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Theorem elnei 14875
Description: A point belongs to any of its neighborhoods. Property Viii of [BourbakiTop1] p. I.3. (Contributed by FL, 28-Sep-2006.)
Assertion
Ref Expression
elnei  |-  ( ( J  e.  Top  /\  P  e.  A  /\  N  e.  ( ( nei `  J ) `  { P } ) )  ->  P  e.  N
)

Proof of Theorem elnei
StepHypRef Expression
1 ssnei 14874 . . 3  |-  ( ( J  e.  Top  /\  N  e.  ( ( nei `  J ) `  { P } ) )  ->  { P }  C_  N )
213adant2 1042 . 2  |-  ( ( J  e.  Top  /\  P  e.  A  /\  N  e.  ( ( nei `  J ) `  { P } ) )  ->  { P }  C_  N )
3 snssg 3807 . . 3  |-  ( P  e.  A  ->  ( P  e.  N  <->  { P }  C_  N ) )
433ad2ant2 1045 . 2  |-  ( ( J  e.  Top  /\  P  e.  A  /\  N  e.  ( ( nei `  J ) `  { P } ) )  ->  ( P  e.  N  <->  { P }  C_  N ) )
52, 4mpbird 167 1  |-  ( ( J  e.  Top  /\  P  e.  A  /\  N  e.  ( ( nei `  J ) `  { P } ) )  ->  P  e.  N
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105    /\ w3a 1004    e. wcel 2202    C_ wss 3200   {csn 3669   ` cfv 5326   Topctop 14720   neicnei 14861
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 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-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299
This theorem depends on definitions:  df-bi 117  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-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  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-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-top 14721  df-nei 14862
This theorem is referenced by: (None)
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