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Theorem tz7.44-3 8031
Description: The value of 𝐹 at a limit ordinal. Part 3 of Theorem 7.44 of [TakeutiZaring] p. 49. (Contributed by NM, 23-Apr-1995.) (Revised by David Abernethy, 19-Jun-2012.)
Hypotheses
Ref Expression
tz7.44.1 𝐺 = (𝑥 ∈ V ↦ if(𝑥 = ∅, 𝐴, if(Lim dom 𝑥, ran 𝑥, (𝐻‘(𝑥 dom 𝑥)))))
tz7.44.2 (𝑦𝑋 → (𝐹𝑦) = (𝐺‘(𝐹𝑦)))
tz7.44.3 (𝑦𝑋 → (𝐹𝑦) ∈ V)
tz7.44.4 𝐹 Fn 𝑋
tz7.44.5 Ord 𝑋
Assertion
Ref Expression
tz7.44-3 ((𝐵𝑋 ∧ Lim 𝐵) → (𝐹𝐵) = (𝐹𝐵))
Distinct variable groups:   𝑥,𝐴   𝑥,𝑦,𝐵   𝑥,𝐹,𝑦   𝑦,𝐺   𝑥,𝐻   𝑦,𝑋
Allowed substitution hints:   𝐴(𝑦)   𝐺(𝑥)   𝐻(𝑦)   𝑋(𝑥)

Proof of Theorem tz7.44-3
StepHypRef Expression
1 fveq2 6649 . . . . . 6 (𝑦 = 𝐵 → (𝐹𝑦) = (𝐹𝐵))
2 reseq2 5817 . . . . . . 7 (𝑦 = 𝐵 → (𝐹𝑦) = (𝐹𝐵))
32fveq2d 6653 . . . . . 6 (𝑦 = 𝐵 → (𝐺‘(𝐹𝑦)) = (𝐺‘(𝐹𝐵)))
41, 3eqeq12d 2817 . . . . 5 (𝑦 = 𝐵 → ((𝐹𝑦) = (𝐺‘(𝐹𝑦)) ↔ (𝐹𝐵) = (𝐺‘(𝐹𝐵))))
5 tz7.44.2 . . . . 5 (𝑦𝑋 → (𝐹𝑦) = (𝐺‘(𝐹𝑦)))
64, 5vtoclga 3525 . . . 4 (𝐵𝑋 → (𝐹𝐵) = (𝐺‘(𝐹𝐵)))
76adantr 484 . . 3 ((𝐵𝑋 ∧ Lim 𝐵) → (𝐹𝐵) = (𝐺‘(𝐹𝐵)))
82eleq1d 2877 . . . . . . 7 (𝑦 = 𝐵 → ((𝐹𝑦) ∈ V ↔ (𝐹𝐵) ∈ V))
9 tz7.44.3 . . . . . . 7 (𝑦𝑋 → (𝐹𝑦) ∈ V)
108, 9vtoclga 3525 . . . . . 6 (𝐵𝑋 → (𝐹𝐵) ∈ V)
1110adantr 484 . . . . 5 ((𝐵𝑋 ∧ Lim 𝐵) → (𝐹𝐵) ∈ V)
12 simpr 488 . . . . . . . . 9 ((𝐵𝑋 ∧ Lim 𝐵) → Lim 𝐵)
13 nlim0 6221 . . . . . . . . . . 11 ¬ Lim ∅
14 dmres 5844 . . . . . . . . . . . . . 14 dom (𝐹𝐵) = (𝐵 ∩ dom 𝐹)
15 tz7.44.5 . . . . . . . . . . . . . . . . . 18 Ord 𝑋
16 ordelss 6179 . . . . . . . . . . . . . . . . . 18 ((Ord 𝑋𝐵𝑋) → 𝐵𝑋)
1715, 16mpan 689 . . . . . . . . . . . . . . . . 17 (𝐵𝑋𝐵𝑋)
1817adantr 484 . . . . . . . . . . . . . . . 16 ((𝐵𝑋 ∧ Lim 𝐵) → 𝐵𝑋)
19 tz7.44.4 . . . . . . . . . . . . . . . . 17 𝐹 Fn 𝑋
20 fndm 6429 . . . . . . . . . . . . . . . . 17 (𝐹 Fn 𝑋 → dom 𝐹 = 𝑋)
2119, 20ax-mp 5 . . . . . . . . . . . . . . . 16 dom 𝐹 = 𝑋
2218, 21sseqtrrdi 3969 . . . . . . . . . . . . . . 15 ((𝐵𝑋 ∧ Lim 𝐵) → 𝐵 ⊆ dom 𝐹)
23 df-ss 3901 . . . . . . . . . . . . . . 15 (𝐵 ⊆ dom 𝐹 ↔ (𝐵 ∩ dom 𝐹) = 𝐵)
2422, 23sylib 221 . . . . . . . . . . . . . 14 ((𝐵𝑋 ∧ Lim 𝐵) → (𝐵 ∩ dom 𝐹) = 𝐵)
2514, 24syl5eq 2848 . . . . . . . . . . . . 13 ((𝐵𝑋 ∧ Lim 𝐵) → dom (𝐹𝐵) = 𝐵)
