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Theorem cnrest2 22037
Description: Equivalence of continuity in the parent topology and continuity in a subspace. (Contributed by Jeff Hankins, 10-Jul-2009.) (Proof shortened by Mario Carneiro, 21-Aug-2015.)
Assertion
Ref Expression
cnrest2 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))))

Proof of Theorem cnrest2
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 cntop1 21991 . . . 4 (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐽 ∈ Top)
21a1i 11 . . 3 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐽 ∈ Top))
3 eqid 2738 . . . . . . . 8 𝐽 = 𝐽
4 eqid 2738 . . . . . . . 8 𝐾 = 𝐾
53, 4cnf 21997 . . . . . . 7 (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹: 𝐽 𝐾)
65ffnd 6505 . . . . . 6 (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹 Fn 𝐽)
76a1i 11 . . . . 5 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹 Fn 𝐽))
8 simp2 1138 . . . . 5 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → ran 𝐹𝐵)
97, 8jctird 530 . . . 4 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → (𝐹 ∈ (𝐽 Cn 𝐾) → (𝐹 Fn 𝐽 ∧ ran 𝐹𝐵)))
10 df-f 6343 . . . 4 (𝐹: 𝐽𝐵 ↔ (𝐹 Fn 𝐽 ∧ ran 𝐹𝐵))
119, 10syl6ibr 255 . . 3 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹: 𝐽𝐵))
122, 11jcad 516 . 2 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → (𝐹 ∈ (𝐽 Cn 𝐾) → (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)))
13 cntop1 21991 . . . . 5 (𝐹 ∈ (𝐽 Cn (𝐾t 𝐵)) → 𝐽 ∈ Top)
1413adantl 485 . . . 4 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))) → 𝐽 ∈ Top)
15 toptopon2 21669 . . . . . 6 (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘ 𝐽))
1614, 15sylib 221 . . . . 5 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))) → 𝐽 ∈ (TopOn‘ 𝐽))
17 resttopon 21912 . . . . . . 7 ((𝐾 ∈ (TopOn‘𝑌) ∧ 𝐵𝑌) → (𝐾t 𝐵) ∈ (TopOn‘𝐵))
18173adant2 1132 . . . . . 6 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → (𝐾t 𝐵) ∈ (TopOn‘𝐵))
1918adantr 484 . . . . 5 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))) → (𝐾t 𝐵) ∈ (TopOn‘𝐵))
20 simpr 488 . . . . 5 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))) → 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵)))
21 cnf2 22000 . . . . 5 ((𝐽 ∈ (TopOn‘ 𝐽) ∧ (𝐾t 𝐵) ∈ (TopOn‘𝐵) ∧ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))) → 𝐹: 𝐽𝐵)
2216, 19, 20, 21syl3anc 1372 . . . 4 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))) → 𝐹: 𝐽𝐵)
2314, 22jca 515 . . 3 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))) → (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵))
2423ex 416 . 2 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → (𝐹 ∈ (𝐽 Cn (𝐾t 𝐵)) → (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)))
25 vex 3402 . . . . . . . . 9 𝑥 ∈ V
2625inex1 5185 . . . . . . . 8 (𝑥𝐵) ∈ V
2726a1i 11 . . . . . . 7 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑥𝐾) → (𝑥𝐵) ∈ V)
28 simpl1 1192 . . . . . . . 8 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → 𝐾 ∈ (TopOn‘𝑌))
29 toponmax 21677 . . . . . . . . . 10 (𝐾 ∈ (TopOn‘𝑌) → 𝑌𝐾)
3028, 29syl 17 . . . . . . . . 9 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → 𝑌𝐾)
31 simpl3 1194 . . . . . . . . 9 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → 𝐵𝑌)
3230, 31ssexd 5192 . . . . . . . 8 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → 𝐵 ∈ V)
