Theorem smoiun 6466

Description: The value of a strictly monotone ordinal function contains its indexed union. (Contributed by Andrew Salmon, 22-Nov-2011.)

Assertion

Ref	Expression
smoiun	|- ( ( Smo B /\ A e. dom B ) -> U_ x e. A ( B ` x ) C_ ( B ` A ) )

Distinct variable groups:   x, A   x, B

Proof of Theorem smoiun

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eliun 3974	. . 3 |- ( y e. U_ x e. A ( B ` x ) <-> E. x e. A y e. ( B ` x ) )
2		smofvon 6464	. . . . 5 |- ( ( Smo B /\ A e. dom B ) -> ( B ` A ) e. On )
3		smoel 6465	. . . . . 6 |- ( ( Smo B /\ A e. dom B /\ x e. A ) -> ( B ` x ) e. ( B ` A ) )
4	3	3expia 1231	. . . . 5 |- ( ( Smo B /\ A e. dom B ) -> ( x e. A -> ( B ` x ) e. ( B ` A ) ) )
5		ontr1 4486	. . . . . 6 |- ( ( B ` A ) e. On -> ( ( y e. ( B ` x ) /\ ( B ` x ) e. ( B ` A ) ) -> y e. ( B ` A ) ) )
6	5	expcomd 1486	. . . . 5 |- ( ( B ` A ) e. On -> ( ( B ` x ) e. ( B ` A ) -> ( y e. ( B ` x ) -> y e. ( B ` A ) ) ) )
7	2, 4, 6	sylsyld 58	. . . 4 |- ( ( Smo B /\ A e. dom B ) -> ( x e. A -> ( y e. ( B ` x ) -> y e. ( B ` A ) ) ) )
8	7	rexlimdv 2649	. . 3 |- ( ( Smo B /\ A e. dom B ) -> ( E. x e. A y e. ( B ` x ) -> y e. ( B ` A ) ) )
9	1, 8	biimtrid 152	. 2 |- ( ( Smo B /\ A e. dom B ) -> ( y e. U_ x e. A ( B ` x ) -> y e. ( B ` A ) ) )
10	9	ssrdv 3233	1 |- ( ( Smo B /\ A e. dom B ) -> U_ x e. A ( B ` x ) C_ ( B ` A ) )

Syntax hints:   -> wi 4   /\ wa 104   e. wcel 2202   E.wrex 2511   C_ wss 3200   U_ciun 3970   Oncon0 4460   dom cdm 4725   ` cfv 5326   Smo wsmo 6450

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-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-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  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-ral 2515  df-rex 2516  df-v 2804  df-sbc 3032  df-un 3204  df-in 3206  df-ss 3213  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-tr 4188  df-id 4390  df-iord 4463  df-on 4465  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-fv 5334  df-smo 6451

This theorem is referenced by: (None)