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Theorem neiptopreu 19927
Description: If, to each element  P of a set  X, we associate a set  ( N `  P ) fulfilling the properties Vi, Vii, Viii and property Viv of [BourbakiTop1] p. I.2. , corresponding to ssnei 19904, innei 19919, elnei 19905 and neissex 19921, then there is a unique topology  j such that for any point  p,  ( N `  p ) is the set of neighborhoods of  p. Proposition 2 of [BourbakiTop1] p. I.3. This can be used to build a topology from a set of neighborhoods. Note that the additional condition that  X is a neighborhood of all points was added. (Contributed by Thierry Arnoux, 6-Jan-2018.)
Hypotheses
Ref Expression
neiptop.o  |-  J  =  { a  e.  ~P X  |  A. p  e.  a  a  e.  ( N `  p ) }
neiptop.0  |-  ( ph  ->  N : X --> ~P ~P X )
neiptop.1  |-  ( ( ( ( ph  /\  p  e.  X )  /\  a  C_  b  /\  b  C_  X )  /\  a  e.  ( N `  p ) )  -> 
b  e.  ( N `
 p ) )
neiptop.2  |-  ( (
ph  /\  p  e.  X )  ->  ( fi `  ( N `  p ) )  C_  ( N `  p ) )
neiptop.3  |-  ( ( ( ph  /\  p  e.  X )  /\  a  e.  ( N `  p
) )  ->  p  e.  a )
neiptop.4  |-  ( ( ( ph  /\  p  e.  X )  /\  a  e.  ( N `  p
) )  ->  E. b  e.  ( N `  p
) A. q  e.  b  a  e.  ( N `  q ) )
neiptop.5  |-  ( (
ph  /\  p  e.  X )  ->  X  e.  ( N `  p
) )
Assertion
Ref Expression
neiptopreu  |-  ( ph  ->  E! j  e.  (TopOn `  X ) N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )
Distinct variable groups:    p, a, N    X, a, b, p    J, a, p    X, p    ph, p    N, b    X, b    ph, a, b, q, p    N, p, q    X, q    ph, q    j, a, b, J, p    j,
q, N    j, X    ph, j
Allowed substitution hint:    J( q)

Proof of Theorem neiptopreu
StepHypRef Expression
1 neiptop.o . . . . 5  |-  J  =  { a  e.  ~P X  |  A. p  e.  a  a  e.  ( N `  p ) }
2 neiptop.0 . . . . 5  |-  ( ph  ->  N : X --> ~P ~P X )
3 neiptop.1 . . . . 5  |-  ( ( ( ( ph  /\  p  e.  X )  /\  a  C_  b  /\  b  C_  X )  /\  a  e.  ( N `  p ) )  -> 
b  e.  ( N `
 p ) )
4 neiptop.2 . . . . 5  |-  ( (
ph  /\  p  e.  X )  ->  ( fi `  ( N `  p ) )  C_  ( N `  p ) )
5 neiptop.3 . . . . 5  |-  ( ( ( ph  /\  p  e.  X )  /\  a  e.  ( N `  p
) )  ->  p  e.  a )
6 neiptop.4 . . . . 5  |-  ( ( ( ph  /\  p  e.  X )  /\  a  e.  ( N `  p
) )  ->  E. b  e.  ( N `  p
) A. q  e.  b  a  e.  ( N `  q ) )
7 neiptop.5 . . . . 5  |-  ( (
ph  /\  p  e.  X )  ->  X  e.  ( N `  p
) )
81, 2, 3, 4, 5, 6, 7neiptoptop 19925 . . . 4  |-  ( ph  ->  J  e.  Top )
9 eqid 2402 . . . . 5  |-  U. J  =  U. J
109toptopon 19726 . . . 4  |-  ( J  e.  Top  <->  J  e.  (TopOn `  U. J ) )
118, 10sylib 196 . . 3  |-  ( ph  ->  J  e.  (TopOn `  U. J ) )
121, 2, 3, 4, 5, 6, 7neiptopuni 19924 . . . 4  |-  ( ph  ->  X  =  U. J
)
1312fveq2d 5853 . . 3  |-  ( ph  ->  (TopOn `  X )  =  (TopOn `  U. J ) )
1411, 13eleqtrrd 2493 . 2  |-  ( ph  ->  J  e.  (TopOn `  X ) )
151, 2, 3, 4, 5, 6, 7neiptopnei 19926 . 2  |-  ( ph  ->  N  =  ( p  e.  X  |->  ( ( nei `  J ) `