33 elrest 16804 . . . . . . . 8 ((𝐾 ∈ (TopOn‘𝑌) ∧ 𝐵 ∈ V) → (𝑦 ∈ (𝐾t 𝐵) ↔ ∃𝑥𝐾 𝑦 = (𝑥𝐵)))
3428, 32, 33syl2anc 587 . . . . . . 7 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → (𝑦 ∈ (𝐾t 𝐵) ↔ ∃𝑥𝐾 𝑦 = (𝑥𝐵)))
35 imaeq2 5899 . . . . . . . . 9 (𝑦 = (𝑥𝐵) → (𝐹𝑦) = (𝐹 “ (𝑥𝐵)))
3635eleq1d 2817 . . . . . . . 8 (𝑦 = (𝑥𝐵) → ((𝐹𝑦) ∈ 𝐽 ↔ (𝐹 “ (𝑥𝐵)) ∈ 𝐽))
3736adantl 485 . . . . . . 7 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑦 = (𝑥𝐵)) → ((𝐹𝑦) ∈ 𝐽 ↔ (𝐹 “ (𝑥𝐵)) ∈ 𝐽))
3827, 34, 37ralxfr2d 5277 . . . . . 6 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → (∀𝑦 ∈ (𝐾t 𝐵)(𝐹𝑦) ∈ 𝐽 ↔ ∀𝑥𝐾 (𝐹 “ (𝑥𝐵)) ∈ 𝐽))
39 simplrr 778 . . . . . . . . . 10 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑥𝐾) → 𝐹: 𝐽𝐵)
40 ffun 6507 . . . . . . . . . 10 (𝐹: 𝐽𝐵 → Fun 𝐹)
41 inpreima 6841 . . . . . . . . . 10 (Fun 𝐹 → (𝐹 “ (𝑥𝐵)) = ((𝐹𝑥) ∩ (𝐹𝐵)))
4239, 40, 413syl 18 . . . . . . . . 9 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑥𝐾) → (𝐹 “ (𝑥𝐵)) = ((𝐹𝑥) ∩ (𝐹𝐵)))
43 cnvimass 5923 . . . . . . . . . . . 12 (𝐹𝑥) ⊆ dom 𝐹
44 cnvimarndm 5924 . . . . . . . . . . . 12 (𝐹 “ ran 𝐹) = dom 𝐹
4543, 44sseqtrri 3914 . . . . . . . . . . 11 (𝐹𝑥) ⊆ (𝐹 “ ran 𝐹)
46 simpll2 1214 . . . . . . . . . . . 12 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑥𝐾) → ran 𝐹𝐵)
47 imass2 5939 . . . . . . . . . . . 12 (ran 𝐹𝐵 → (𝐹 “ ran 𝐹) ⊆ (𝐹𝐵))
4846, 47syl 17 . . . . . . . . . . 11 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑥𝐾) → (𝐹 “ ran 𝐹) ⊆ (𝐹𝐵))
4945, 48sstrid 3888 . . . . . . . . . 10 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑥𝐾) → (𝐹𝑥) ⊆ (𝐹𝐵))
50 df-ss 3860 . . . . . . . . . 10 ((𝐹𝑥) ⊆ (𝐹𝐵) ↔ ((𝐹𝑥) ∩ (𝐹𝐵)) = (𝐹𝑥))
5149, 50sylib 221 . . . . . . . . 9 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑥𝐾) → ((𝐹𝑥) ∩ (𝐹𝐵)) = (𝐹𝑥))
5242, 51eqtrd 2773 . . . . . . . 8 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑥𝐾) → (𝐹 “ (𝑥𝐵)) = (𝐹𝑥))
5352eleq1d 2817 . . . . . . 7 ((((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) ∧ 𝑥𝐾) → ((𝐹 “ (𝑥𝐵)) ∈ 𝐽 ↔ (𝐹𝑥) ∈ 𝐽))
5453ralbidva 3108 . . . . . 6 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → (∀𝑥𝐾 (𝐹 “ (𝑥𝐵)) ∈ 𝐽 ↔ ∀𝑥𝐾 (𝐹𝑥) ∈ 𝐽))
55 simprr 773 . . . . . . . 8 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → 𝐹: 𝐽𝐵)
5655, 31fssd 6522 . . . . . . 7 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → 𝐹: 𝐽𝑌)
5756biantrurd 536 . . . . . 6 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → (∀𝑥𝐾 (𝐹𝑥) ∈ 𝐽 ↔ (𝐹: 𝐽𝑌 ∧ ∀𝑥𝐾 (𝐹𝑥) ∈ 𝐽)))
5838, 54, 573bitrrd 309 . . . . 5 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → ((𝐹: 𝐽𝑌 ∧ ∀𝑥𝐾 (𝐹𝑥) ∈ 𝐽) ↔ ∀𝑦 ∈ (𝐾t 𝐵)(𝐹𝑦) ∈ 𝐽))
5955biantrurd 536 . . . . 5 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → (∀𝑦 ∈ (𝐾t 𝐵)(𝐹𝑦) ∈ 𝐽 ↔ (𝐹: 𝐽𝐵 ∧ ∀𝑦 ∈ (𝐾t 𝐵)(𝐹𝑦) ∈ 𝐽)))
6058, 59bitrd 282 . . . 4 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → ((𝐹: 𝐽𝑌 ∧ ∀𝑥𝐾 (𝐹𝑥) ∈ 𝐽) ↔ (𝐹: 𝐽𝐵 ∧ ∀𝑦 ∈ (𝐾t 𝐵)(𝐹𝑦) ∈ 𝐽)))
61 simprl 771 . . . . . 6 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → 𝐽 ∈ Top)
6261, 15sylib 221 . . . . 5 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → 𝐽 ∈ (TopOn‘ 𝐽))
63 iscn 21986 . . . . 5 ((𝐽 ∈ (TopOn‘ 𝐽) ∧ 𝐾 ∈ (TopOn‘𝑌)) → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹: 𝐽𝑌 ∧ ∀𝑥𝐾 (𝐹𝑥) ∈ 𝐽)))
6462, 28, 63syl2anc 587 . . . 4 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹: 𝐽𝑌 ∧ ∀𝑥𝐾 (𝐹𝑥) ∈ 𝐽)))
