Theorem dfco2a 5283

Description: Generalization of dfco2 5282, where C can have any value between dom A i^i ran B and _V. (Contributed by NM, 21-Dec-2008.) (Proof shortened by Andrew Salmon, 27-Aug-2011.)

Assertion

Ref	Expression
dfco2a	|- ( ( dom A i^i ran B ) C_ C -> ( A o. B ) = U_ x e. C ( ( `' B " { x } ) X. ( A " { x } ) ) )

Distinct variable groups:   x, A   x, B   x, C

Proof of Theorem dfco2a

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

Step	Hyp	Ref	Expression
1		dfco2 5282	. 2 |- ( A o. B ) = U_ x e. _V ( ( `' B " { x } ) X. ( A " { x } ) )
2		vex 2824	. . . . . . . . . . . . . 14 |- x e. _V
3		vex 2824	. . . . . . . . . . . . . . 15 |- z e. _V
4	3	eliniseg 5152	. . . . . . . . . . . . . 14 |- ( x e. _V -> ( z e. ( `' B " { x } ) <-> z B x ) )
5	2, 4	ax-mp 5	. . . . . . . . . . . . 13 |- ( z e. ( `' B " { x } ) <-> z B x )
6	3, 2	brelrn 5010	. . . . . . . . . . . . 13 |- ( z B x -> x e. ran B )
7	5, 6	sylbi 121	. . . . . . . . . . . 12 |- ( z e. ( `' B " { x } ) -> x e. ran B )
8		vex 2824	. . . . . . . . . . . . . 14 |- w e. _V
9	2, 8	elimasn 5149	. . . . . . . . . . . . 13 |- ( w e. ( A " { x } ) <-> <. x , w >. e. A )
10	2, 8	opeldm 4979	. . . . . . . . . . . . 13 |- ( <. x , w >. e. A -> x e. dom A )
11	9, 10	sylbi 121	. . . . . . . . . . . 12 |- ( w e. ( A " { x } ) -> x e. dom A )
12	7, 11	anim12ci 339	. . . . . . . . . . 11 |- ( ( z e. ( `' B " { x } ) /\ w e. ( A " { x } ) ) -> ( x e. dom A /\ x e. ran B ) )
13	12	adantl 277	. . . . . . . . . 10 |- ( ( y = <. z , w >. /\ ( z e. ( `' B " { x } ) /\ w e. ( A " { x } ) ) ) -> ( x e. dom A /\ x e. ran B ) )
14	13	exlimivv 1952	. . . . . . . . 9 |- ( E. z E. w ( y = <. z , w >. /\ ( z e. ( `' B " { x } ) /\ w e. ( A " { x } ) ) ) -> ( x e. dom A /\ x e. ran B ) )
15		elxp 4786	. . . . . . . . 9 |- ( y e. ( ( `' B " { x } ) X. ( A " { x } ) ) <-> E. z E. w ( y = <. z , w >. /\ ( z e. ( `' B " { x } ) /\ w e. ( A " { x } ) ) ) )
16		elin 3412	. . . . . . . . 9 |- ( x e. ( dom A i^i ran B ) <-> ( x e. dom A /\ x e. ran B ) )
17	14, 15, 16	3imtr4i 201	. . . . . . . 8 |- ( y e. ( ( `' B " { x } ) X. ( A " { x } ) ) -> x e. ( dom A i^i ran B ) )
18		ssel 3242	. . . . . . . 8 |- ( ( dom A i^i ran B ) C_ C -> ( x e. ( dom A i^i ran B ) -> x e. C ) )
19	17, 18	syl5 32	. . . . . . 7 |- ( ( dom A i^i ran B ) C_ C -> ( y e. ( ( `' B " { x } ) X. ( A " { x } ) ) -> x e. C ) )
20	19	pm4.71rd 398	. . . . . 6 |- ( ( dom A i^i ran B ) C_ C -> ( y e. ( ( `' B " { x } ) X. ( A " { x } ) ) <-> ( x e. C /\ y e. ( ( `' B " { x } ) X. ( A " { x } ) ) ) ) )
21	20	exbidv 1878	. . . . 5 |- ( ( dom A i^i ran B ) C_ C -> ( E. x y e. ( ( `' B " { x } ) X. ( A " { x } ) ) <-> E. x ( x e. C /\ y e. ( ( `' B " { x } ) X. ( A " { x } ) ) ) ) )
22		rexv 2840	. . . . 5 |- ( E. x e. _V y e. ( ( `' B " { x } ) X. ( A " { x } ) ) <-> E. x y e. ( ( `' B " { x } ) X. ( A " { x } ) ) )
23		df-rex 2534	. . . . 5 |- ( E. x e. C y e. ( ( `' B " { x } ) X. ( A " { x } ) ) <-> E. x ( x e. C /\ y e. ( ( `' B " { x } ) X. ( A " { x } ) ) ) )
24	21, 22, 23	3bitr4g 223	. . . 4 |- ( ( dom A i^i ran B ) C_ C -> ( E. x e. _V y e. ( ( `' B " { x } ) X. ( A " { x } ) ) <-> E. x e. C y e. ( ( `' B " { x } ) X. ( A " { x } ) ) ) )
25		eliun 4011	. . . 4 |- ( y e. U_ x e. _V ( ( `' B " { x } ) X. ( A " { x } ) ) <-> E. x e. _V y e. ( ( `' B " { x } ) X. ( A " { x } ) ) )
26		eliun 4011	. . . 4 |- ( y e. U_ x e. C ( ( `' B " { x } ) X. ( A " { x } ) ) <-> E. x e. C y e. ( ( `' B " { x } ) X. ( A " { x } ) ) )
27	24, 25, 26	3bitr4g 223	. . 3 |- ( ( dom A i^i ran B ) C_ C -> ( y e. U_ x e. _V ( ( `' B " { x } ) X. ( A " { x } ) ) <-> y e. U_ x e. C ( ( `' B " { x } ) X. ( A " { x } ) ) ) )
28	27	eqrdv 2236	. 2 |- ( ( dom A i^i ran B ) C_ C -> U_ x e. _V ( ( `' B " { x } ) X. ( A " { x } ) ) = U_ x e. C ( ( `' B " { x } ) X. ( A " { x } ) ) )
29	1, 28	eqtrid 2283	1 |- ( ( dom A i^i ran B ) C_ C -> ( A o. B ) = U_ x e. C ( ( `' B " { x } ) X. ( A " { x } ) ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1402   E.wex 1545   e. wcel 2209   E.wrex 2529   _Vcvv 2821   i^i cin 3219   C_ wss 3220   {csn 3705   <.cop 3708   U_ciun 4007   class class class wbr 4125   X. cxp 4767   `'ccnv 4768   dom cdm 4769   ran crn 4770   "cima 4772   o. ccom 4773

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-iun 4009  df-br 4126  df-opab 4188  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782

This theorem is referenced by: (None)