Theorem oeiv 6667

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 6632	. . 3 |- 1o e. On
2		vex 2806	. . . . . . 7 |- x e. _V
3		omexg 6662	. . . . . . 7 |- ( ( x e. _V /\ A e. On ) -> ( x .o A ) e. _V )
4	2, 3	mpan 424	. . . . . 6 |- ( A e. On -> ( x .o A ) e. _V )
5	4	ralrimivw 2607	. . . . 5 |- ( A e. On -> A. x e. _V ( x .o A ) e. _V )
6		eqid 2231	. . . . . 6 |- ( x e. _V |-> ( x .o A ) ) = ( x e. _V |-> ( x .o A ) )
7	6	fnmpt 5466	. . . . 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 6586	. . . 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 1307	. . 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 1362	. 2 |- ( ( A e. On /\ B e. On ) -> ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) e. _V )
12		oveq2 6036	. . . . . 6 |- ( y = A -> ( x .o y ) = ( x .o A ) )
13	12	mpteq2dv 4185	. . . . 5 |- ( y = A -> ( x e. _V |-> ( x .o y ) ) = ( x e. _V |-> ( x .o A ) ) )
14		rdgeq1 6580	. . . . 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 5650	. . 3 |- ( y = A -> ( rec ( ( x e. _V |-> ( x .o y ) ) , 1o ) ` z ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` z ) )
17		fveq2 5648	. . 3 |- ( z = B -> ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` z ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) )
18		df-oexpi 6631	. . 3 |- ↑o = ( y e. On , z e. On |-> ( rec ( ( x e. _V |-> ( x .o y ) ) , 1o ) ` z ) )
19	16, 17, 18	ovmpog 6166	. 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 1375	1 |- ( ( A e. On /\ B e. On ) -> ( A ↑o B ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1398   e. wcel 2202   A.wral 2511   _Vcvv 2803   |-> cmpt 4155   Oncon0 4466   Fn wfn 5328   ` cfv 5333  (class class class)co 6028   reccrdg 6578   1oc1o 6618   .o comu 6623   ↑_o coei 6624

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-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4209  ax-sep 4212  ax-nul 4220  ax-pow 4270  ax-pr 4305  ax-un 4536  ax-setind 4641

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404  df-ral 2516  df-rex 2517  df-reu 2518  df-rab 2520  df-v 2805  df-sbc 3033  df-csb 3129  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-nul 3497  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-iun 3977  df-br 4094  df-opab 4156  df-mpt 4157  df-tr 4193  df-id 4396  df-iord 4469  df-on 4471  df-suc 4474  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-res 4743  df-ima 4744  df-iota 5293  df-fun 5335  df-fn 5336  df-f 5337  df-f1 5338  df-fo 5339  df-f1o 5340  df-fv 5341  df-ov 6031  df-oprab 6032  df-mpo 6033  df-1st 6312  df-2nd 6313  df-recs 6514  df-irdg 6579  df-1o 6625  df-oadd 6629  df-omul 6630  df-oexpi 6631

This theorem is referenced by:  oei0  6670  oeicl  6673