Metamath Proof Explorer < Previous   Next > Nearby theorems Mirrors  >  Home  >  MPE Home  >  Th. List  >  tgrest Structured version   Visualization version   GIF version

Theorem tgrest 21011
 Description: A subspace can be generated by restricted sets from a basis for the original topology. (Contributed by Mario Carneiro, 19-Mar-2015.) (Proof shortened by Mario Carneiro, 30-Aug-2015.)
Assertion
Ref Expression
tgrest ((𝐵𝑉𝐴𝑊) → (topGen‘(𝐵t 𝐴)) = ((topGen‘𝐵) ↾t 𝐴))

Proof of Theorem tgrest
Dummy variables 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ovex 6718 . . . . 5 (𝐵t 𝐴) ∈ V
2 eltg3 20814 . . . . 5 ((𝐵t 𝐴) ∈ V → (𝑥 ∈ (topGen‘(𝐵t 𝐴)) ↔ ∃𝑦(𝑦 ⊆ (𝐵t 𝐴) ∧ 𝑥 = 𝑦)))
31, 2ax-mp 5 . . . 4 (𝑥 ∈ (topGen‘(𝐵t 𝐴)) ↔ ∃𝑦(𝑦 ⊆ (𝐵t 𝐴) ∧ 𝑥 = 𝑦))
4 simpll 805 . . . . . . . . 9 (((𝐵𝑉𝐴𝑊) ∧ 𝑦 ⊆ (𝐵t 𝐴)) → 𝐵𝑉)
5 funmpt 5964 . . . . . . . . . 10 Fun (𝑥𝐵 ↦ (𝑥𝐴))
65a1i 11 . . . . . . . . 9 (((𝐵𝑉𝐴𝑊) ∧ 𝑦 ⊆ (𝐵t 𝐴)) → Fun (𝑥𝐵 ↦ (𝑥𝐴)))
7 restval 16134 . . . . . . . . . . . 12 ((𝐵𝑉𝐴𝑊) → (𝐵t 𝐴) = ran (𝑥𝐵 ↦ (𝑥𝐴)))
87sseq2d 3666 . . . . . . . . . . 11 ((𝐵𝑉𝐴𝑊) → (𝑦 ⊆ (𝐵t 𝐴) ↔ 𝑦 ⊆ ran (𝑥𝐵 ↦ (𝑥𝐴))))
98biimpa 500 . . . . . . . . . 10 (((𝐵𝑉𝐴𝑊) ∧ 𝑦 ⊆ (𝐵t 𝐴)) → 𝑦 ⊆ ran (𝑥𝐵 ↦ (𝑥𝐴)))
10 vex 3234 . . . . . . . . . . . . 13 𝑥 ∈ V
1110inex1 4832 . . . . . . . . . . . 12 (𝑥𝐴) ∈ V
1211rgenw 2953 . . . . . . . . . . 11 𝑥𝐵 (𝑥𝐴) ∈ V
13 eqid 2651 . . . . . . . . . . . 12 (𝑥𝐵 ↦ (𝑥𝐴)) = (𝑥𝐵 ↦ (𝑥𝐴))
1413fnmpt 6058 . . . . . . . . . . 11 (∀𝑥𝐵 (𝑥𝐴) ∈ V → (𝑥𝐵 ↦ (𝑥𝐴)) Fn 𝐵)
15 fnima 6048 . . . . . . . . . . 11 ((𝑥𝐵 ↦ (𝑥𝐴)) Fn 𝐵 → ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝐵) = ran (𝑥𝐵 ↦ (𝑥𝐴)))
1612, 14, 15mp2b 10 . . . . . . . . . 10 ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝐵) = ran (𝑥𝐵 ↦ (𝑥𝐴))
179, 16syl6sseqr 3685 . . . . . . . . 9 (((𝐵𝑉𝐴𝑊) ∧ 𝑦 ⊆ (𝐵t 𝐴)) → 𝑦 ⊆ ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝐵))
