Theorem oeiv 6282

Description: Value of ordinal exponentiation. (Contributed by Jim Kingdon, 9-Jul-2019.)

Assertion

Ref	Expression
oeiv	|- ( ( A e. On /\ B e. On ) -> ( A ↑o B ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) )

Distinct variable group:   x, A

Allowed substitution hint:   B( x)

Proof of Theorem oeiv

Dummy variables y z are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		1on 6250	. . 3 |- 1o e. On
2		vex 2644	. . . . . . 7 |- x e. _V
3		omexg 6277	. . . . . . 7 |- ( ( x e. _V /\ A e. On ) -> ( x .o A ) e. _V )
4	2, 3	mpan 418	. . . . . 6 |- ( A e. On -> ( x .o A ) e. _V )
5	4	ralrimivw 2465	. . . . 5 |- ( A e. On -> A. x e. _V ( x .o A ) e. _V )
6		eqid 2100	. . . . . 6 |- ( x e. _V |-> ( x .o A ) ) = ( x e. _V |-> ( x .o A ) )
7	6	fnmpt 5185	. . . . 5 |- ( A. x e. _V ( x .o A ) e. _V -> ( x e. _V |-> ( x .o A ) ) Fn _V )
8	5, 7	syl 14	. . . 4 |- ( A e. On -> ( x e. _V |-> ( x .o A ) ) Fn _V )
9		rdgexggg 6204	. . . 4 |- ( ( ( x e. _V |-> ( x .o A ) ) Fn _V /\ 1o e. On /\ B e. On ) -> ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) e. _V )
10	8, 9	syl3an1 1217	. . 3 |- ( ( A e. On /\ 1o e. On /\ B e. On ) -> ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) e. _V )
11	1, 10	mp3an2 1271	. 2 |- ( ( A e. On /\ B e. On ) -> ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) e. _V )
12		oveq2 5714	. . . . . 6 |- ( y = A -> ( x .o y ) = ( x .o A ) )
13	12	mpteq2dv 3959	. . . . 5 |- ( y = A -> ( x e. _V |-> ( x .o y ) ) = ( x e. _V |-> ( x .o A ) ) )
14		rdgeq1 6198	. . . . 5 |- ( ( x e. _V |-> ( x .o y ) ) = ( x e. _V |-> ( x .o A ) ) -> rec ( ( x e. _V |-> ( x .o y ) ) , 1o ) = rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) )
15	13, 14	syl 14	. . . 4 |- ( y = A -> rec ( ( x e. _V |-> ( x .o y ) ) , 1o ) = rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) )
16	15	fveq1d 5355	. . 3 |- ( y = A -> ( rec ( ( x e. _V |-> ( x .o y ) ) , 1o ) ` z ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` z ) )
17		fveq2 5353	. . 3 |- ( z = B -> ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` z ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) )
18		df-oexpi 6249	. . 3 |- ↑o = ( y e. On , z e. On |-> ( rec ( ( x e. _V |-> ( x .o y ) ) , 1o ) ` z ) )
19	16, 17, 18	ovmpog 5837	. 2 |- ( ( A e. On /\ B e. On /\ ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) e. _V ) -> ( A ↑o B ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) )
20	11, 19	mpd3an3 1284	1 |- ( ( A e. On /\ B e. On ) -> ( A ↑o B ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) )

Syntax hints:   -> wi 4   /\ wa 103   = wceq 1299   e. wcel 1448   A.wral 2375   _Vcvv 2641   |-> cmpt 3929   Oncon0 4223   Fn wfn 5054   ` cfv 5059  (class class class)co 5706   reccrdg 6196   1oc1o 6236   .o comu 6241   ↑_o coei 6242

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 584  ax-in2 585  ax-io 671  ax-5 1391  ax-7 1392  ax-gen 1393  ax-ie1 1437  ax-ie2 1438  ax-8 1450  ax-10 1451  ax-11 1452  ax-i12 1453  ax-bndl 1454  ax-4 1455  ax-13 1459  ax-14 1460  ax-17 1474  ax-i9 1478  ax-ial 1482  ax-i5r 1483  ax-ext 2082  ax-coll 3983  ax-sep 3986  ax-nul 3994  ax-pow 4038  ax-pr 4069  ax-un 4293  ax-setind 4390

This theorem depends on definitions:  df-bi 116  df-3an 932  df-tru 1302  df-fal 1305  df-nf 1405  df-sb 1704  df-eu 1963  df-mo 1964  df-clab 2087  df-cleq 2093  df-clel 2096  df-nfc 2229  df-ne 2268  df-ral 2380  df-rex 2381  df-reu 2382  df-rab 2384  df-v 2643  df-sbc 2863  df-csb 2956  df-dif 3023  df-un 3025  df-in 3027  df-ss 3034  df-nul 3311  df-pw 3459  df-sn 3480  df-pr 3481  df-op 3483  df-uni 3684  df-iun 3762  df-br 3876  df-opab 3930  df-mpt 3931  df-tr 3967  df-id 4153  df-iord 4226  df-on 4228  df-suc 4231  df-xp 4483  df-rel 4484  df-cnv 4485  df-co 4486  df-dm 4487  df-rn 4488  df-res 4489  df-ima 4490  df-iota 5024  df-fun 5061  df-fn 5062  df-f 5063  df-f1 5064  df-fo 5065  df-f1o 5066  df-fv 5067  df-ov 5709  df-oprab 5710  df-mpo 5711  df-1st 5969  df-2nd 5970  df-recs 6132  df-irdg 6197  df-1o 6243  df-oadd 6247  df-omul 6248  df-oexpi 6249

This theorem is referenced by:  oei0  6285  oeicl  6288