 { p }
) ) )
16 nfv 1728 . . . . . . . . . 10  |-  F/ p
( ph  /\  j  e.  (TopOn `  X )
)
17 nfmpt1 4484 . . . . . . . . . . 11  |-  F/_ p
( p  e.  X  |->  ( ( nei `  j
) `  { p } ) )
1817nfeq2 2581 . . . . . . . . . 10  |-  F/ p  N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) )
1916, 18nfan 1956 . . . . . . . . 9  |-  F/ p
( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )
20 nfv 1728 . . . . . . . . 9  |-  F/ p  b  C_  X
2119, 20nfan 1956 . . . . . . . 8  |-  F/ p
( ( ( ph  /\  j  e.  (TopOn `  X ) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) ) )  /\  b  C_  X )
22 simpllr 761 . . . . . . . . . . 11  |-  ( ( ( ( ( ph  /\  j  e.  (TopOn `  X ) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) ) )  /\  b  C_  X )  /\  p  e.  b )  ->  N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) ) )
23 simpr 459 . . . . . . . . . . . 12  |-  ( ( ( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )  /\  b  C_  X )  ->  b  C_  X )
2423sselda 3442 . . . . . . . . . . 11  |-  ( ( ( ( ( ph  /\  j  e.  (TopOn `  X ) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) ) )  /\  b  C_  X )  /\  p  e.  b )  ->  p  e.  X )
25 id 22 . . . . . . . . . . . 12  |-  ( N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) )  ->  N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )
26 fvex 5859 . . . . . . . . . . . . 13  |-  ( ( nei `  j ) `
 { p }
)  e.  _V
2726a1i 11 . . . . . . . . . . . 12  |-  ( ( N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) )  /\  p  e.  X )  ->  (
( nei `  j
) `  { p } )  e.  _V )
2825, 27fvmpt2d 5943 . . . . . . . . . . 11  |-  ( ( N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) )  /\  p  e.  X )  ->  ( N `  p )  =  ( ( nei `  j ) `  {
p } ) )
2922, 24, 28syl2anc 659 . . . . . . . . . 10  |-  ( ( ( ( ( ph  /\  j  e.  (TopOn `  X ) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) ) )  /\  b  C_  X )  /\  p  e.  b )  ->  ( N `  p
)  =  ( ( nei `  j ) `
 { p }
) )
3029eqcomd 2410 . . . . . . . . 9  |-  ( ( ( ( ( ph  /\  j  e.  (TopOn `  X ) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) ) )  /\  b  C_  X )  /\  p  e.  b )  ->  ( ( nei `  j
) `  { p } )  =  ( N `  p ) )
3130eleq2d 2472 . . . . . . . 8  |-  ( ( ( ( ( ph  /\  j  e.  (TopOn `  X ) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) ) )  /\  b  C_  X )  /\  p  e.  b )  ->  ( b  e.  ( ( nei `  j
) `  { p } )  <->  b  e.  ( N `  p ) ) )
3221, 31ralbida 2837 . . . . . . 7  |-  ( ( ( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )  /\  b  C_  X )  ->  ( A. p  e.  b 
b  e.  ( ( nei `  j ) `
 { p }
)  <->  A. p  e.  b  b  e.  ( N `
 p ) ) )
3332pm5.32da 639 . . . . . 6  |-  ( ( ( ph  /\  j  e.  (TopOn `  X )
)  /\  N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )  ->  ( ( b 
C_  X  /\  A. p  e.  b  b  e.  ( ( nei `  j
) `  { p } ) )  <->  ( b  C_  X  /\  A. p  e.  b  b  e.  ( N `  p ) ) ) )