18 ssimaexg 6303 . . . . . . . . 9 ((𝐵𝑉 ∧ Fun (𝑥𝐵 ↦ (𝑥𝐴)) ∧ 𝑦 ⊆ ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝐵)) → ∃𝑧(𝑧𝐵𝑦 = ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧)))
194, 6, 17, 18syl3anc 1366 . . . . . . . 8 (((𝐵𝑉𝐴𝑊) ∧ 𝑦 ⊆ (𝐵t 𝐴)) → ∃𝑧(𝑧𝐵𝑦 = ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧)))
20 df-ima 5156 . . . . . . . . . . . . . . . . 17 ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) = ran ((𝑥𝐵 ↦ (𝑥𝐴)) ↾ 𝑧)
21 resmpt 5484 . . . . . . . . . . . . . . . . . . 19 (𝑧𝐵 → ((𝑥𝐵 ↦ (𝑥𝐴)) ↾ 𝑧) = (𝑥𝑧 ↦ (𝑥𝐴)))
2221adantl 481 . . . . . . . . . . . . . . . . . 18 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ((𝑥𝐵 ↦ (𝑥𝐴)) ↾ 𝑧) = (𝑥𝑧 ↦ (𝑥𝐴)))
2322rneqd 5385 . . . . . . . . . . . . . . . . 17 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ran ((𝑥𝐵 ↦ (𝑥𝐴)) ↾ 𝑧) = ran (𝑥𝑧 ↦ (𝑥𝐴)))
2420, 23syl5eq 2697 . . . . . . . . . . . . . . . 16 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) = ran (𝑥𝑧 ↦ (𝑥𝐴)))
2524unieqd 4478 . . . . . . . . . . . . . . 15 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) = ran (𝑥𝑧 ↦ (𝑥𝐴)))
2611dfiun3 5412 . . . . . . . . . . . . . . 15 𝑥𝑧 (𝑥𝐴) = ran (𝑥𝑧 ↦ (𝑥𝐴))
2725, 26syl6eqr 2703 . . . . . . . . . . . . . 14 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) = 𝑥𝑧 (𝑥𝐴))
28 iunin1 4617 . . . . . . . . . . . . . 14 𝑥𝑧 (𝑥𝐴) = ( 𝑥𝑧 𝑥𝐴)
2927, 28syl6eq 2701 . . . . . . . . . . . . 13 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) = ( 𝑥𝑧 𝑥𝐴))
30 fvex 6239 . . . . . . . . . . . . . . 15 (topGen‘𝐵) ∈ V
3130a1i 11 . . . . . . . . . . . . . 14 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → (topGen‘𝐵) ∈ V)
32 simpr 476 . . . . . . . . . . . . . . 15 ((𝐵𝑉𝐴𝑊) → 𝐴𝑊)
3332adantr 480 . . . . . . . . . . . . . 14 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → 𝐴𝑊)
34 uniiun 4605 . . . . . . . . . . . . . . . 16 𝑧 = 𝑥𝑧 𝑥
35 eltg3i 20813 . . . . . . . . . . . . . . . 16 ((𝐵𝑉𝑧𝐵) → 𝑧 ∈ (topGen‘𝐵))
3634, 35syl5eqelr 2735 . . . . . . . . . . . . . . 15 ((𝐵𝑉𝑧𝐵) → 𝑥𝑧 𝑥 ∈ (topGen‘𝐵))