26 dmeq 5740 . . . . . . . . . . . . . 14 ((𝐹𝐵) = ∅ → dom (𝐹𝐵) = dom ∅)
27 dm0 5758 . . . . . . . . . . . . . 14 dom ∅ = ∅
2826, 27eqtrdi 2852 . . . . . . . . . . . . 13 ((𝐹𝐵) = ∅ → dom (𝐹𝐵) = ∅)
2925, 28sylan9req 2857 . . . . . . . . . . . 12 (((𝐵𝑋 ∧ Lim 𝐵) ∧ (𝐹𝐵) = ∅) → 𝐵 = ∅)
30 limeq 6175 . . . . . . . . . . . 12 (𝐵 = ∅ → (Lim 𝐵 ↔ Lim ∅))
3129, 30syl 17 . . . . . . . . . . 11 (((𝐵𝑋 ∧ Lim 𝐵) ∧ (𝐹𝐵) = ∅) → (Lim 𝐵 ↔ Lim ∅))
3213, 31mtbiri 330 . . . . . . . . . 10 (((𝐵𝑋 ∧ Lim 𝐵) ∧ (𝐹𝐵) = ∅) → ¬ Lim 𝐵)
3332ex 416 . . . . . . . . 9 ((𝐵𝑋 ∧ Lim 𝐵) → ((𝐹𝐵) = ∅ → ¬ Lim 𝐵))
3412, 33mt2d 138 . . . . . . . 8 ((𝐵𝑋 ∧ Lim 𝐵) → ¬ (𝐹𝐵) = ∅)
3534iffalsed 4439 . . . . . . 7 ((𝐵𝑋 ∧ Lim 𝐵) → if((𝐹𝐵) = ∅, 𝐴, if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵))))) = if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵)))))
36 limeq 6175 . . . . . . . . . 10 (dom (𝐹𝐵) = 𝐵 → (Lim dom (𝐹𝐵) ↔ Lim 𝐵))
3725, 36syl 17 . . . . . . . . 9 ((𝐵𝑋 ∧ Lim 𝐵) → (Lim dom (𝐹𝐵) ↔ Lim 𝐵))
3812, 37mpbird 260 . . . . . . . 8 ((𝐵𝑋 ∧ Lim 𝐵) → Lim dom (𝐹𝐵))
3938iftrued 4436 . . . . . . 7 ((𝐵𝑋 ∧ Lim 𝐵) → if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵)))) = ran (𝐹𝐵))
4035, 39eqtrd 2836 . . . . . 6 ((𝐵𝑋 ∧ Lim 𝐵) → if((𝐹𝐵) = ∅, 𝐴, if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵))))) = ran (𝐹𝐵))
41 rnexg 7599 . . . . . . 7 ((𝐹𝐵) ∈ V → ran (𝐹𝐵) ∈ V)
42 uniexg 7450 . . . . . . 7 (ran (𝐹𝐵) ∈ V → ran (𝐹𝐵) ∈ V)
4311, 41, 423syl 18 . . . . . 6 ((𝐵𝑋 ∧ Lim 𝐵) → ran (𝐹𝐵) ∈ V)
4440, 43eqeltrd 2893 . . . . 5 ((𝐵𝑋 ∧ Lim 𝐵) → if((𝐹𝐵) = ∅, 𝐴, if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵))))) ∈ V)
45 eqeq1 2805 . . . . . . 7 (𝑥 = (𝐹𝐵) → (𝑥 = ∅ ↔ (𝐹𝐵) = ∅))
46 dmeq 5740 . . . . . . . . 9 (𝑥 = (𝐹𝐵) → dom 𝑥 = dom (𝐹𝐵))
47 limeq 6175 . . . . . . . . 9 (dom 𝑥 = dom (𝐹𝐵) → (Lim dom 𝑥 ↔ Lim dom (𝐹𝐵)))
4846, 47syl 17 . . . . . . . 8 (𝑥 = (𝐹𝐵) → (Lim dom 𝑥 ↔ Lim dom (𝐹𝐵)))
49 rneq 5774 . . . . . . . . 9 (𝑥 = (𝐹𝐵) → ran 𝑥 = ran (𝐹𝐵))
5049unieqd 4817 . . . . . . . 8 (𝑥 = (𝐹𝐵) → ran 𝑥 = ran (𝐹𝐵))
51 fveq1 6648 . . . . . . . . . 10 (𝑥 = (𝐹𝐵) → (𝑥 dom 𝑥) = ((𝐹𝐵)‘ dom 𝑥))
5246unieqd 4817 . . . . . . . . . . 11 (𝑥 = (𝐹𝐵) → dom 𝑥 = dom (𝐹𝐵))
5352fveq2d 6653 . . . . . . . . . 10 (𝑥 = (𝐹𝐵) → ((𝐹𝐵)‘ dom 𝑥) = ((𝐹𝐵)‘ dom (𝐹𝐵)))
