Theorem frecabex 6117

Description: The class abstraction from df-frec 6110 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 4381	. . . 4 |- om e. _V
2		simpr 108	. . . . . . 7 |- ( ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) -> x e. ( F ` ( S ` m ) ) )
3	2	abssi 3085	. . . . . 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 2618	. . . . . . . 8 |- m e. _V
6		fvexg 5287	. . . . . . . 8 |- ( ( S e. V /\ m e. _V ) -> ( S ` m ) e. _V )
7	4, 5, 6	sylancl 404	. . . . . . 7 |- ( ph -> ( S ` m ) e. _V )
8		frecabex.fvex	. . . . . . 7 |- ( ph -> A. y ( F ` y ) e. _V )
9		fveq2 5268	. . . . . . . . 9 |- ( y = ( S ` m ) -> ( F ` y ) = ( F ` ( S ` m ) ) )
10	9	eleq1d 2153	. . . . . . . 8 |- ( y = ( S ` m ) -> ( ( F ` y ) e. _V <-> ( F ` ( S ` m ) ) e. _V ) )
11	10	spcgv 2699	. . . . . . 7 |- ( ( S ` m ) e. _V -> ( A. y ( F ` y ) e. _V -> ( F ` ( S ` m ) ) e. _V ) )
12	7, 8, 11	sylc 61	. . . . . 6 |- ( ph -> ( F ` ( S ` m ) ) e. _V )
13		ssexg 3953	. . . . . 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 405	. . . . 5 |- ( ph -> { x | ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V )
15	14	ralrimivw 2443	. . . 4 |- ( ph -> A. m e. om { x | ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V )
16		abrexex2g 5848	. . . 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 405	. . 3 |- ( ph -> { x | E. m e. om ( dom S = suc m /\ x e. ( F ` ( S ` m ) ) ) } e. _V )
18		simpr 108	. . . . 5 |- ( ( dom S = (/) /\ x e. A ) -> x e. A )
19	18	abssi 3085	. . . 4 |- { x | ( dom S = (/) /\ x e. A ) } C_ A
20		frecabex.aex	. . . 4 |- ( ph -> A e. W )
21		ssexg 3953	. . . 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 405	. . 3 |- ( ph -> { x | ( dom S = (/) /\ x e. A ) } e. _V )
23	17, 22	jca 300	. 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 4241	. . 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 3255	. . . 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 2150	. . 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 182	. 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 120	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 102   \/ wo 662   A.wal 1285   = wceq 1287   e. wcel 1436   {cab 2071   A.wral 2355   E.wrex 2356   _Vcvv 2615   u. cun 2986   C_ wss 2988   (/)c0 3275   suc csuc 4166   omcom 4378   dom cdm 4411   ` cfv 4981

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1379  ax-7 1380  ax-gen 1381  ax-ie1 1425  ax-ie2 1426  ax-8 1438  ax-10 1439  ax-11 1440  ax-i12 1441  ax-bndl 1442  ax-4 1443  ax-13 1447  ax-14 1448  ax-17 1462  ax-i9 1466  ax-ial 1470  ax-i5r 1471  ax-ext 2067  ax-coll 3929  ax-sep 3932  ax-pow 3984  ax-pr 4010  ax-un 4234  ax-iinf 4376

This theorem depends on definitions:  df-bi 115  df-3an 924  df-tru 1290  df-nf 1393  df-sb 1690  df-eu 1948  df-mo 1949  df-clab 2072  df-cleq 2078  df-clel 2081  df-nfc 2214  df-ral 2360  df-rex 2361  df-reu 2362  df-rab 2364  df-v 2617  df-sbc 2830  df-csb 2923  df-un 2992  df-in 2994  df-ss 3001  df-pw 3417  df-sn 3437  df-pr 3438  df-op 3440  df-uni 3637  df-int 3672  df-iun 3715  df-br 3821  df-opab 3875  df-mpt 3876  df-id 4094  df-iom 4379  df-xp 4417  df-rel 4418  df-cnv 4419  df-co 4420  df-dm 4421  df-rn 4422  df-res 4423  df-ima 4424  df-iota 4946  df-fun 4983  df-fn 4984  df-f 4985  df-f1 4986  df-fo 4987  df-f1o 4988  df-fv 4989

This theorem is referenced by:  frectfr  6119