34 simpllr 761 . . . . . . . . 9  |-  ( ( ( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )  /\  b  e.  j )  ->  j  e.  (TopOn `  X )
)
35 simpr 459 . . . . . . . . 9  |-  ( ( ( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )  /\  b  e.  j )  ->  b  e.  j )
36 toponss 19722 . . . . . . . . 9  |-  ( ( j  e.  (TopOn `  X )  /\  b  e.  j )  ->  b  C_  X )
3734, 35, 36syl2anc 659 . . . . . . . 8  |-  ( ( ( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )  /\  b  e.  j )  ->  b  C_  X )
38 topontop 19719 . . . . . . . . . . 11  |-  ( j  e.  (TopOn `  X
)  ->  j  e.  Top )
3938ad2antlr 725 . . . . . . . . . 10  |-  ( ( ( ph  /\  j  e.  (TopOn `  X )
)  /\  N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )  ->  j  e.  Top )
40 opnnei 19914 . . . . . . . . . 10  |-  ( j  e.  Top  ->  (
b  e.  j  <->  A. p  e.  b  b  e.  ( ( nei `  j
) `  { p } ) ) )
4139, 40syl 17 . . . . . . . . 9  |-  ( ( ( ph  /\  j  e.  (TopOn `  X )
)  /\  N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )  ->  ( b  e.  j  <->  A. p  e.  b  b  e.  ( ( nei `  j ) `
 { p }
) ) )
4241biimpa 482 . . . . . . . 8  |-  ( ( ( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )  /\  b  e.  j )  ->  A. p  e.  b  b  e.  ( ( nei `  j
) `  { p } ) )
4337, 42jca 530 . . . . . . 7  |-  ( ( ( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )  /\  b  e.  j )  ->  (
b  C_  X  /\  A. p  e.  b  b  e.  ( ( nei `  j ) `  {
p } ) ) )
4441biimpar 483 . . . . . . . 8  |-  ( ( ( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )  /\  A. p  e.  b  b  e.  ( ( nei `  j
) `  { p } ) )  -> 
b  e.  j )
4544adantrl 714 . . . . . . 7  |-  ( ( ( ( ph  /\  j  e.  (TopOn `  X
) )  /\  N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) ) )  /\  ( b 
C_  X  /\  A. p  e.  b  b  e.  ( ( nei `  j
) `  { p } ) ) )  ->  b  e.  j )
4643, 45impbida 833 . . . . . 6  |-  ( ( ( ph  /\  j  e.  (TopOn `  X )
)  /\  N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )  ->  ( b  e.  j  <->  ( b  C_  X  /\  A. p  e.  b  b  e.  ( ( nei `  j
) `  { p } ) ) ) )
471neipeltop 19923 . . . . . . 7  |-  ( b  e.  J  <->  ( b  C_  X  /\  A. p  e.  b  b  e.  ( N `  p ) ) )
4847a1i 11 . . . . . 6  |-  ( ( ( ph  /\  j  e.  (TopOn `  X )
)  /\  N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )  ->  ( b  e.  J  <->  ( b  C_  X  /\  A. p  e.  b  b  e.  ( N `  p ) ) ) )
4933, 46, 483bitr4d 285 . . . . 5  |-  ( ( ( ph  /\  j  e.  (TopOn `  X )
)  /\  N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )  ->  ( b  e.  j  <->  b  e.  J
) )
5049eqrdv 2399 . . . 4  |-  ( ( ( ph  /\  j  e.  (TopOn `  X )
)  /\  N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )  ->  j  =  J )
5150ex 432 . . 3  |-  ( (
ph  /\  j  e.  (TopOn `  X ) )  ->  ( N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) )  -> 
j  =  J ) )
5251ralrimiva 2818 . 2  |-  ( ph  ->  A. j  e.  (TopOn `  X ) ( N  =  ( p  e.  X  |->  ( ( nei `  j ) `  {
