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Theorem elnei 14739
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 14738 . . 3  |-  ( ( J  e.  Top  /\  N  e.  ( ( nei `  J ) `  { P } ) )  ->  { P }  C_  N )
213adant2 1019 . 2  |-  ( ( J  e.  Top  /\  P  e.  A  /\  N  e.  ( ( nei `  J ) `  { P } ) )  ->  { P }  C_  N )
3 snssg 3778 . . 3  |-  ( P  e.  A  ->  ( P  e.  N  <->  { P }  C_  N ) )
433ad2ant2 1022 . 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 981    e. wcel 2178    C_ wss 3174   {csn 3643   ` cfv 5290   Topctop 14584   neicnei 14725
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2181  ax-ext 2189  ax-coll 4175  ax-sep 4178  ax-pow 4234  ax-pr 4269
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-reu 2493  df-rab 2495  df-v 2778  df-sbc 3006  df-csb 3102  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-iun 3943  df-br 4060  df-opab 4122  df-mpt 4123  df-id 4358  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-res 4705  df-ima 4706  df-iota 5251  df-fun 5292  df-fn 5293  df-f 5294  df-f1 5295  df-fo 5296  df-f1o 5297  df-fv 5298  df-top 14585  df-nei 14726
This theorem is referenced by: (None)
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