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Theorem finxpreclem4 34812
Description: Lemma for ↑↑ recursion theorems. (Contributed by ML, 23-Oct-2020.)
Hypothesis
Ref Expression
finxpreclem4.1 𝐹 = (𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1o𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))
Assertion
Ref Expression
finxpreclem4 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘𝑁) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘ 𝑁))
Distinct variable groups:   𝑛,𝑁,𝑥   𝑈,𝑛,𝑥   𝑦,𝑛,𝑥
Allowed substitution hints:   𝑈(𝑦)   𝐹(𝑥,𝑦,𝑛)   𝑁(𝑦)

Proof of Theorem finxpreclem4
Dummy variable 𝑜 is distinct from all other variables.
StepHypRef Expression
1 2onn 8253 . . . . . . . 8 2o ∈ ω
2 nnon 7570 . . . . . . . . . . 11 (𝑁 ∈ ω → 𝑁 ∈ On)
3 2on 8098 . . . . . . . . . . . . . 14 2o ∈ On
4 oawordeu 8168 . . . . . . . . . . . . . 14 (((2o ∈ On ∧ 𝑁 ∈ On) ∧ 2o𝑁) → ∃!𝑜 ∈ On (2o +o 𝑜) = 𝑁)
53, 4mpanl1 699 . . . . . . . . . . . . 13 ((𝑁 ∈ On ∧ 2o𝑁) → ∃!𝑜 ∈ On (2o +o 𝑜) = 𝑁)
6 riotasbc 7115 . . . . . . . . . . . . 13 (∃!𝑜 ∈ On (2o +o 𝑜) = 𝑁[(𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜](2o +o 𝑜) = 𝑁)
75, 6syl 17 . . . . . . . . . . . 12 ((𝑁 ∈ On ∧ 2o𝑁) → [(𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜](2o +o 𝑜) = 𝑁)
8 riotaex 7101 . . . . . . . . . . . . . 14 (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ V
9 sbceq1g 4325 . . . . . . . . . . . . . 14 ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ V → ([(𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜](2o +o 𝑜) = 𝑁(𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜(2o +o 𝑜) = 𝑁))
108, 9ax-mp 5 . . . . . . . . . . . . 13 ([(𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜](2o +o 𝑜) = 𝑁(𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜(2o +o 𝑜) = 𝑁)
11 csbov2g 7185 . . . . . . . . . . . . . . . 16 ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ V → (𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜(2o +o 𝑜) = (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜𝑜))
128, 11ax-mp 5 . . . . . . . . . . . . . . 15 (𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜(2o +o 𝑜) = (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜𝑜)
138csbvargi 4343 . . . . . . . . . . . . . . . 16 (𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜𝑜 = (𝑜 ∈ On (2o +o 𝑜) = 𝑁)
1413oveq2i 7150 . . . . . . . . . . . . . . 15 (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜𝑜) = (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))
1512, 14eqtri 2824 . . . . . . . . . . . . . 14 (𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜(2o +o 𝑜) = (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))
1615eqeq1i 2806 . . . . . . . . . . . . 13 ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜(2o +o 𝑜) = 𝑁 ↔ (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) = 𝑁)
1710, 16bitri 278 . . . . . . . . . . . 12 ([(𝑜 ∈ On (2o +o 𝑜) = 𝑁) / 𝑜](2o +o 𝑜) = 𝑁 ↔ (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) = 𝑁)
187, 17sylib 221 . . . . . . . . . . 11 ((𝑁 ∈ On ∧ 2o𝑁) → (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) = 𝑁)
192, 18sylan 583 . . . . . . . . . 10 ((𝑁 ∈ ω ∧ 2o𝑁) → (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) = 𝑁)
20 simpl 486 . . . . . . . . . 10 ((𝑁 ∈ ω ∧ 2o𝑁) → 𝑁 ∈ ω)
2119, 20eqeltrd 2893 . . . . . . . . 9 ((𝑁 ∈ ω ∧ 2o𝑁) → (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ∈ ω)
22 riotacl 7114 . . . . . . . . . . 11 (∃!𝑜 ∈ On (2o +o 𝑜) = 𝑁 → (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ On)
23 riotaund 7136 . . . . . . . . . . . 12 (¬ ∃!𝑜 ∈ On (2o +o 𝑜) = 𝑁 → (𝑜 ∈ On (2o +o 𝑜) = 𝑁) = ∅)
24 0elon 6216 . . . . . . . . . . . 12 ∅ ∈ On
