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Theorem fmucnd 22902
Description: The image of a Cauchy filter base by an uniformly continuous function is a Cauchy filter base. Deduction form. Proposition 3 of [BourbakiTop1] p. II.13. (Contributed by Thierry Arnoux, 18-Nov-2017.)
Hypotheses
Ref Expression
fmucnd.1 (𝜑𝑈 ∈ (UnifOn‘𝑋))
fmucnd.2 (𝜑𝑉 ∈ (UnifOn‘𝑌))
fmucnd.3 (𝜑𝐹 ∈ (𝑈 Cnu𝑉))
fmucnd.4 (𝜑𝐶 ∈ (CauFilu𝑈))
fmucnd.5 𝐷 = ran (𝑎𝐶 ↦ (𝐹𝑎))
Assertion
Ref Expression
fmucnd (𝜑𝐷 ∈ (CauFilu𝑉))
Distinct variable groups:   𝐶,𝑎   𝐷,𝑎   𝐹,𝑎   𝑉,𝑎   𝑋,𝑎   𝑌,𝑎   𝜑,𝑎
Allowed substitution hint:   𝑈(𝑎)

Proof of Theorem fmucnd
Dummy variables 𝑐 𝑏 𝑣 𝑟 𝑠 𝑡 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fmucnd.1 . . . 4 (𝜑𝑈 ∈ (UnifOn‘𝑋))
2 fmucnd.4 . . . 4 (𝜑𝐶 ∈ (CauFilu𝑈))
3 cfilufbas 22899 . . . 4 ((𝑈 ∈ (UnifOn‘𝑋) ∧ 𝐶 ∈ (CauFilu𝑈)) → 𝐶 ∈ (fBas‘𝑋))
41, 2, 3syl2anc 587 . . 3 (𝜑𝐶 ∈ (fBas‘𝑋))
5 fmucnd.2 . . . 4 (𝜑𝑉 ∈ (UnifOn‘𝑌))
6 fmucnd.3 . . . 4 (𝜑𝐹 ∈ (𝑈 Cnu𝑉))
7 isucn 22888 . . . . 5 ((𝑈 ∈ (UnifOn‘𝑋) ∧ 𝑉 ∈ (UnifOn‘𝑌)) → (𝐹 ∈ (𝑈 Cnu𝑉) ↔ (𝐹:𝑋𝑌 ∧ ∀𝑣𝑉𝑟𝑈𝑥𝑋𝑦𝑋 (𝑥𝑟𝑦 → (𝐹𝑥)𝑣(𝐹𝑦)))))
87simprbda 502 . . . 4 (((𝑈 ∈ (UnifOn‘𝑋) ∧ 𝑉 ∈ (UnifOn‘𝑌)) ∧ 𝐹 ∈ (𝑈 Cnu𝑉)) → 𝐹:𝑋𝑌)
91, 5, 6, 8syl21anc 836 . . 3 (𝜑𝐹:𝑋𝑌)
105elfvexd 6683 . . 3 (𝜑𝑌 ∈ V)
11 fmucnd.5 . . . 4 𝐷 = ran (𝑎𝐶 ↦ (𝐹𝑎))
1211fbasrn 22493 . . 3 ((𝐶 ∈ (fBas‘𝑋) ∧ 𝐹:𝑋𝑌𝑌 ∈ V) → 𝐷 ∈ (fBas‘𝑌))
134, 9, 10, 12syl3anc 1368 . 2 (𝜑𝐷 ∈ (fBas‘𝑌))
14 simplr 768 . . . . . . . 8 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → 𝑎𝐶)
15 eqid 2801 . . . . . . . 8 (𝐹𝑎) = (𝐹𝑎)
16 imaeq2 5896 . . . . . . . . 9 (𝑐 = 𝑎 → (𝐹𝑐) = (𝐹𝑎))
1716rspceeqv 3589 . . . . . . . 8 ((𝑎𝐶 ∧ (𝐹𝑎) = (𝐹𝑎)) → ∃𝑐𝐶 (𝐹𝑎) = (𝐹𝑐))
1814, 15, 17sylancl 589 . . . . . . 7 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → ∃𝑐𝐶 (𝐹𝑎) = (𝐹𝑐))
19 imaexg 7606 . . . . . . . . 9 (𝐹 ∈ (𝑈 Cnu𝑉) → (𝐹𝑎) ∈ V)
20 eqid 2801 . . . . . . . . . 10 (𝑐𝐶 ↦ (𝐹𝑐)) = (𝑐𝐶 ↦ (𝐹𝑐))
2120elrnmpt 5796 . . . . . . . . 9 ((𝐹𝑎) ∈ V → ((𝐹𝑎) ∈ ran (𝑐𝐶 ↦ (𝐹𝑐)) ↔ ∃𝑐𝐶 (𝐹𝑎) = (𝐹𝑐)))
226, 19, 213syl 18 . . . . . . . 8 (𝜑 → ((𝐹𝑎) ∈ ran (𝑐𝐶 ↦ (𝐹𝑐)) ↔ ∃𝑐𝐶 (𝐹𝑎) = (𝐹𝑐)))
2322ad3antrrr 729 . . . . . . 7 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → ((𝐹𝑎) ∈ ran (𝑐𝐶 ↦ (𝐹𝑐)) ↔ ∃𝑐𝐶 (𝐹𝑎) = (𝐹𝑐)))
2418, 23mpbird 260 . . . . . 6 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → (𝐹𝑎) ∈ ran (𝑐𝐶 ↦ (𝐹𝑐)))
25 imaeq2 5896 . . . . . . . . 9 (𝑎 = 𝑐 → (𝐹𝑎) = (𝐹𝑐))
2625cbvmptv 5136 . . . . . . . 8 (𝑎𝐶 ↦ (𝐹𝑎)) = (𝑐𝐶 ↦ (𝐹𝑐))
