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Theorem lmff 21909
Description: If 𝐹 converges, there is some upper integer set on which 𝐹 is a total function. (Contributed by Mario Carneiro, 31-Dec-2013.)
Hypotheses
Ref Expression
lmff.1 𝑍 = (ℤ𝑀)
lmff.3 (𝜑𝐽 ∈ (TopOn‘𝑋))
lmff.4 (𝜑𝑀 ∈ ℤ)
lmff.5 (𝜑𝐹 ∈ dom (⇝𝑡𝐽))
Assertion
Ref Expression
lmff (𝜑 → ∃𝑗𝑍 (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋)
Distinct variable groups:   𝑗,𝐹   𝑗,𝐽   𝑗,𝑀   𝜑,𝑗   𝑗,𝑋   𝑗,𝑍

Proof of Theorem lmff
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 lmff.5 . . . . . 6 (𝜑𝐹 ∈ dom (⇝𝑡𝐽))
2 eldm2g 5736 . . . . . . 7 (𝐹 ∈ dom (⇝𝑡𝐽) → (𝐹 ∈ dom (⇝𝑡𝐽) ↔ ∃𝑦𝐹, 𝑦⟩ ∈ (⇝𝑡𝐽)))
32ibi 270 . . . . . 6 (𝐹 ∈ dom (⇝𝑡𝐽) → ∃𝑦𝐹, 𝑦⟩ ∈ (⇝𝑡𝐽))
41, 3syl 17 . . . . 5 (𝜑 → ∃𝑦𝐹, 𝑦⟩ ∈ (⇝𝑡𝐽))
5 df-br 5034 . . . . . 6 (𝐹(⇝𝑡𝐽)𝑦 ↔ ⟨𝐹, 𝑦⟩ ∈ (⇝𝑡𝐽))
65exbii 1849 . . . . 5 (∃𝑦 𝐹(⇝𝑡𝐽)𝑦 ↔ ∃𝑦𝐹, 𝑦⟩ ∈ (⇝𝑡𝐽))
74, 6sylibr 237 . . . 4 (𝜑 → ∃𝑦 𝐹(⇝𝑡𝐽)𝑦)
8 lmff.3 . . . . . 6 (𝜑𝐽 ∈ (TopOn‘𝑋))
9 lmcl 21905 . . . . . 6 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐹(⇝𝑡𝐽)𝑦) → 𝑦𝑋)
108, 9sylan 583 . . . . 5 ((𝜑𝐹(⇝𝑡𝐽)𝑦) → 𝑦𝑋)
11 eleq2 2881 . . . . . . 7 (𝑗 = 𝑋 → (𝑦𝑗𝑦𝑋))
12 feq3 6474 . . . . . . . 8 (𝑗 = 𝑋 → ((𝐹𝑥):𝑥𝑗 ↔ (𝐹𝑥):𝑥𝑋))
1312rexbidv 3259 . . . . . . 7 (𝑗 = 𝑋 → (∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑗 ↔ ∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑋))
1411, 13imbi12d 348 . . . . . 6 (𝑗 = 𝑋 → ((𝑦𝑗 → ∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑗) ↔ (𝑦𝑋 → ∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑋)))
158lmbr 21866 . . . . . . . 8 (𝜑 → (𝐹(⇝𝑡𝐽)𝑦 ↔ (𝐹 ∈ (𝑋pm ℂ) ∧ 𝑦𝑋 ∧ ∀𝑗𝐽 (𝑦𝑗 → ∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑗))))
1615biimpa 480 . . . . . . 7 ((𝜑𝐹(⇝𝑡𝐽)𝑦) → (𝐹 ∈ (𝑋pm ℂ) ∧ 𝑦𝑋 ∧ ∀𝑗𝐽 (𝑦𝑗 → ∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑗)))
1716simp3d 1141 . . . . . 6 ((𝜑𝐹(⇝𝑡𝐽)𝑦) → ∀𝑗𝐽 (𝑦𝑗 → ∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑗))
18 toponmax 21534 . . . . . . . 8 (𝐽 ∈ (TopOn‘𝑋) → 𝑋𝐽)
198, 18syl 17 . . . . . . 7 (𝜑𝑋𝐽)
2019adantr 484 . . . . . 6 ((𝜑𝐹(⇝𝑡𝐽)𝑦) → 𝑋𝐽)
2114, 17, 20rspcdva 3576 . . . . 5 ((𝜑𝐹(⇝𝑡𝐽)𝑦) → (𝑦𝑋 → ∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑋))
2210, 21mpd 15 . . . 4 ((𝜑𝐹(⇝𝑡𝐽)𝑦) → ∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑋)
237, 22exlimddv 1936 . . 3 (𝜑 → ∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑋)
24 uzf 12238 . . . 4 :ℤ⟶𝒫 ℤ
25 ffn 6491 . . . 4 (ℤ:ℤ⟶𝒫 ℤ → ℤ Fn ℤ)
26 reseq2 5817 . . . . . 6 (𝑥 = (ℤ𝑗) → (𝐹𝑥) = (𝐹 ↾ (ℤ𝑗)))
27 id 22 . . . . . 6 (𝑥 = (ℤ𝑗) → 𝑥 = (ℤ𝑗))
2826, 27feq12d 6479 . . . . 5 (𝑥 = (ℤ𝑗) → ((𝐹𝑥):𝑥𝑋 ↔ (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋))