5451, 53eqtrd 2836 . . . . . . . . 9 (𝑥 = (𝐹𝐵) → (𝑥 dom 𝑥) = ((𝐹𝐵)‘ dom (𝐹𝐵)))
5554fveq2d 6653 . . . . . . . 8 (𝑥 = (𝐹𝐵) → (𝐻‘(𝑥 dom 𝑥)) = (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵))))
5648, 50, 55ifbieq12d 4455 . . . . . . 7 (𝑥 = (𝐹𝐵) → if(Lim dom 𝑥, ran 𝑥, (𝐻‘(𝑥 dom 𝑥))) = if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵)))))
5745, 56ifbieq2d 4453 . . . . . 6 (𝑥 = (𝐹𝐵) → if(𝑥 = ∅, 𝐴, if(Lim dom 𝑥, ran 𝑥, (𝐻‘(𝑥 dom 𝑥)))) = if((𝐹𝐵) = ∅, 𝐴, if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵))))))
58 tz7.44.1 . . . . . 6 𝐺 = (𝑥 ∈ V ↦ if(𝑥 = ∅, 𝐴, if(Lim dom 𝑥, ran 𝑥, (𝐻‘(𝑥 dom 𝑥)))))
5957, 58fvmptg 6747 . . . . 5 (((𝐹𝐵) ∈ V ∧ if((𝐹𝐵) = ∅, 𝐴, if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵))))) ∈ V) → (𝐺‘(𝐹𝐵)) = if((𝐹𝐵) = ∅, 𝐴, if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵))))))
6011, 44, 59syl2anc 587 . . . 4 ((𝐵𝑋 ∧ Lim 𝐵) → (𝐺‘(𝐹𝐵)) = if((𝐹𝐵) = ∅, 𝐴, if(Lim dom (𝐹𝐵), ran (𝐹𝐵), (𝐻‘((𝐹𝐵)‘ dom (𝐹𝐵))))))
6160, 40eqtrd 2836 . . 3 ((𝐵𝑋 ∧ Lim 𝐵) → (𝐺‘(𝐹𝐵)) = ran (𝐹𝐵))
627, 61eqtrd 2836 . 2 ((𝐵𝑋 ∧ Lim 𝐵) → (𝐹𝐵) = ran (𝐹𝐵))
63 df-ima 5536 . . 3 (𝐹𝐵) = ran (𝐹𝐵)
6463unieqi 4816 . 2 (𝐹𝐵) = ran (𝐹𝐵)
6562, 64eqtr4di 2854 1 ((𝐵𝑋 ∧ Lim 𝐵) → (𝐹𝐵) = (𝐹𝐵))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 209  wa 399   = wceq 1538  wcel 2112  Vcvv 3444  cin 3883  wss 3884  c0 4246  ifcif 4428   cuni 4803  cmpt 5113  dom cdm 5523  ran crn 5524  cres 5525  cima 5526  Ord word 6162  Lim wlim 6164   Fn wfn 6323  cfv 6328
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-pr 5298  ax-un 7445
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-ral 3114  df-rex 3115  df-rab 3118  df-v 3446  df-sbc 3724  df-dif 3887  df-un 3889  df-in 3891  df-ss 3901  df-pss 3903  df-nul 4247  df-if 4429  df-pw 4502  df-sn 4529  df-pr 4531  df-op 4535  df-uni 4804  df-br 5034  df-opab 5096  df-mpt 5114  df-tr 5140  df-id 5428  df-eprel 5433  df-po 5442  df-so 5443  df-fr 5482  df-we 5484  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-ord 6166  df-lim 6168  df-iota 6287  df-fun 6330  df-fn 6331  df-fv 6336
This theorem is referenced by:  rdglimg  8048
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