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Theorem depindlem3 16348
Description: Lemma for depind 16349. (Contributed by Matthew House, 14-Apr-2026.)
Hypotheses
Ref Expression
depind.p (𝜑𝑃:ℕ0⟶V)
depind.0 (𝜑𝐴 ∈ (𝑃‘0))
depind.h (𝜑 → ∀𝑛 ∈ ℕ0 (𝐻𝑛):(𝑃𝑛)⟶(𝑃‘(𝑛 + 1)))
depindlem1.4 𝐹 = seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))
Assertion
Ref Expression
depindlem3 (𝜑 → ∀𝑓X 𝑛 ∈ ℕ0 (𝑃𝑛)(((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛))) → 𝑓 = 𝐹))
Distinct variable groups:   𝑓,,𝑛,𝑥   𝜑,𝑓   𝐴,𝑓,𝑚,𝑛   𝑛,𝐹   𝑓,𝐻,𝑚,𝑛   𝑃,𝑓,𝑛
Allowed substitution hints:   𝜑(𝑥,,𝑚,𝑛)   𝐴(𝑥,)   𝑃(𝑥,,𝑚)   𝐹(𝑥,𝑓,,𝑚)   𝐻(𝑥,)

Proof of Theorem depindlem3
Dummy variables 𝑦 𝑘 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ixpfn 6873 . . . . 5 (𝑓X𝑛 ∈ ℕ0 (𝑃𝑛) → 𝑓 Fn ℕ0)
21ad2antlr 489 . . . 4 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝑓 Fn ℕ0)
3 depind.p . . . . . . . 8 (𝜑𝑃:ℕ0⟶V)
4 depind.0 . . . . . . . 8 (𝜑𝐴 ∈ (𝑃‘0))
5 depind.h . . . . . . . 8 (𝜑 → ∀𝑛 ∈ ℕ0 (𝐻𝑛):(𝑃𝑛)⟶(𝑃‘(𝑛 + 1)))
6 depindlem1.4 . . . . . . . 8 𝐹 = seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))
73, 4, 5, 6depindlem1 16346 . . . . . . 7 (𝜑 → (𝐹:ℕ0⟶V ∧ (𝐹‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛))))
87ad2antrr 488 . . . . . 6 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝐹:ℕ0⟶V ∧ (𝐹‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛))))
98simp1d 1035 . . . . 5 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝐹:ℕ0⟶V)
109ffnd 5483 . . . 4 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝐹 Fn ℕ0)
11 fveq2 5639 . . . . . . . 8 (𝑦 = 0 → (𝑓𝑦) = (𝑓‘0))
12 fveq2 5639 . . . . . . . 8 (𝑦 = 0 → (𝐹𝑦) = (𝐹‘0))
1311, 12eqeq12d 2246 . . . . . . 7 (𝑦 = 0 → ((𝑓𝑦) = (𝐹𝑦) ↔ (𝑓‘0) = (𝐹‘0)))
1413imbi2d 230 . . . . . 6 (𝑦 = 0 → ((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓𝑦) = (𝐹𝑦)) ↔ (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓‘0) = (𝐹‘0))))
15 fveq2 5639 . . . . . . . 8 (𝑦 = 𝑘 → (𝑓𝑦) = (𝑓𝑘))
16 fveq2 5639 . . . . . . . 8 (𝑦 = 𝑘 → (𝐹𝑦) = (𝐹𝑘))
1715, 16eqeq12d 2246 . . . . . . 7 (𝑦 = 𝑘 → ((𝑓𝑦) = (𝐹𝑦) ↔ (𝑓𝑘) = (𝐹𝑘)))
1817imbi2d 230 . . . . . 6 (𝑦 = 𝑘 → ((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓𝑦) = (𝐹𝑦)) ↔ (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓𝑘) = (𝐹𝑘))))
19 fveq2 5639 . . . . . . . 8 (𝑦 = (𝑘 + 1) → (𝑓𝑦) = (𝑓‘(𝑘 + 1)))
20 fveq2 5639 . . . . . . . 8 (𝑦 = (𝑘 + 1) → (𝐹𝑦) = (𝐹‘(𝑘 + 1)))
2119, 20eqeq12d 2246 . . . . . . 7 (𝑦 = (𝑘 + 1) → ((𝑓𝑦) = (𝐹𝑦) ↔ (𝑓‘(𝑘 + 1)) = (𝐹‘(𝑘 + 1))))
2221imbi2d 230 . . . . . 6 (𝑦 = (𝑘 + 1) → ((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓𝑦) = (𝐹𝑦)) ↔ (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓‘(𝑘 + 1)) = (𝐹‘(𝑘 + 1)))))
23 simprl 531 . . . . . . 7 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓‘0) = 𝐴)
248simp2d 1036 . . . . . . 7 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝐹‘0) = 𝐴)