2726rneqi 5775 . . . . . . 7 ran (𝑎𝐶 ↦ (𝐹𝑎)) = ran (𝑐𝐶 ↦ (𝐹𝑐))
2811, 27eqtri 2824 . . . . . 6 𝐷 = ran (𝑐𝐶 ↦ (𝐹𝑐))
2924, 28eleqtrrdi 2904 . . . . 5 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → (𝐹𝑎) ∈ 𝐷)
309ffnd 6492 . . . . . . . 8 (𝜑𝐹 Fn 𝑋)
3130ad3antrrr 729 . . . . . . 7 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → 𝐹 Fn 𝑋)
32 fbelss 22442 . . . . . . . . 9 ((𝐶 ∈ (fBas‘𝑋) ∧ 𝑎𝐶) → 𝑎𝑋)
334, 32sylan 583 . . . . . . . 8 ((𝜑𝑎𝐶) → 𝑎𝑋)
3433ad4ant13 750 . . . . . . 7 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → 𝑎𝑋)
35 fmucndlem 22901 . . . . . . 7 ((𝐹 Fn 𝑋𝑎𝑋) → ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ (𝑎 × 𝑎)) = ((𝐹𝑎) × (𝐹𝑎)))
3631, 34, 35syl2anc 587 . . . . . 6 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ (𝑎 × 𝑎)) = ((𝐹𝑎) × (𝐹𝑎)))
37 eqid 2801 . . . . . . . . 9 (𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) = (𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩)
3837mpofun 7259 . . . . . . . 8 Fun (𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩)
39 funimass2 6411 . . . . . . . 8 ((Fun (𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ (𝑎 × 𝑎)) ⊆ 𝑣)
4038, 39mpan 689 . . . . . . 7 ((𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣) → ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ (𝑎 × 𝑎)) ⊆ 𝑣)
4140adantl 485 . . . . . 6 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ (𝑎 × 𝑎)) ⊆ 𝑣)
4236, 41eqsstrrd 3957 . . . . 5 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → ((𝐹𝑎) × (𝐹𝑎)) ⊆ 𝑣)
43 id 22 . . . . . . . 8 (𝑏 = (𝐹𝑎) → 𝑏 = (𝐹𝑎))
4443sqxpeqd 5555 . . . . . . 7 (𝑏 = (𝐹𝑎) → (𝑏 × 𝑏) = ((𝐹𝑎) × (𝐹𝑎)))
4544sseq1d 3949 . . . . . 6 (𝑏 = (𝐹𝑎) → ((𝑏 × 𝑏) ⊆ 𝑣 ↔ ((𝐹𝑎) × (𝐹𝑎)) ⊆ 𝑣))
4645rspcev 3574 . . . . 5 (((𝐹𝑎) ∈ 𝐷 ∧ ((𝐹𝑎) × (𝐹𝑎)) ⊆ 𝑣) → ∃𝑏𝐷 (𝑏 × 𝑏) ⊆ 𝑣)
4729, 42, 46syl2anc 587 . . . 4 ((((𝜑𝑣𝑉) ∧ 𝑎𝐶) ∧ (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣)) → ∃𝑏𝐷 (𝑏 × 𝑏) ⊆ 𝑣)
481adantr 484 . . . . 5 ((𝜑𝑣𝑉) → 𝑈 ∈ (UnifOn‘𝑋))
492adantr 484 . . . . 5 ((𝜑𝑣𝑉) → 𝐶 ∈ (CauFilu𝑈))
505adantr 484 . . . . . 6 ((𝜑𝑣𝑉) → 𝑉 ∈ (UnifOn‘𝑌))
516adantr 484 . . . . . 6 ((𝜑𝑣𝑉) → 𝐹 ∈ (𝑈 Cnu𝑉))
52 simpr 488 . . . . . 6 ((𝜑𝑣𝑉) → 𝑣𝑉)
53 nfcv 2958 . . . . . . 7 𝑠⟨(𝐹𝑥), (𝐹𝑦)⟩
54 nfcv 2958 . . . . . . 7 𝑡⟨(𝐹𝑥), (𝐹𝑦)⟩
55 nfcv 2958 . . . . . . 7 𝑥⟨(𝐹𝑠), (𝐹𝑡)⟩
56 nfcv 2958 . . . . . . 7 𝑦⟨(𝐹𝑠), (𝐹𝑡)⟩
57 simpl 486 . . . . . . . . 9 ((𝑥 = 𝑠𝑦 = 𝑡) → 𝑥 = 𝑠)
5857fveq2d 6653 . . . . . . . 8 ((𝑥 = 𝑠𝑦 = 𝑡) → (𝐹𝑥) = (𝐹𝑠))
