Theorem ssnei 19370

Description: A set is included in its neighborhoods. Proposition Viii of [BourbakiTop1] p. I.3 . (Contributed by FL, 16-Nov-2006.)

Assertion

Ref	Expression
ssnei	|- ( ( J e. Top /\ N e. ( ( nei ` J ) ` S ) ) -> S C_ N )

Proof of Theorem ssnei

Dummy variable g is distinct from all other variables.

Step	Hyp	Ref	Expression
1		neii2 19368	. 2 |- ( ( J e. Top /\ N e. ( ( nei ` J ) ` S ) ) -> E. g e. J ( S C_ g /\ g C_ N ) )
2		sstr 3505	. . 3 |- ( ( S C_ g /\ g C_ N ) -> S C_ N )
3	2	rexlimivw 2945	. 2 |- ( E. g e. J ( S C_ g /\ g C_ N ) -> S C_ N )
4	1, 3	syl 16	1 |- ( ( J e. Top /\ N e. ( ( nei ` J ) ` S ) ) -> S C_ N )

Syntax hints:   -> wi 4   /\ wa 369   e. wcel 1762   E.wrex 2808   C_ wss 3469   ` cfv 5579   Topctop 19154   neicnei 19357

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1596  ax-4 1607  ax-5 1675  ax-6 1714  ax-7 1734  ax-8 1764  ax-9 1766  ax-10 1781  ax-11 1786  ax-12 1798  ax-13 1961  ax-ext 2438  ax-rep 4551  ax-sep 4561  ax-nul 4569  ax-pow 4618  ax-pr 4679

This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 970  df-tru 1377  df-ex 1592  df-nf 1595  df-sb 1707  df-eu 2272  df-mo 2273  df-clab 2446  df-cleq 2452  df-clel 2455  df-nfc 2610  df-ne 2657  df-ral 2812  df-rex 2813  df-reu 2814  df-rab 2816  df-v 3108  df-sbc 3325  df-csb 3429  df-dif 3472  df-un 3474  df-in 3476  df-ss 3483  df-nul 3779  df-if 3933  df-pw 4005  df-sn 4021  df-pr 4023  df-op 4027  df-uni 4239  df-iun 4320  df-br 4441  df-opab 4499  df-mpt 4500  df-id 4788  df-xp 4998  df-rel 4999  df-cnv 5000  df-co 5001  df-dm 5002  df-rn 5003  df-res 5004  df-ima 5005  df-iota 5542  df-fun 5581  df-fn 5582  df-f 5583  df-f1 5584  df-fo 5585  df-f1o 5586  df-fv 5587  df-top 19159  df-nei 19358

This theorem is referenced by:  elnei  19371  0nnei  19372  opnneissb  19374  opnssneib  19375  tpnei  19381  cvmlift2lem1  28373