3736adantlr 751 . . . . . . . . . . . . . 14 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → 𝑥𝑧 𝑥 ∈ (topGen‘𝐵))
38 elrestr 16136 . . . . . . . . . . . . . 14 (((topGen‘𝐵) ∈ V ∧ 𝐴𝑊 𝑥𝑧 𝑥 ∈ (topGen‘𝐵)) → ( 𝑥𝑧 𝑥𝐴) ∈ ((topGen‘𝐵) ↾t 𝐴))
3931, 33, 37, 38syl3anc 1366 . . . . . . . . . . . . 13 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ( 𝑥𝑧 𝑥𝐴) ∈ ((topGen‘𝐵) ↾t 𝐴))
4029, 39eqeltrd 2730 . . . . . . . . . . . 12 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) ∈ ((topGen‘𝐵) ↾t 𝐴))
41 unieq 4476 . . . . . . . . . . . . 13 (𝑦 = ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) → 𝑦 = ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧))
4241eleq1d 2715 . . . . . . . . . . . 12 (𝑦 = ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) → ( 𝑦 ∈ ((topGen‘𝐵) ↾t 𝐴) ↔ ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) ∈ ((topGen‘𝐵) ↾t 𝐴)))
4340, 42syl5ibrcom 237 . . . . . . . . . . 11 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → (𝑦 = ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧) → 𝑦 ∈ ((topGen‘𝐵) ↾t 𝐴)))
4443expimpd 628 . . . . . . . . . 10 ((𝐵𝑉𝐴𝑊) → ((𝑧𝐵𝑦 = ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧)) → 𝑦 ∈ ((topGen‘𝐵) ↾t 𝐴)))
4544exlimdv 1901 . . . . . . . . 9 ((𝐵𝑉𝐴𝑊) → (∃𝑧(𝑧𝐵𝑦 = ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧)) → 𝑦 ∈ ((topGen‘𝐵) ↾t 𝐴)))
4645adantr 480 . . . . . . . 8 (((𝐵𝑉𝐴𝑊) ∧ 𝑦 ⊆ (𝐵t 𝐴)) → (∃𝑧(𝑧𝐵𝑦 = ((𝑥𝐵 ↦ (𝑥𝐴)) “ 𝑧)) → 𝑦 ∈ ((topGen‘𝐵) ↾t 𝐴)))
4719, 46mpd 15 . . . . . . 7 (((𝐵𝑉𝐴𝑊) ∧ 𝑦 ⊆ (𝐵t 𝐴)) → 𝑦 ∈ ((topGen‘𝐵) ↾t 𝐴))
48 eleq1 2718 . . . . . . 7 (𝑥 = 𝑦 → (𝑥 ∈ ((topGen‘𝐵) ↾t 𝐴) ↔ 𝑦 ∈ ((topGen‘𝐵) ↾t 𝐴)))
4947, 48syl5ibrcom 237 . . . . . 6 (((𝐵𝑉𝐴𝑊) ∧ 𝑦 ⊆ (𝐵t 𝐴)) → (𝑥 = 𝑦𝑥 ∈ ((topGen‘𝐵) ↾t 𝐴)))
5049expimpd 628 . . . . 5 ((𝐵𝑉𝐴𝑊) → ((𝑦 ⊆ (𝐵t 𝐴) ∧ 𝑥 = 𝑦) → 𝑥 ∈ ((topGen‘𝐵) ↾t 𝐴)))
5150exlimdv 1901 . . . 4 ((𝐵𝑉𝐴𝑊) → (∃𝑦(𝑦 ⊆ (𝐵t 𝐴) ∧ 𝑥 = 𝑦) → 𝑥 ∈ ((topGen‘𝐵) ↾t 𝐴)))
523, 51syl5bi 232 . . 3 ((𝐵𝑉𝐴𝑊) → (𝑥 ∈ (topGen‘(𝐵t 𝐴)) → 𝑥 ∈ ((topGen‘𝐵) ↾t 𝐴)))
