-f1 5276  df-fo 5277  df-f1o 5278  df-fv 5279

This theorem is referenced by:  frectfr  6486