Theorem frecsuc 6678

Description: The successor value resulting from finite recursive definition generation. (Contributed by Jim Kingdon, 31-Mar-2022.)

Assertion

Ref	Expression
frecsuc	|- ( ( A. z e. S ( F ` z ) e. S /\ A e. S /\ B e. om ) -> (frec ( F , A ) ` suc B ) = ( F ` (frec ( F , A ) ` B ) ) )

Distinct variable groups:   z, F   z, S

Allowed substitution hints:   A( z)   B( z)

Proof of Theorem frecsuc

Dummy variables f g m x y n are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		dmeq 4981	. . . . . . . . 9 |- ( f = g -> dom f = dom g )
2	1	eqeq1d 2247	. . . . . . . 8 |- ( f = g -> ( dom f = suc n <-> dom g = suc n ) )
3		fveq1 5694	. . . . . . . . . 10 |- ( f = g -> ( f ` n ) = ( g ` n ) )
4	3	fveq2d 5699	. . . . . . . . 9 |- ( f = g -> ( F ` ( f ` n ) ) = ( F ` ( g ` n ) ) )
5	4	eleq2d 2308	. . . . . . . 8 |- ( f = g -> ( y e. ( F ` ( f ` n ) ) <-> y e. ( F ` ( g ` n ) ) ) )
6	2, 5	anbi12d 477	. . . . . . 7 |- ( f = g -> ( ( dom f = suc n /\ y e. ( F ` ( f ` n ) ) ) <-> ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) ) )
7	6	rexbidv 2551	. . . . . 6 |- ( f = g -> ( E. n e. om ( dom f = suc n /\ y e. ( F ` ( f ` n ) ) ) <-> E. n e. om ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) ) )
8	1	eqeq1d 2247	. . . . . . 7 |- ( f = g -> ( dom f = (/) <-> dom g = (/) ) )
9	8	anbi1d 469	. . . . . 6 |- ( f = g -> ( ( dom f = (/) /\ y e. A ) <-> ( dom g = (/) /\ y e. A ) ) )
10	7, 9	orbi12d 805	. . . . 5 |- ( f = g -> ( ( E. n e. om ( dom f = suc n /\ y e. ( F ` ( f ` n ) ) ) \/ ( dom f = (/) /\ y e. A ) ) <-> ( E. n e. om ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ y e. A ) ) ) )
11	10	abbidv 2358	. . . 4 |- ( f = g -> { y | ( E. n e. om ( dom f = suc n /\ y e. ( F ` ( f ` n ) ) ) \/ ( dom f = (/) /\ y e. A ) ) } = { y | ( E. n e. om ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ y e. A ) ) } )
12	11	cbvmptv 4227	. . 3 |- ( f e. _V |-> { y | ( E. n e. om ( dom f = suc n /\ y e. ( F ` ( f ` n ) ) ) \/ ( dom f = (/) /\ y e. A ) ) } ) = ( g e. _V |-> { y | ( E. n e. om ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ y e. A ) ) } )
13		eleq1 2301	. . . . . . . 8 |- ( y = x -> ( y e. ( F ` ( g ` n ) ) <-> x e. ( F ` ( g ` n ) ) ) )
14	13	anbi2d 468	. . . . . . 7 |- ( y = x -> ( ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) <-> ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) ) )
15	14	rexbidv 2551	. . . . . 6 |- ( y = x -> ( E. n e. om ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) <-> E. n e. om ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) ) )
16		eleq1 2301	. . . . . . 7 |- ( y = x -> ( y e. A <-> x e. A ) )
17	16	anbi2d 468	. . . . . 6 |- ( y = x -> ( ( dom g = (/) /\ y e. A ) <-> ( dom g = (/) /\ x e. A ) ) )
18	15, 17	orbi12d 805	. . . . 5 |- ( y = x -> ( ( E. n e. om ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ y e. A ) ) <-> ( E. n e. om ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ x e. A ) ) ) )
19	18	cbvabv 2365	. . . 4 |- { y | ( E. n e. om ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ y e. A ) ) } = { x | ( E. n e. om ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ x e. A ) ) }