5352ssrdv 3642 . 2 ((𝐵𝑉𝐴𝑊) → (topGen‘(𝐵t 𝐴)) ⊆ ((topGen‘𝐵) ↾t 𝐴))
54 restval 16134 . . . 4 (((topGen‘𝐵) ∈ V ∧ 𝐴𝑊) → ((topGen‘𝐵) ↾t 𝐴) = ran (𝑤 ∈ (topGen‘𝐵) ↦ (𝑤𝐴)))
5530, 32, 54sylancr 696 . . 3 ((𝐵𝑉𝐴𝑊) → ((topGen‘𝐵) ↾t 𝐴) = ran (𝑤 ∈ (topGen‘𝐵) ↦ (𝑤𝐴)))
56 eltg3 20814 . . . . . . . 8 (𝐵𝑉 → (𝑤 ∈ (topGen‘𝐵) ↔ ∃𝑧(𝑧𝐵𝑤 = 𝑧)))
5756adantr 480 . . . . . . 7 ((𝐵𝑉𝐴𝑊) → (𝑤 ∈ (topGen‘𝐵) ↔ ∃𝑧(𝑧𝐵𝑤 = 𝑧)))
5834ineq1i 3843 . . . . . . . . . . . 12 ( 𝑧𝐴) = ( 𝑥𝑧 𝑥𝐴)
5958, 28eqtr4i 2676 . . . . . . . . . . 11 ( 𝑧𝐴) = 𝑥𝑧 (𝑥𝐴)
60 simplll 813 . . . . . . . . . . . . . . . 16 ((((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) ∧ 𝑥𝑧) → 𝐵𝑉)
61 simpllr 815 . . . . . . . . . . . . . . . 16 ((((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) ∧ 𝑥𝑧) → 𝐴𝑊)
62 simpr 476 . . . . . . . . . . . . . . . . 17 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → 𝑧𝐵)
6362sselda 3636 . . . . . . . . . . . . . . . 16 ((((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) ∧ 𝑥𝑧) → 𝑥𝐵)
64 elrestr 16136 . . . . . . . . . . . . . . . 16 ((𝐵𝑉𝐴𝑊𝑥𝐵) → (𝑥𝐴) ∈ (𝐵t 𝐴))
6560, 61, 63, 64syl3anc 1366 . . . . . . . . . . . . . . 15 ((((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) ∧ 𝑥𝑧) → (𝑥𝐴) ∈ (𝐵t 𝐴))
66 eqid 2651 . . . . . . . . . . . . . . 15 (𝑥𝑧 ↦ (𝑥𝐴)) = (𝑥𝑧 ↦ (𝑥𝐴))
6765, 66fmptd 6425 . . . . . . . . . . . . . 14 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → (𝑥𝑧 ↦ (𝑥𝐴)):𝑧⟶(𝐵t 𝐴))
68 frn 6091 . . . . . . . . . . . . . 14 ((𝑥𝑧 ↦ (𝑥𝐴)):𝑧⟶(𝐵t 𝐴) → ran (𝑥𝑧 ↦ (𝑥𝐴)) ⊆ (𝐵t 𝐴))
6967, 68syl 17 . . . . . . . . . . . . 13 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ran (𝑥𝑧 ↦ (𝑥𝐴)) ⊆ (𝐵t 𝐴))
70 eltg3i 20813 . . . . . . . . . . . . 13 (((𝐵t 𝐴) ∈ V ∧ ran (𝑥𝑧 ↦ (𝑥𝐴)) ⊆ (𝐵t 𝐴)) → ran (𝑥𝑧 ↦ (𝑥𝐴)) ∈ (topGen‘(𝐵t 𝐴)))
711, 69, 70sylancr 696 . . . . . . . . . . . 12 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ran (𝑥𝑧 ↦ (𝑥𝐴)) ∈ (topGen‘(𝐵t 𝐴)))