2523, 24eqeltrdi 2901 . . . . . . . . . . 11 (¬ ∃!𝑜 ∈ On (2o +o 𝑜) = 𝑁 → (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ On)
2622, 25pm2.61i 185 . . . . . . . . . 10 (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ On
27 nnarcl 8229 . . . . . . . . . . . 12 ((2o ∈ On ∧ (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ On) → ((2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ∈ ω ↔ (2o ∈ ω ∧ (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω)))
283, 27mpan 689 . . . . . . . . . . 11 ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ On → ((2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ∈ ω ↔ (2o ∈ ω ∧ (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω)))
291biantrur 534 . . . . . . . . . . 11 ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω ↔ (2o ∈ ω ∧ (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω))
3028, 29syl6bbr 292 . . . . . . . . . 10 ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ On → ((2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ∈ ω ↔ (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω))
3126, 30ax-mp 5 . . . . . . . . 9 ((2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ∈ ω ↔ (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω)
3221, 31sylib 221 . . . . . . . 8 ((𝑁 ∈ ω ∧ 2o𝑁) → (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω)
33 nnacom 8230 . . . . . . . 8 ((2o ∈ ω ∧ (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω) → (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) = ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 2o))
341, 32, 33sylancr 590 . . . . . . 7 ((𝑁 ∈ ω ∧ 2o𝑁) → (2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) = ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 2o))
35 df-2o 8090 . . . . . . . . 9 2o = suc 1o
3635oveq2i 7150 . . . . . . . 8 ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 2o) = ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o suc 1o)
37 1onn 8252 . . . . . . . . 9 1o ∈ ω
38 nnasuc 8219 . . . . . . . . 9 (((𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω ∧ 1o ∈ ω) → ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o suc 1o) = suc ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 1o))
3932, 37, 38sylancl 589 . . . . . . . 8 ((𝑁 ∈ ω ∧ 2o𝑁) → ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o suc 1o) = suc ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 1o))
4036, 39syl5eq 2848 . . . . . . 7 ((𝑁 ∈ ω ∧ 2o𝑁) → ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 2o) = suc ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 1o))
4134, 19, 403eqtr3d 2844 . . . . . 6 ((𝑁 ∈ ω ∧ 2o𝑁) → 𝑁 = suc ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 1o))
422adantr 484 . . . . . . 7 ((𝑁 ∈ ω ∧ 2o𝑁) → 𝑁 ∈ On)
43 sucidg 6241 . . . . . . . . . . . 12 (1o ∈ ω → 1o ∈ suc 1o)
4437, 43ax-mp 5 . . . . . . . . . . 11 1o ∈ suc 1o
4544, 35eleqtrri 2892 . . . . . . . . . 10 1o ∈ 2o
46 ssel 3911 . . . . . . . . . 10 (2o𝑁 → (1o ∈ 2o → 1o𝑁))
4745, 46mpi 20 . . . . . . . . 9 (2o𝑁 → 1o𝑁)
4847ne0d 4254 . . . . . . . 8 (2o𝑁𝑁 ≠ ∅)
4948adantl 485 . . . . . . 7 ((𝑁 ∈ ω ∧ 2o𝑁) → 𝑁 ≠ ∅)
50 nnlim 7577 . . . . . . . 8 (𝑁 ∈ ω → ¬ Lim 𝑁)
5150adantr 484 . . . . . . 7 ((𝑁 ∈ ω ∧ 2o𝑁) → ¬ Lim 𝑁)
52 onsucuni3 34785 . . . . . . 7 ((𝑁 ∈ On ∧ 𝑁 ≠ ∅ ∧ ¬ Lim 𝑁) → 𝑁 = suc 𝑁)
5342, 49, 51, 52syl3anc 1368 . . . . . 6 ((𝑁 ∈ ω ∧ 2o𝑁) → 𝑁 = suc 𝑁)
54 nnacom 8230 . . . . . . . 8 (((𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω ∧ 1o ∈ ω) → ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 1o) = (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)))
5532, 37, 54sylancl 589 . . . . . . 7 ((𝑁 ∈ ω ∧ 2o𝑁) → ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 1o) = (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)))