6518adantr 484 . . . . 5 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → (𝐾t 𝐵) ∈ (TopOn‘𝐵))
66 iscn 21986 . . . . 5 ((𝐽 ∈ (TopOn‘ 𝐽) ∧ (𝐾t 𝐵) ∈ (TopOn‘𝐵)) → (𝐹 ∈ (𝐽 Cn (𝐾t 𝐵)) ↔ (𝐹: 𝐽𝐵 ∧ ∀𝑦 ∈ (𝐾t 𝐵)(𝐹𝑦) ∈ 𝐽)))
6762, 65, 66syl2anc 587 . . . 4 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → (𝐹 ∈ (𝐽 Cn (𝐾t 𝐵)) ↔ (𝐹: 𝐽𝐵 ∧ ∀𝑦 ∈ (𝐾t 𝐵)(𝐹𝑦) ∈ 𝐽)))
6860, 64, 673bitr4d 314 . . 3 (((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) ∧ (𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵)) → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))))
6968ex 416 . 2 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → ((𝐽 ∈ Top ∧ 𝐹: 𝐽𝐵) → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵)))))
7012, 24, 69pm5.21ndd 384 1 ((𝐾 ∈ (TopOn‘𝑌) ∧ ran 𝐹𝐵𝐵𝑌) → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ 𝐹 ∈ (𝐽 Cn (𝐾t 𝐵))))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  wa 399  w3a 1088   = wceq 1542  wcel 2114  wral 3053  wrex 3054  Vcvv 3398  cin 3842  wss 3843   cuni 4796  ccnv 5524  dom cdm 5525  ran crn 5526  cima 5528  Fun wfun 6333   Fn wfn 6334  wf 6335  cfv 6339  (class class class)co 7170  t crest 16797  Topctop 21644  TopOnctopon 21661   Cn ccn 21975
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2020  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2162  ax-12 2179  ax-ext 2710  ax-rep 5154  ax-sep 5167  ax-nul 5174  ax-pow 5232  ax-pr 5296  ax-un 7479
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 847  df-3or 1089  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2075  df-mo 2540  df-eu 2570  df-clab 2717  df-cleq 2730  df-clel 2811  df-nfc 2881  df-ne 2935  df-ral 3058  df-rex 3059  df-reu 3060  df-rab 3062  df-v 3400  df-sbc 3681  df-csb 3791  df-dif 3846  df-un 3848  df-in 3850  df-ss 3860  df-pss 3862  df-nul 4212  df-if 4415  df-pw 4490  df-sn 4517  df-pr 4519  df-tp 4521  df-op 4523  df-uni 4797  df-int 4837  df-iun 4883  df-br 5031  df-opab 5093  df-mpt 5111  df-tr 5137  df-id 5429  df-eprel 5434  df-po 5442  df-so 5443  df-fr 5483  df-we 5485  df-xp 5531  df-rel 5532  df-cnv 5533  df-co 5534  df-dm 5535  df-rn 5536  df-res 5537  df-ima 5538  df-ord 6175  df-on 6176  df-lim 6177  df-suc 6178  df-iota 6297  df-fun 6341  df-fn 6342  df-f 6343  df-f1 6344  df-fo 6345  df-f1o 6346  df-fv 6347  df-ov 7173  df-oprab 7174  df-mpo 7175  df-om 7600  df-1st 7714  df-2nd 7715  df-map 8439  df-en 8556  df-fin 8559  df-fi 8948  df-rest 16799  df-topgen 16820  df-top 21645  df-topon 21662  df-bases 21697  df-cn 21978
This theorem is referenced by:  cnrest2r  22038  rncmp  22147  connima  22176  conncn  22177  kgencn2  22308  kgencn3  22309  qtoprest  22468  hmeores  22522  efmndtmd  22852  submtmd  22855  subgtgp  22856  symgtgp  22857  metdcn2  23591  metdscn2  23609  cnmptre  23679  iimulcn  23690  icchmeo  23693  evth  23711  evth2  23712  lebnumlem2  23714  reparphti  23749  efrlim  25707  rmulccn  31450  raddcn  31451  xrge0mulc1cn  31463  cvxpconn  32775  cvxsconn  32776  cvmliftmolem1  32814  cvmliftlem8  32825  cvmlift2lem9  32844  cvmlift3lem6  32857  ivthALT  34162  knoppcnlem10  34320  broucube  35434  areacirclem2  35489  cnres2  35544  cnresima  35545  refsumcn  42111  icccncfext  42970
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