2928rexrn 6834 . . . 4 (ℤ Fn ℤ → (∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑋 ↔ ∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋))
3024, 25, 29mp2b 10 . . 3 (∃𝑥 ∈ ran ℤ(𝐹𝑥):𝑥𝑋 ↔ ∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋)
3123, 30sylib 221 . 2 (𝜑 → ∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋)
32 lmff.4 . . . 4 (𝜑𝑀 ∈ ℤ)
33 lmff.1 . . . . 5 𝑍 = (ℤ𝑀)
3433rexuz3 14703 . . . 4 (𝑀 ∈ ℤ → (∃𝑗𝑍𝑥 ∈ (ℤ𝑗)(𝑥 ∈ dom 𝐹 ∧ (𝐹𝑥) ∈ 𝑋) ↔ ∃𝑗 ∈ ℤ ∀𝑥 ∈ (ℤ𝑗)(𝑥 ∈ dom 𝐹 ∧ (𝐹𝑥) ∈ 𝑋)))
3532, 34syl 17 . . 3 (𝜑 → (∃𝑗𝑍𝑥 ∈ (ℤ𝑗)(𝑥 ∈ dom 𝐹 ∧ (𝐹𝑥) ∈ 𝑋) ↔ ∃𝑗 ∈ ℤ ∀𝑥 ∈ (ℤ𝑗)(𝑥 ∈ dom 𝐹 ∧ (𝐹𝑥) ∈ 𝑋)))
3616simp1d 1139 . . . . . . 7 ((𝜑𝐹(⇝𝑡𝐽)𝑦) → 𝐹 ∈ (𝑋pm ℂ))
377, 36exlimddv 1936 . . . . . 6 (𝜑𝐹 ∈ (𝑋pm ℂ))
38 pmfun 8413 . . . . . 6 (𝐹 ∈ (𝑋pm ℂ) → Fun 𝐹)
3937, 38syl 17 . . . . 5 (𝜑 → Fun 𝐹)
40 ffvresb 6869 . . . . 5 (Fun 𝐹 → ((𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋 ↔ ∀𝑥 ∈ (ℤ𝑗)(𝑥 ∈ dom 𝐹 ∧ (𝐹𝑥) ∈ 𝑋)))
4139, 40syl 17 . . . 4 (𝜑 → ((𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋 ↔ ∀𝑥 ∈ (ℤ𝑗)(𝑥 ∈ dom 𝐹 ∧ (𝐹𝑥) ∈ 𝑋)))
4241rexbidv 3259 . . 3 (𝜑 → (∃𝑗𝑍 (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋 ↔ ∃𝑗𝑍𝑥 ∈ (ℤ𝑗)(𝑥 ∈ dom 𝐹 ∧ (𝐹𝑥) ∈ 𝑋)))
4341rexbidv 3259 . . 3 (𝜑 → (∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋 ↔ ∃𝑗 ∈ ℤ ∀𝑥 ∈ (ℤ𝑗)(𝑥 ∈ dom 𝐹 ∧ (𝐹𝑥) ∈ 𝑋)))
4435, 42, 433bitr4d 314 . 2 (𝜑 → (∃𝑗𝑍 (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋 ↔ ∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋))
4531, 44mpbird 260 1 (𝜑 → ∃𝑗𝑍 (𝐹 ↾ (ℤ𝑗)):(ℤ𝑗)⟶𝑋)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  wa 399  w3a 1084   = wceq 1538  wex 1781  wcel 2112  wral 3109  wrex 3110  𝒫 cpw 4500  cop 4534   class class class wbr 5033  dom cdm 5523  ran crn 5524  cres 5525  Fun wfun 6322   Fn wfn 6323  wf 6324  cfv 6328  (class class class)co 7139  pm cpm 8394  cc 10528  cz 11973  cuz 12235  TopOnctopon 21518  𝑡clm 21834
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-sep 5170  ax-nul 5177  ax-pow 5234  ax-pr 5298  ax-un 7445  ax-cnex 10586  ax-resscn 10587  ax-pre-lttri 10604  ax-pre-lttrn 10605
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  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-po 5442  df-so 5443  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-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336  df-ov 7142  df-oprab 7143  df-mpo 7144  df-1st 7675  df-2nd 7676  df-er 8276  df-pm 8396  df-en 8497  df-dom 8498  df-sdom 8499  df-pnf 10670  df-mnf 10671  df-xr 10672  df-ltxr 10673  df-le 10674  df-neg 10866  df-z 11974  df-uz 12236  df-top 21502  df-topon 21519  df-lm 21837
This theorem is referenced by:  lmle  23908
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