Theorem bm2.5ii 4618

Description: Problem 2.5(ii) of [BellMachover] p. 471. (Contributed by NM, 20-Sep-2003.)

Hypothesis

Ref	Expression
bm2.5ii.1	|- A e. _V

Assertion

Ref	Expression
bm2.5ii	|- ( A C_ On -> U. A = |^| { x e. On | A. y e. A y C_ x } )

Distinct variable group:   x, y, A

Proof of Theorem bm2.5ii

Step	Hyp	Ref	Expression
1		bm2.5ii.1	. . 3 |- A e. _V
2	1	ssonunii 4611	. 2 |- ( A C_ On -> U. A e. On )
3		intmin 3969	. . 3 |- ( U. A e. On -> |^| { x e. On | U. A C_ x } = U. A )
4		unissb 3944	. . . . . 6 |- ( U. A C_ x <-> A. y e. A y C_ x )
5	4	a1i 9	. . . . 5 |- ( x e. On -> ( U. A C_ x <-> A. y e. A y C_ x ) )
6	5	rabbiia 2799	. . . 4 |- { x e. On | U. A C_ x } = { x e. On | A. y e. A y C_ x }
7	6	inteqi 3953	. . 3 |- |^| { x e. On | U. A C_ x } = |^| { x e. On | A. y e. A y C_ x }
8	3, 7	eqtr3di 2280	. 2 |- ( U. A e. On -> U. A = |^| { x e. On | A. y e. A y C_ x } )
9	2, 8	syl 14	1 |- ( A C_ On -> U. A = |^| { x e. On | A. y e. A y C_ x } )

Syntax hints:   -> wi 4   <-> wb 105   = wceq 1398   e. wcel 2203   A.wral 2520   {crab 2524   _Vcvv 2813   C_ wss 3211   U.cuni 3914   |^|cint 3949   Oncon0 4484

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 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 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-un 4554

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-rab 2529  df-v 2815  df-in 3217  df-ss 3224  df-uni 3915  df-int 3950  df-tr 4209  df-iord 4487  df-on 4489

This theorem is referenced by: (None)