7226, 71syl5eqel 2734 . . . . . . . . . . 11 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → 𝑥𝑧 (𝑥𝐴) ∈ (topGen‘(𝐵t 𝐴)))
7359, 72syl5eqel 2734 . . . . . . . . . 10 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → ( 𝑧𝐴) ∈ (topGen‘(𝐵t 𝐴)))
74 ineq1 3840 . . . . . . . . . . 11 (𝑤 = 𝑧 → (𝑤𝐴) = ( 𝑧𝐴))
7574eleq1d 2715 . . . . . . . . . 10 (𝑤 = 𝑧 → ((𝑤𝐴) ∈ (topGen‘(𝐵t 𝐴)) ↔ ( 𝑧𝐴) ∈ (topGen‘(𝐵t 𝐴))))
7673, 75syl5ibrcom 237 . . . . . . . . 9 (((𝐵𝑉𝐴𝑊) ∧ 𝑧𝐵) → (𝑤 = 𝑧 → (𝑤𝐴) ∈ (topGen‘(𝐵t 𝐴))))
7776expimpd 628 . . . . . . . 8 ((𝐵𝑉𝐴𝑊) → ((𝑧𝐵𝑤 = 𝑧) → (𝑤𝐴) ∈ (topGen‘(𝐵t 𝐴))))
7877exlimdv 1901 . . . . . . 7 ((𝐵𝑉𝐴𝑊) → (∃𝑧(𝑧𝐵𝑤 = 𝑧) → (𝑤𝐴) ∈ (topGen‘(𝐵t 𝐴))))
7957, 78sylbid 230 . . . . . 6 ((𝐵𝑉𝐴𝑊) → (𝑤 ∈ (topGen‘𝐵) → (𝑤𝐴) ∈ (topGen‘(𝐵t 𝐴))))
8079imp 444 . . . . 5 (((𝐵𝑉𝐴𝑊) ∧ 𝑤 ∈ (topGen‘𝐵)) → (𝑤𝐴) ∈ (topGen‘(𝐵t 𝐴)))
81 eqid 2651 . . . . 5 (𝑤 ∈ (topGen‘𝐵) ↦ (𝑤𝐴)) = (𝑤 ∈ (topGen‘𝐵) ↦ (𝑤𝐴))
8280, 81fmptd 6425 . . . 4 ((𝐵𝑉𝐴𝑊) → (𝑤 ∈ (topGen‘𝐵) ↦ (𝑤𝐴)):(topGen‘𝐵)⟶(topGen‘(𝐵t 𝐴)))
83 frn 6091 . . . 4 ((𝑤 ∈ (topGen‘𝐵) ↦ (𝑤𝐴)):(topGen‘𝐵)⟶(topGen‘(𝐵t 𝐴)) → ran (𝑤 ∈ (topGen‘𝐵) ↦ (𝑤𝐴)) ⊆ (topGen‘(𝐵t 𝐴)))
8482, 83syl 17 . . 3 ((𝐵𝑉𝐴𝑊) → ran (𝑤 ∈ (topGen‘𝐵) ↦ (𝑤𝐴)) ⊆ (topGen‘(𝐵t 𝐴)))
8555, 84eqsstrd 3672 . 2 ((𝐵𝑉𝐴𝑊) → ((topGen‘𝐵) ↾t 𝐴) ⊆ (topGen‘(𝐵t 𝐴)))
8653, 85eqssd 3653 1 ((𝐵𝑉𝐴𝑊) → (topGen‘(𝐵t 𝐴)) = ((topGen‘𝐵) ↾t 𝐴))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 383   = wceq 1523  ∃wex 1744   ∈ wcel 2030  ∀wral 2941  Vcvv 3231   ∩ cin 3606   ⊆ wss 3607  ∪ cuni 4468  ∪ ciun 4552   ↦ cmpt 4762  ran crn 5144   ↾ cres 5145   “ cima 5146  Fun wfun 5920   Fn wfn 5921  ⟶wf 5922  ‘cfv 5926  (class class class)co 6690   ↾t crest 16128  topGenctg 16145 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-rest 16130  df-topgen 16151 This theorem is referenced by:  resttop  21012  ordtrest2  21056  2ndcrest  21305  txrest  21482  xkoptsub  21505  xrtgioo  22656  ordtrest2NEW  30097  ptrest  33538
 Copyright terms: Public domain W3C validator