p } ) )  ->  j  =  J ) )
53 simpl 455 . . . . . . 7  |-  ( ( j  =  J  /\  p  e.  X )  ->  j  =  J )
5453fveq2d 5853 . . . . . 6  |-  ( ( j  =  J  /\  p  e.  X )  ->  ( nei `  j
)  =  ( nei `  J ) )
5554fveq1d 5851 . . . . 5  |-  ( ( j  =  J  /\  p  e.  X )  ->  ( ( nei `  j
) `  { p } )  =  ( ( nei `  J
) `  { p } ) )
5655mpteq2dva 4481 . . . 4  |-  ( j  =  J  ->  (
p  e.  X  |->  ( ( nei `  j
) `  { p } ) )  =  ( p  e.  X  |->  ( ( nei `  J
) `  { p } ) ) )
5756eqeq2d 2416 . . 3  |-  ( j  =  J  ->  ( N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) )  <->  N  =  ( p  e.  X  |->  ( ( nei `  J
) `  { p } ) ) ) )
5857eqreu 3241 . 2  |-  ( ( J  e.  (TopOn `  X )  /\  N  =  ( p  e.  X  |->  ( ( nei `  J ) `  {
p } ) )  /\  A. j  e.  (TopOn `  X )
( N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) )  -> 
j  =  J ) )  ->  E! j  e.  (TopOn `  X ) N  =  ( p  e.  X  |->  ( ( nei `  j ) `
 { p }
) ) )
5914, 15, 52, 58syl3anc 1230 1  |-  ( ph  ->  E! j  e.  (TopOn `  X ) N  =  ( p  e.  X  |->  ( ( nei `  j
) `  { p } ) ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 184    /\ wa 367    /\ w3a 974    = wceq 1405    e. wcel 1842   A.wral 2754   E.wrex 2755   E!wreu 2756   {crab 2758   _Vcvv 3059    C_ wss 3414   ~Pcpw 3955   {csn 3972   U.cuni 4191    |-> cmpt 4453   -->wf 5565   ` cfv 5569   ficfi 7904   Topctop 19686  TopOnctopon 19687   neicnei 19891
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1639  ax-4 1652  ax-5 1725  ax-6 1771  ax-7 1814  ax-8 1844  ax-9 1846  ax-10 1861  ax-11 1866  ax-12 1878  ax-13 2026  ax-ext 2380  ax-rep 4507  ax-sep 4517  ax-nul 4525  ax-pow 4572  ax-pr 4630  ax-un 6574
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3or 975  df-3an 976  df-tru 1408  df-ex 1634  df-nf 1638  df-sb 1764  df-eu 2242  df-mo 2243  df-clab 2388  df-cleq 2394  df-clel 2397  df-nfc 2552  df-ne 2600  df-ral 2759  df-rex 2760  df-reu 2761  df-rab 2763  df-v 3061  df-sbc 3278  df-csb 3374  df-dif 3417  df-un 3419  df-in 3421  df-ss 3428  df-pss 3430  df-nul 3739  df-if 3886  df-pw 3957  df-sn 3973  df-pr 3975  df-tp 3977  df-op 3979  df-uni 4192  df-int 4228  df-iun 4273  df-br 4396  df-opab 4454  df-mpt 4455  df-tr 4490  df-eprel 4734  df-id 4738  df-po 4744  df-so 4745  df-fr 4782  df-we 4784  df-xp 4829  df-rel 4830  df-cnv 4831  df-co 4832  df-dm 4833  df-rn 4834  df-res 4835  df-ima 4836  df-pred 5367  df-ord 5413  df-on 5414  df-lim 5415  df-suc 5416  df-iota 5533  df-fun 5571  df-fn 5572  df-f 5573  df-f1 5574  df-fo 5575  df-f1o 5576  df-fv 5577  df-ov 6281  df-oprab 6282  df-mpt2 6283  df-om 6684  df-wrecs 7013  df-recs 7075  df-rdg 7113  df-1o 7167  df-oadd 7171  df-er 7348  df-en 7555  df-fin 7558  df-fi 7905  df-top 19691  df-topon 19694  df-ntr 19813  df-nei 19892
This theorem is referenced by:  ustuqtop  21041
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