Theorem oeiv 6623

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 6588	. . 3 |- 1o e. On
2		vex 2805	. . . . . . 7 |- x e. _V
3		omexg 6618	. . . . . . 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 2606	. . . . 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 5459	. . . . 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 6542	. . . 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 1306	. . 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 1361	. 2 |- ( ( A e. On /\ B e. On ) -> ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) e. _V )
12		oveq2 6025	. . . . . 6 |- ( y = A -> ( x .o y ) = ( x .o A ) )
13	12	mpteq2dv 4180	. . . . 5 |- ( y = A -> ( x e. _V |-> ( x .o y ) ) = ( x e. _V |-> ( x .o A ) ) )
14		rdgeq1 6536	. . . . 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 5641	. . 3 |- ( y = A -> ( rec ( ( x e. _V |-> ( x .o y ) ) , 1o ) ` z ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` z ) )
17		fveq2 5639	. . 3 |- ( z = B -> ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` z ) = ( rec ( ( x e. _V |-> ( x .o A ) ) , 1o ) ` B ) )
18		df-oexpi 6587	. . 3 |- ↑o = ( y e. On , z e. On |-> ( rec ( ( x e. _V |-> ( x .o y ) ) , 1o ) ` z ) )
19	16, 17, 18	ovmpog 6155	. 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 1374	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 1397   e. wcel 2202   A.wral 2510   _Vcvv 2802   |-> cmpt 4150   Oncon0 4460   Fn wfn 5321   ` cfv 5326  (class class class)co 6017   reccrdg 6534   1oc1o 6574   .o comu 6579   ↑_o coei 6580

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-tr 4188  df-id 4390  df-iord 4463  df-on 4465  df-suc 4468  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-ov 6020  df-oprab 6021  df-mpo 6022  df-1st 6302  df-2nd 6303  df-recs 6470  df-irdg 6535  df-1o 6581  df-oadd 6585  df-omul 6586  df-oexpi 6587

This theorem is referenced by:  oei0  6626  oeicl  6629