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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  ℂcc 10528  ℤcz 11973  ℤ≥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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