56 suceq 6228 . . . . . . 7 (((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 1o) = (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) → suc ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 1o) = suc (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)))
5755, 56syl 17 . . . . . 6 ((𝑁 ∈ ω ∧ 2o𝑁) → suc ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) +o 1o) = suc (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)))
5841, 53, 573eqtr3d 2844 . . . . 5 ((𝑁 ∈ ω ∧ 2o𝑁) → suc 𝑁 = suc (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)))
59 ordom 7573 . . . . . . . . 9 Ord ω
60 ordelss 6179 . . . . . . . . 9 ((Ord ω ∧ 𝑁 ∈ ω) → 𝑁 ⊆ ω)
6159, 60mpan 689 . . . . . . . 8 (𝑁 ∈ ω → 𝑁 ⊆ ω)
62 nnfi 8700 . . . . . . . 8 (𝑁 ∈ ω → 𝑁 ∈ Fin)
63 nnunifi 8757 . . . . . . . 8 ((𝑁 ⊆ ω ∧ 𝑁 ∈ Fin) → 𝑁 ∈ ω)
6461, 62, 63syl2anc 587 . . . . . . 7 (𝑁 ∈ ω → 𝑁 ∈ ω)
6564adantr 484 . . . . . 6 ((𝑁 ∈ ω ∧ 2o𝑁) → 𝑁 ∈ ω)
66 nnacl 8224 . . . . . . 7 ((1o ∈ ω ∧ (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω) → (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ∈ ω)
6737, 32, 66sylancr 590 . . . . . 6 ((𝑁 ∈ ω ∧ 2o𝑁) → (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ∈ ω)
68 peano4 7588 . . . . . 6 (( 𝑁 ∈ ω ∧ (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ∈ ω) → (suc 𝑁 = suc (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ↔ 𝑁 = (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))))
6965, 67, 68syl2anc 587 . . . . 5 ((𝑁 ∈ ω ∧ 2o𝑁) → (suc 𝑁 = suc (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)) ↔ 𝑁 = (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))))
7058, 69mpbid 235 . . . 4 ((𝑁 ∈ ω ∧ 2o𝑁) → 𝑁 = (1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)))
7170fveq2d 6653 . . 3 ((𝑁 ∈ ω ∧ 2o𝑁) → (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘ 𝑁) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘(1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))))
7271adantr 484 . 2 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘ 𝑁) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘(1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))))
7332adantr 484 . . 3 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω)
74 df-1o 8089 . . . . . . . 8 1o = suc ∅
7574fveq2i 6652 . . . . . . 7 (rec(𝐹, ⟨𝑁, 𝑦⟩)‘1o) = (rec(𝐹, ⟨𝑁, 𝑦⟩)‘suc ∅)
76 rdgsuc 8047 . . . . . . . 8 (∅ ∈ On → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘suc ∅) = (𝐹‘(rec(𝐹, ⟨𝑁, 𝑦⟩)‘∅)))
7724, 76ax-mp 5 . . . . . . 7 (rec(𝐹, ⟨𝑁, 𝑦⟩)‘suc ∅) = (𝐹‘(rec(𝐹, ⟨𝑁, 𝑦⟩)‘∅))
78 opex 5324 . . . . . . . . 9 𝑁, 𝑦⟩ ∈ V
7978rdg0 8044 . . . . . . . 8 (rec(𝐹, ⟨𝑁, 𝑦⟩)‘∅) = ⟨𝑁, 𝑦
8079fveq2i 6652 . . . . . . 7 (𝐹‘(rec(𝐹, ⟨𝑁, 𝑦⟩)‘∅)) = (𝐹‘⟨𝑁, 𝑦⟩)
8175, 77, 803eqtri 2828 . . . . . 6 (rec(𝐹, ⟨𝑁, 𝑦⟩)‘1o) = (𝐹‘⟨𝑁, 𝑦⟩)
82 finxpreclem4.1 . . . . . . 7 𝐹 = (𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1o𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))
8382finxpreclem3 34811 . . . . . 6 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → ⟨ 𝑁, (1st𝑦)⟩ = (𝐹‘⟨𝑁, 𝑦⟩))
8481, 83eqtr4id 2855 . . . . 5 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘1o) = ⟨ 𝑁, (1st𝑦)⟩)
8584fveq2d 6653 . . . 4 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → (𝐹‘(rec(𝐹, ⟨𝑁, 𝑦⟩)‘1o)) = (𝐹‘⟨ 𝑁, (1st𝑦)⟩))
86 2on0 8100 . . . . . 6 2o ≠ ∅
87 nnlim 7577 . . . . . . 7 (2o ∈ ω → ¬ Lim 2o)
881, 87ax-mp 5 . . . . . 6 ¬ Lim 2o
89 rdgsucuni 34787 . . . . . 6 ((2o ∈ On ∧ 2o ≠ ∅ ∧ ¬ Lim 2o) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘2o) = (𝐹‘(rec(𝐹, ⟨𝑁, 𝑦⟩)‘ 2o)))
903, 86, 88, 89mp3an 1458 . . . . 5 (rec(𝐹, ⟨𝑁, 𝑦⟩)‘2o) = (𝐹‘(rec(𝐹, ⟨𝑁, 𝑦⟩)‘ 2o))
91 1oequni2o 34786 . . . . . . 7 1o = 2o
9291fveq2i 6652 . . . . . 6 (rec(𝐹, ⟨𝑁, 𝑦⟩)‘1o) = (rec(𝐹, ⟨𝑁, 𝑦⟩)‘ 2o)