20	19	mpteq2i 4218	. . 3 |- ( g e. _V |-> { y | ( E. n e. om ( dom g = suc n /\ y e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ y e. A ) ) } ) = ( g e. _V |-> { x | ( E. n e. om ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ x e. A ) ) } )
21		suceq 4547	. . . . . . . . 9 |- ( n = m -> suc n = suc m )
22	21	eqeq2d 2250	. . . . . . . 8 |- ( n = m -> ( dom g = suc n <-> dom g = suc m ) )
23		fveq2 5695	. . . . . . . . . 10 |- ( n = m -> ( g ` n ) = ( g ` m ) )
24	23	fveq2d 5699	. . . . . . . . 9 |- ( n = m -> ( F ` ( g ` n ) ) = ( F ` ( g ` m ) ) )
25	24	eleq2d 2308	. . . . . . . 8 |- ( n = m -> ( x e. ( F ` ( g ` n ) ) <-> x e. ( F ` ( g ` m ) ) ) )
26	22, 25	anbi12d 477	. . . . . . 7 |- ( n = m -> ( ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) <-> ( dom g = suc m /\ x e. ( F ` ( g ` m ) ) ) ) )
27	26	cbvrexv 2787	. . . . . 6 |- ( E. n e. om ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) <-> E. m e. om ( dom g = suc m /\ x e. ( F ` ( g ` m ) ) ) )
28	27	orbi1i 775	. . . . 5 |- ( ( E. n e. om ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ x e. A ) ) <-> ( E. m e. om ( dom g = suc m /\ x e. ( F ` ( g ` m ) ) ) \/ ( dom g = (/) /\ x e. A ) ) )
29	28	abbii 2354	. . . 4 |- { x | ( E. n e. om ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ x e. A ) ) } = { x | ( E. m e. om ( dom g = suc m /\ x e. ( F ` ( g ` m ) ) ) \/ ( dom g = (/) /\ x e. A ) ) }
30	29	mpteq2i 4218	. . 3 |- ( g e. _V |-> { x | ( E. n e. om ( dom g = suc n /\ x e. ( F ` ( g ` n ) ) ) \/ ( dom g = (/) /\ x e. A ) ) } ) = ( g e. _V |-> { x | ( E. m e. om ( dom g = suc m /\ x e. ( F ` ( g ` m ) ) ) \/ ( dom g = (/) /\ x e. A ) ) } )
31	12, 20, 30	3eqtri 2263	. 2 |- ( f e. _V |-> { y | ( E. n e. om ( dom f = suc n /\ y e. ( F ` ( f ` n ) ) ) \/ ( dom f = (/) /\ y e. A ) ) } ) = ( g e. _V |-> { x | ( E. m e. om ( dom g = suc m /\ x e. ( F ` ( g ` m ) ) ) \/ ( dom g = (/) /\ x e. A ) ) } )
32	31	frecsuclem 6677	1 |- ( ( A. z e. S ( F ` z ) e. S /\ A e. S /\ B e. om ) -> (frec ( F , A ) ` suc B ) = ( F ` (frec ( F , A ) ` B ) ) )

This proof depends on syntax axioms:   -> wi 4   /\ wa 104   \/ wo 720   /\ w3a 1009   = wceq 1402   e. wcel 2209   {cab 2224   A.wral 2528   E.wrex 2529   _Vcvv 2821   (/)c0 3520   |-> cmpt 4192   suc csuc 4510   omcom 4737   dom cdm 4774   ` cfv 5377  freccfrec 6661

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  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-coll 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-iinf 4735

This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  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-ne 2421  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-tr 4230  df-id 4438  df-iord 4511  df-on 4513  df-ilim 4514  df-suc 4516  df-iom 4738  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-recs 6576  df-frec 6662

This theorem is used by:  frecrdg  6679  frec2uzsucd  10838  frec2uzrdg  10846  frecuzrdgsuc  10851  frecuzrdgg  10853  frecuzrdgsuctlem  10860  seq3val  10897  seqvalcd  10898