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Theorem unitgt 7565
Description: The topology generated by a basis B is a topology on U.B. Importantly, this theorem means that we don't have to specify separately the base set for the topological space generated by a basis. In other words, any member of the class Bases completely specifies the basis it corresponds to.
Assertion
Ref Expression
unitgt |- (B e. Bases -> U.(topGen` B) = U.B)

Proof of Theorem unitgt
StepHypRef Expression
1 eltgt 7560 . . . . . 6 |- (B e. Bases -> (y e. (topGen` B) <-> y (_ U.(B i^i P~y)))
2 inss1 2220 . . . . . . . . 9 |- (B i^i P~y) (_ B
3 uniss 2511 . . . . . . . . 9 |- ((B i^i P~y) (_ B -> U.(B i^i P~y) (_ U.B)
42, 3ax-mp 7 . . . . . . . 8 |- U.(B i^i P~y) (_ U.B
5 sstr 2062 . . . . . . . 8 |- ((y (_ U.(B i^i P~y) /\ U.(B i^i P~y) (_ U.B) -> y (_ U.B)
64, 5mpan2 694 . . . . . . 7 |- (y (_ U.(B i^i P~y) -> y (_ U.B)
76sseld 2057 . . . . . 6 |- (y (_ U.(B i^i P~y) -> (x e. y -> x e. U.B))
81, 7syl6bi 214 . . . . 5 |- (B e. Bases -> (y e. (topGen` B) -> (x e. y -> x e. U.B)))
98r19.23adv 1738 . . . 4 |- (B e. Bases -> (E.y e. (topGen` B)x e. y -> x e. U.B))
10 eluni2 2497 . . . 4 |- (x e. U.(topGen` B) <-> E.y e. (topGen` B)x e. y)
119, 10syl5ib 206 . . 3 |- (B e. Bases -> (x e. U.(topGen` B) -> x e. U.B))
12 bastgt 7564 . . . . 5 |- (B e. Bases -> B (_ (topGen` B))
13 uniss 2511 . . . . 5 |- (B (_ (topGen` B) -> U.B (_ U.(topGen` B))
1412, 13syl 10 . . . 4 |- (B e. Bases -> U.B (_ U.(topGen` B))
1514sseld 2057 . . 3 |- (B e. Bases -> (x e. U.B -> x e. U.(topGen` B)))
1611, 15impbid 514 . 2 |- (B e. Bases -> (x e. U.(topGen` B) <-> x e. U.B))
1716eqrdv 1466 1 |- (B e. Bases -> U.(topGen` B) = U.B)
Colors of variables: wff set class
Syntax hints:   -> wi 3   = wceq 953   e. wcel 955  E.wrex 1638   i^i cin 2036   (_ wss 2037  P~cpw 2391  U.cuni 2493  ` cfv 3172  Basesctb 7532  topGenctg 7533
This theorem is referenced by:  tgclt 7566  uniretop 7599
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 959  ax-gen 960  ax-8 961  ax-9 962  ax-10 963  ax-11 964  ax-12 965  ax-13 966  ax-14 967  ax-17 968  ax-4 970  ax-5o 972  ax-6o 975  ax-9o 1119  ax-10o 1136  ax-16 1206  ax-11o 1213  ax-ext 1452  ax-sep 2693  ax-pow 2732  ax-pr 2769  ax-un 2857
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-3an 775  df-ex 978  df-sb 1168  df-eu 1375  df-mo 1376  df-clab 1457  df-cleq 1462  df-clel 1465  df-ne 1579  df-ral 1641  df-rex 1642  df-rab 1644  df-v 1803  df-dif 2039  df-un 2040  df-in 2041  df-ss 2043  df-nul 2271  df-pw 2392  df-sn 2402  df-pr 2403  df-op 2406  df-uni 2494  df-br 2610  df-opab 2657  df-id 2824  df-xp 3174  df-rel 3175  df-cnv 3176  df-co 3177  df-dm 3178  df-rn 3179  df-res 3180  df-ima 3181  df-fun 3182  df-fv 3188  df-bases 7536  df-topgen 7537
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