Theorem isneip 14814

Description: The predicate "the class N is a neighborhood of point P". (Contributed by NM, 26-Feb-2007.)

Hypothesis

Ref	Expression
neifval.1	|- X = U. J

Assertion

Ref	Expression
isneip	|- ( ( J e. Top /\ P e. X ) -> ( N e. ( ( nei ` J ) ` { P } ) <-> ( N C_ X /\ E. g e. J ( P e. g /\ g C_ N ) ) ) )

Distinct variable groups:   g, J   g, N   P, g   g, X

Proof of Theorem isneip

Step	Hyp	Ref	Expression
1		snssi 3811	. . 3 |- ( P e. X -> { P } C_ X )
2		neifval.1	. . . 4 |- X = U. J
3	2	isnei 14812	. . 3 |- ( ( J e. Top /\ { P } C_ X ) -> ( N e. ( ( nei ` J ) ` { P } ) <-> ( N C_ X /\ E. g e. J ( { P } C_ g /\ g C_ N ) ) ) )
4	1, 3	sylan2 286	. 2 |- ( ( J e. Top /\ P e. X ) -> ( N e. ( ( nei ` J ) ` { P } ) <-> ( N C_ X /\ E. g e. J ( { P } C_ g /\ g C_ N ) ) ) )
5		snssg 3801	. . . . . 6 |- ( P e. X -> ( P e. g <-> { P } C_ g ) )
6	5	anbi1d 465	. . . . 5 |- ( P e. X -> ( ( P e. g /\ g C_ N ) <-> ( { P } C_ g /\ g C_ N ) ) )
7	6	rexbidv 2531	. . . 4 |- ( P e. X -> ( E. g e. J ( P e. g /\ g C_ N ) <-> E. g e. J ( { P } C_ g /\ g C_ N ) ) )
8	7	anbi2d 464	. . 3 |- ( P e. X -> ( ( N C_ X /\ E. g e. J ( P e. g /\ g C_ N ) ) <-> ( N C_ X /\ E. g e. J ( { P } C_ g /\ g C_ N ) ) ) )
9	8	adantl 277	. 2 |- ( ( J e. Top /\ P e. X ) -> ( ( N C_ X /\ E. g e. J ( P e. g /\ g C_ N ) ) <-> ( N C_ X /\ E. g e. J ( { P } C_ g /\ g C_ N ) ) ) )
10	4, 9	bitr4d 191	1 |- ( ( J e. Top /\ P e. X ) -> ( N e. ( ( nei ` J ) ` { P } ) <-> ( N C_ X /\ E. g e. J ( P e. g /\ g C_ N ) ) ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1395   e. wcel 2200   E.wrex 2509   C_ wss 3197   {csn 3666   U.cuni 3887   ` cfv 5317   Topctop 14665   neicnei 14806

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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-coll 4198  ax-sep 4201  ax-pow 4257  ax-pr 4292

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-iun 3966  df-br 4083  df-opab 4145  df-mpt 4146  df-id 4383  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-rn 4729  df-res 4730  df-ima 4731  df-iota 5277  df-fun 5319  df-fn 5320  df-f 5321  df-f1 5322  df-fo 5323  df-f1o 5324  df-fv 5325  df-top 14666  df-nei 14807

This theorem is referenced by:  neipsm  14822  cnpnei  14887  neibl  15159