Theorem sbthlemi10 7164

Description: Lemma for isbth 7165. (Contributed by NM, 28-Mar-1998.)

Hypotheses

Ref	Expression
sbthlem.1	|- A e. _V
sbthlem.2	|- D = { x | ( x C_ A /\ ( g " ( B \ ( f " x ) ) ) C_ ( A \ x ) ) }
sbthlem.3	|- H = ( ( f |` U. D ) u. ( `' g |` ( A \ U. D ) ) )
sbthlem.4	|- B e. _V

Assertion

Ref	Expression
sbthlemi10	|- ( (EXMID /\ ( A ~<_ B /\ B ~<_ A ) ) -> A ~~ B )

Distinct variable groups:   x, A   x, B   x, D   x, f, g   x, H   f, g, A   B, f, g

Allowed substitution hints:   D( f, g)   H( f, g)

Proof of Theorem sbthlemi10

Step	Hyp	Ref	Expression
1		sbthlem.4	. . . . . 6 |- B e. _V
2	1	brdom 6920	. . . . 5 |- ( A ~<_ B <-> E. f f : A -1-1-> B )
3		sbthlem.1	. . . . . 6 |- A e. _V
4	3	brdom 6920	. . . . 5 |- ( B ~<_ A <-> E. g g : B -1-1-> A )
5	2, 4	anbi12i 460	. . . 4 |- ( ( A ~<_ B /\ B ~<_ A ) <-> ( E. f f : A -1-1-> B /\ E. g g : B -1-1-> A ) )
6		eeanv 1985	. . . 4 |- ( E. f E. g ( f : A -1-1-> B /\ g : B -1-1-> A ) <-> ( E. f f : A -1-1-> B /\ E. g g : B -1-1-> A ) )
7	5, 6	bitr4i 187	. . 3 |- ( ( A ~<_ B /\ B ~<_ A ) <-> E. f E. g ( f : A -1-1-> B /\ g : B -1-1-> A ) )
8		sbthlem.3	. . . . . . 7 |- H = ( ( f |` U. D ) u. ( `' g |` ( A \ U. D ) ) )
9		vex 2805	. . . . . . . . 9 |- f e. _V
10	9	resex 5054	. . . . . . . 8 |- ( f |` U. D ) e. _V
11		vex 2805	. . . . . . . . . 10 |- g e. _V
12	11	cnvex 5275	. . . . . . . . 9 |- `' g e. _V
13	12	resex 5054	. . . . . . . 8 |- ( `' g |` ( A \ U. D ) ) e. _V
14	10, 13	unex 4538	. . . . . . 7 |- ( ( f |` U. D ) u. ( `' g |` ( A \ U. D ) ) ) e. _V
15	8, 14	eqeltri 2304	. . . . . 6 |- H e. _V
16		sbthlem.2	. . . . . . 7 |- D = { x | ( x C_ A /\ ( g " ( B \ ( f " x ) ) ) C_ ( A \ x ) ) }
17	3, 16, 8	sbthlemi9 7163	. . . . . 6 |- ( (EXMID /\ f : A -1-1-> B /\ g : B -1-1-> A ) -> H : A -1-1-onto-> B )
18		f1oen3g 6926	. . . . . 6 |- ( ( H e. _V /\ H : A -1-1-onto-> B ) -> A ~~ B )
19	15, 17, 18	sylancr 414	. . . . 5 |- ( (EXMID /\ f : A -1-1-> B /\ g : B -1-1-> A ) -> A ~~ B )
20	19	3expib 1232	. . . 4 |- (EXMID -> ( ( f : A -1-1-> B /\ g : B -1-1-> A ) -> A ~~ B ) )
21	20	exlimdvv 1946	. . 3 |- (EXMID -> ( E. f E. g ( f : A -1-1-> B /\ g : B -1-1-> A ) -> A ~~ B ) )
22	7, 21	biimtrid 152	. 2 |- (EXMID -> ( ( A ~<_ B /\ B ~<_ A ) -> A ~~ B ) )
23	22	imp 124	1 |- ( (EXMID /\ ( A ~<_ B /\ B ~<_ A ) ) -> A ~~ B )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 1004   = wceq 1397   E.wex 1540   e. wcel 2202   {cab 2217   _Vcvv 2802   \ cdif 3197   u. cun 3198   C_ wss 3200   U.cuni 3893   class class class wbr 4088  EXMIDwem 4284   `'ccnv 4724   |` cres 4727   "cima 4728   -1-1->wf1 5323   -1-1-onto->wf1o 5325   ~~ cen 6906   ~<_ cdom 6907

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-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530

This theorem depends on definitions:  df-bi 117  df-stab 838  df-dc 842  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-rab 2519  df-v 2804  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-br 4089  df-opab 4151  df-exmid 4285  df-id 4390  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-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-en 6909  df-dom 6910

This theorem is referenced by:  isbth  7165