9392fveq2i 6652 . . . . 5 (𝐹‘(rec(𝐹, ⟨𝑁, 𝑦⟩)‘1o)) = (𝐹‘(rec(𝐹, ⟨𝑁, 𝑦⟩)‘ 2o))
9490, 93eqtr4i 2827 . . . 4 (rec(𝐹, ⟨𝑁, 𝑦⟩)‘2o) = (𝐹‘(rec(𝐹, ⟨𝑁, 𝑦⟩)‘1o))
9574fveq2i 6652 . . . . 5 (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘1o) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘suc ∅)
96 rdgsuc 8047 . . . . . 6 (∅ ∈ On → (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘suc ∅) = (𝐹‘(rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘∅)))
9724, 96ax-mp 5 . . . . 5 (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘suc ∅) = (𝐹‘(rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘∅))
98 opex 5324 . . . . . . 7 𝑁, (1st𝑦)⟩ ∈ V
9998rdg0 8044 . . . . . 6 (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘∅) = ⟨ 𝑁, (1st𝑦)⟩
10099fveq2i 6652 . . . . 5 (𝐹‘(rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘∅)) = (𝐹‘⟨ 𝑁, (1st𝑦)⟩)
10195, 97, 1003eqtri 2828 . . . 4 (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘1o) = (𝐹‘⟨ 𝑁, (1st𝑦)⟩)
10285, 94, 1013eqtr4g 2861 . . 3 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘2o) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘1o))
103 1on 8096 . . . 4 1o ∈ On
104 rdgeqoa 34788 . . . 4 ((2o ∈ On ∧ 1o ∈ On ∧ (𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω) → ((rec(𝐹, ⟨𝑁, 𝑦⟩)‘2o) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘1o) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘(2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘(1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)))))
1053, 103, 104mp3an12 1448 . . 3 ((𝑜 ∈ On (2o +o 𝑜) = 𝑁) ∈ ω → ((rec(𝐹, ⟨𝑁, 𝑦⟩)‘2o) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘1o) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘(2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘(1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁)))))
10673, 102, 105sylc 65 . 2 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘(2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘(1o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))))
10719fveq2d 6653 . . 3 ((𝑁 ∈ ω ∧ 2o𝑁) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘(2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))) = (rec(𝐹, ⟨𝑁, 𝑦⟩)‘𝑁))
108107adantr 484 . 2 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘(2o +o (𝑜 ∈ On (2o +o 𝑜) = 𝑁))) = (rec(𝐹, ⟨𝑁, 𝑦⟩)‘𝑁))
10972, 106, 1083eqtr2rd 2843 1 (((𝑁 ∈ ω ∧ 2o𝑁) ∧ 𝑦 ∈ (V × 𝑈)) → (rec(𝐹, ⟨𝑁, 𝑦⟩)‘𝑁) = (rec(𝐹, ⟨ 𝑁, (1st𝑦)⟩)‘ 𝑁))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 209  wa 399   = wceq 1538  wcel 2112  wne 2990  ∃!wreu 3111  Vcvv 3444  [wsbc 3723  csb 3831  wss 3884  c0 4246  ifcif 4428  cop 4534   cuni 4803   × cxp 5521  Ord word 6162  Oncon0 6163  Lim wlim 6164  suc csuc 6165  cfv 6328  crio 7096  (class class class)co 7139  cmpo 7141  ωcom 7564  1st c1st 7673  reccrdg 8032  1oc1o 8082  2oc2o 8083   +o coa 8086  Fincfn 8496
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-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  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-reu 3116  df-rmo 3117  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-pss 3903  df-nul 4247  df-if 4429  df-pw 4502  df-sn 4529  df-pr 4531  df-tp 4533  df-op 4535  df-uni 4804  df-int 4842  df-iun 4886  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-pred 6120  df-ord 6166  df-on 6167  df-lim 6168  df-suc 6169  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-riota 7097  df-ov 7142  df-oprab 7143  df-mpo 7144  df-om 7565  df-wrecs 7934  df-recs 7995  df-rdg 8033  df-1o 8089  df-2o 8090  df-oadd 8093  df-er 8276  df-en 8497  df-dom 8498  df-sdom 8499  df-fin 8500
This theorem is referenced by:  finxpsuclem  34815
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