59 simpr 488 . . . . . . . . 9 ((𝑥 = 𝑠𝑦 = 𝑡) → 𝑦 = 𝑡)
6059fveq2d 6653 . . . . . . . 8 ((𝑥 = 𝑠𝑦 = 𝑡) → (𝐹𝑦) = (𝐹𝑡))
6158, 60opeq12d 4776 . . . . . . 7 ((𝑥 = 𝑠𝑦 = 𝑡) → ⟨(𝐹𝑥), (𝐹𝑦)⟩ = ⟨(𝐹𝑠), (𝐹𝑡)⟩)
6253, 54, 55, 56, 61cbvmpo 7231 . . . . . 6 (𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) = (𝑠𝑋, 𝑡𝑋 ↦ ⟨(𝐹𝑠), (𝐹𝑡)⟩)
6348, 50, 51, 52, 62ucnprima 22892 . . . . 5 ((𝜑𝑣𝑉) → ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣) ∈ 𝑈)
64 cfiluexsm 22900 . . . . 5 ((𝑈 ∈ (UnifOn‘𝑋) ∧ 𝐶 ∈ (CauFilu𝑈) ∧ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣) ∈ 𝑈) → ∃𝑎𝐶 (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣))
6548, 49, 63, 64syl3anc 1368 . . . 4 ((𝜑𝑣𝑉) → ∃𝑎𝐶 (𝑎 × 𝑎) ⊆ ((𝑥𝑋, 𝑦𝑋 ↦ ⟨(𝐹𝑥), (𝐹𝑦)⟩) “ 𝑣))
6647, 65r19.29a 3251 . . 3 ((𝜑𝑣𝑉) → ∃𝑏𝐷 (𝑏 × 𝑏) ⊆ 𝑣)
6766ralrimiva 3152 . 2 (𝜑 → ∀𝑣𝑉𝑏𝐷 (𝑏 × 𝑏) ⊆ 𝑣)
68 iscfilu 22898 . . 3 (𝑉 ∈ (UnifOn‘𝑌) → (𝐷 ∈ (CauFilu𝑉) ↔ (𝐷 ∈ (fBas‘𝑌) ∧ ∀𝑣𝑉𝑏𝐷 (𝑏 × 𝑏) ⊆ 𝑣)))
695, 68syl 17 . 2 (𝜑 → (𝐷 ∈ (CauFilu𝑉) ↔ (𝐷 ∈ (fBas‘𝑌) ∧ ∀𝑣𝑉𝑏𝐷 (𝑏 × 𝑏) ⊆ 𝑣)))
7013, 67, 69mpbir2and 712 1 (𝜑𝐷 ∈ (CauFilu𝑉))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  wa 399   = wceq 1538  wcel 2112  wral 3109  wrex 3110  Vcvv 3444  wss 3884  cop 4534   class class class wbr 5033  cmpt 5113   × cxp 5521  ccnv 5522  ran crn 5524  cima 5526  Fun wfun 6322   Fn wfn 6323  wf 6324  cfv 6328  (class class class)co 7139  cmpo 7141  fBascfbas 20083  UnifOncust 22809   Cnucucn 22885  CauFiluccfilu 22896
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2159  ax-12 2176  ax-ext 2773  ax-rep 5157  ax-sep 5170  ax-nul 5177  ax-pow 5234  ax-pr 5298  ax-un 7445
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2601  df-eu 2632  df-clab 2780  df-cleq 2794  df-clel 2873  df-nfc 2941  df-ne 2991  df-nel 3095  df-ral 3114  df-rex 3115  df-rab 3118  df-v 3446  df-sbc 3724  df-csb 3832  df-dif 3887  df-un 3889  df-in 3891  df-ss 3901  df-nul 4247  df-if 4429  df-pw 4502  df-sn 4529  df-pr 4531  df-op 4535  df-uni 4804  df-iun 4886  df-br 5034  df-opab 5096  df-mpt 5114  df-id 5428  df-xp 5529  df-rel 5530  df-cnv 5531  df-co 5532  df-dm 5533  df-rn 5534  df-res 5535  df-ima 5536  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-fv 6336  df-ov 7142  df-oprab 7143  df-mpo 7144  df-1st 7675  df-2nd 7676  df-map 8395  df-fbas 20092  df-ust 22810  df-ucn 22886  df-cfilu 22897
This theorem is referenced by:  ucnextcn  22914
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