Theorem omcl 6605

Description: Closure law for ordinal multiplication. Proposition 8.16 of [TakeutiZaring] p. 57. (Contributed by NM, 3-Aug-2004.) (Constructive proof by Jim Kingdon, 26-Jul-2019.)

Assertion

Ref	Expression
omcl	|- ( ( A e. On /\ B e. On ) -> ( A .o B ) e. On )

Proof of Theorem omcl

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

Step	Hyp	Ref	Expression
1		omv 6599	. 2 |- ( ( A e. On /\ B e. On ) -> ( A .o B ) = ( rec ( ( x e. _V |-> ( x +o A ) ) , (/) ) ` B ) )
2		0elon 4482	. . . 4 |- (/) e. On
3	2	a1i 9	. . 3 |- ( A e. On -> (/) e. On )
4		vex 2802	. . . . . . 7 |- y e. _V
5		oacl 6604	. . . . . . 7 |- ( ( y e. On /\ A e. On ) -> ( y +o A ) e. On )
6		oveq1 6007	. . . . . . . 8 |- ( x = y -> ( x +o A ) = ( y +o A ) )
7		eqid 2229	. . . . . . . 8 |- ( x e. _V |-> ( x +o A ) ) = ( x e. _V |-> ( x +o A ) )
8	6, 7	fvmptg 5709	. . . . . . 7 |- ( ( y e. _V /\ ( y +o A ) e. On ) -> ( ( x e. _V |-> ( x +o A ) ) ` y ) = ( y +o A ) )
9	4, 5, 8	sylancr 414	. . . . . 6 |- ( ( y e. On /\ A e. On ) -> ( ( x e. _V |-> ( x +o A ) ) ` y ) = ( y +o A ) )
10	9, 5	eqeltrd 2306	. . . . 5 |- ( ( y e. On /\ A e. On ) -> ( ( x e. _V |-> ( x +o A ) ) ` y ) e. On )
11	10	ancoms 268	. . . 4 |- ( ( A e. On /\ y e. On ) -> ( ( x e. _V |-> ( x +o A ) ) ` y ) e. On )
12	11	ralrimiva 2603	. . 3 |- ( A e. On -> A. y e. On ( ( x e. _V |-> ( x +o A ) ) ` y ) e. On )
13	3, 12	rdgon 6530	. 2 |- ( ( A e. On /\ B e. On ) -> ( rec ( ( x e. _V |-> ( x +o A ) ) , (/) ) ` B ) e. On )
14	1, 13	eqeltrd 2306	1 |- ( ( A e. On /\ B e. On ) -> ( A .o B ) e. On )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1395   e. wcel 2200   _Vcvv 2799   (/)c0 3491   |-> cmpt 4144   Oncon0 4453   ` cfv 5317  (class class class)co 6000   reccrdg 6513   +o coa 6557   .o comu 6558

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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4198  ax-sep 4201  ax-nul 4209  ax-pow 4257  ax-pr 4292  ax-un 4523  ax-setind 4628

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-iun 3966  df-br 4083  df-opab 4145  df-mpt 4146  df-tr 4182  df-id 4383  df-iord 4456  df-on 4458  df-suc 4461  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-rn 4729  df-res 4730  df-ima 4731  df-iota 5277  df-fun 5319  df-fn 5320  df-f 5321  df-f1 5322  df-fo 5323  df-f1o 5324  df-fv 5325  df-ov 6003  df-oprab 6004  df-mpo 6005  df-1st 6284  df-2nd 6285  df-recs 6449  df-irdg 6514  df-oadd 6564  df-omul 6565

This theorem is referenced by:  oeicl  6606  omv2  6609  omsuc  6616