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Theorem en3lplem2 7946
Description: Lemma for en3lp 7947. (Contributed by Alan Sare, 28-Oct-2011.)
Assertion
Ref Expression
en3lplem2 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> ( x i^i { A , B , C } ) =/= (/) ) )
Distinct variable groups:   x, A   x, B   x, C
Proof of Theorem en3lplem2
StepHypRef Expression
1 en3lplem1 7945 . . . . 5 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x = A -> ( x i^i { A , B , C } ) =/= (/) ) )
2 en3lplem1 7945 . . . . . . . 8 |- ( ( B e. C /\ C e. A /\ A e. B ) -> ( x = B -> ( x i^i { B , C , A } ) =/= (/) ) )
323comr 1202 . . . . . . 7 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x = B -> ( x i^i { B , C , A } ) =/= (/) ) )
43a1d 25 . . . . . 6 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> ( x = B -> ( x i^i { B , C , A } ) =/= (/) ) ) )
5 tprot 4039 . . . . . . . . 9 |- { A , B , C } = { B , C , A }
65ineq2i 3611 . . . . . . . 8 |- ( x i^i { A , B , C } ) = ( x i^i { B , C , A } )
76neeq1i 2667 . . . . . . 7 |- ( ( x i^i { A , B , C } ) =/= (/) <-> ( x i^i { B , C , A } ) =/= (/) )
87bicomi 202 . . . . . 6 |- ( ( x i^i { B , C , A } ) =/= (/) <-> ( x i^i { A , B , C } ) =/= (/) )
94, 8syl8ib 231 . . . . 5 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> ( x = B -> ( x i^i { A , B , C } ) =/= (/) ) ) )
10 jao 510 . . . . 5 |- ( ( x = A -> ( x i^i { A , B , C } ) =/= (/) ) -> ( ( x = B -> ( x i^i { A , B , C } ) =/= (/) ) -> ( ( x = A \/ x = B ) -> ( x i^i { A , B , C } ) =/= (/) ) ) )
111, 9, 10sylsyld 56 . . . 4 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> ( ( x = A \/ x = B ) -> ( x i^i { A , B , C } ) =/= (/) ) ) )
1211imp 427 . . 3 |- ( ( ( A e. B /\ B e. C /\ C e. A ) /\ x e. { A , B , C } ) -> ( ( x = A \/ x = B ) -> ( x i^i { A , B , C } ) =/= (/) ) )
13 en3lplem1 7945 . . . . . . 7 |- ( ( C e. A /\ A e. B /\ B e. C ) -> ( x = C -> ( x i^i { C , A , B } ) =/= (/) ) )
14133coml 1201 . . . . . 6 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x = C -> ( x i^i { C , A , B } ) =/= (/) ) )
1514a1d 25 . . . . 5 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> ( x = C -> ( x i^i { C , A , B } ) =/= (/) ) ) )
16 tprot 4039 . . . . . . 7 |- { C , A , B } = { A , B , C }
1716ineq2i 3611 . . . . . 6 |- ( x i^i { C , A , B } ) = ( x i^i { A , B , C } )
1817neeq1i 2667 . . . . 5 |- ( ( x i^i { C , A , B } ) =/= (/) <-> ( x i^i { A , B , C } ) =/= (/) )
1915, 18syl8ib 231 . . . 4 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> ( x = C -> ( x i^i { A , B , C } ) =/= (/) ) ) )
2019imp 427 . . 3 |- ( ( ( A e. B /\ B e. C /\ C e. A ) /\ x e. { A , B , C } ) -> ( x = C -> ( x i^i { A , B , C } ) =/= (/) ) )
21 idd 24 . . . . . . 7 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> x e. { A , B , C } ) )
22 dftp2 3990 . . . . . . . 8 |- { A , B , C } = { x | ( x = A \/ x = B \/ x = C ) }
2322eleq2i 2460 . . . . . . 7 |- ( x e. { A , B , C } <-> x e. { x | ( x = A \/ x = B \/ x = C ) } )
2421, 23syl6ib 226 . . . . . 6 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> x e. { x | ( x = A \/ x = B \/ x = C ) } ) )
25 abid 2369 . . . . . 6 |- ( x e. { x | ( x = A \/ x = B \/ x = C ) } <-> ( x = A \/ x = B \/ x = C ) )
2624, 25syl6ib 226 . . . . 5 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> ( x = A \/ x = B \/ x = C ) ) )
27 df-3or 972 . . . . 5 |- ( ( x = A \/ x = B \/ x = C ) <-> ( ( x = A \/ x = B ) \/ x = C ) )
2826, 27syl6ib 226 . . . 4 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> ( ( x = A \/ x = B ) \/ x = C ) ) )
2928imp 427 . . 3 |- ( ( ( A e. B /\ B e. C /\ C e. A ) /\ x e. { A , B , C } ) -> ( ( x = A \/ x = B ) \/ x = C ) )
3012, 20, 29mpjaod 379 . 2 |- ( ( ( A e. B /\ B e. C /\ C e. A ) /\ x e. { A , B , C } ) -> ( x i^i { A , B , C } ) =/= (/) )
3130ex 432 1 |- ( ( A e. B /\ B e. C /\ C e. A ) -> ( x e. { A , B , C } -> ( x i^i { A , B , C } ) =/= (/) ) )
Colors of variables: wff setvar class
Syntax hints:   -> wi 4   \/ wo 366   /\ wa 367   \/ w3o 970   /\ w3a 971   = wceq 1399   e. wcel 1826   {cab 2367   =/= wne 2577   i^i cin 3388   (/)c0 3711   {ctp 3948
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1626  ax-4 1639  ax-5 1712  ax-6 1755  ax-7 1798  ax-10 1845  ax-11 1850  ax-12 1862  ax-13 2006  ax-ext 2360
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3or 972  df-3an 973  df-tru 1402  df-ex 1621  df-nf 1625  df-sb 1748  df-clab 2368  df-cleq 2374  df-clel 2377  df-nfc 2532  df-ne 2579  df-v 3036  df-dif 3392  df-un 3394  df-in 3396  df-nul 3712  df-sn 3945  df-pr 3947  df-tp 3949
This theorem is referenced by:  en3lp  7947
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