2523, 24eqtr4d 2267 . . . . . 6 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓‘0) = (𝐹‘0))
26 fveq2 5639 . . . . . . . . . . 11 ((𝑓𝑘) = (𝐹𝑘) → ((𝐻𝑘)‘(𝑓𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
2726ad2antlr 489 . . . . . . . . . 10 (((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) ∧ (𝑓𝑘) = (𝐹𝑘)) ∧ 𝑘 ∈ ℕ0) → ((𝐻𝑘)‘(𝑓𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
28 simplrr 538 . . . . . . . . . . 11 ((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) ∧ (𝑓𝑘) = (𝐹𝑘)) → ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))
29 fvoveq1 6041 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝑓‘(𝑛 + 1)) = (𝑓‘(𝑘 + 1)))
30 fveq2 5639 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐻𝑛) = (𝐻𝑘))
31 fveq2 5639 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝑓𝑛) = (𝑓𝑘))
3230, 31fveq12d 5646 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝑓𝑛)) = ((𝐻𝑘)‘(𝑓𝑘)))
3329, 32eqeq12d 2246 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)) ↔ (𝑓‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝑓𝑘))))
3433rspccva 2909 . . . . . . . . . . 11 ((∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)) ∧ 𝑘 ∈ ℕ0) → (𝑓‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝑓𝑘)))
3528, 34sylan 283 . . . . . . . . . 10 (((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) ∧ (𝑓𝑘) = (𝐹𝑘)) ∧ 𝑘 ∈ ℕ0) → (𝑓‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝑓𝑘)))
368simp3d 1037 . . . . . . . . . . . 12 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → ∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)))
3736adantr 276 . . . . . . . . . . 11 ((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) ∧ (𝑓𝑘) = (𝐹𝑘)) → ∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)))
38 fvoveq1 6041 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝐹‘(𝑛 + 1)) = (𝐹‘(𝑘 + 1)))
39 fveq2 5639 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐹𝑛) = (𝐹𝑘))
4030, 39fveq12d 5646 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝐹𝑛)) = ((𝐻𝑘)‘(𝐹𝑘)))
4138, 40eqeq12d 2246 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)) ↔ (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘))))
4241rspccva 2909 . . . . . . . . . . 11 ((∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)) ∧ 𝑘 ∈ ℕ0) → (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘)))
4337, 42sylan 283 . . . . . . . . . 10 (((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) ∧ (𝑓𝑘) = (𝐹𝑘)) ∧ 𝑘 ∈ ℕ0) → (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘)))
4427, 35, 433eqtr4d 2274 . . . . . . . . 9 (((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) ∧ (𝑓𝑘) = (𝐹𝑘)) ∧ 𝑘 ∈ ℕ0) → (𝑓‘(𝑘 + 1)) = (𝐹‘(𝑘 + 1)))
4544exp31 364 . . . . . . . 8 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → ((𝑓𝑘) = (𝐹𝑘) → (𝑘 ∈ ℕ0 → (𝑓‘(𝑘 + 1)) = (𝐹‘(𝑘 + 1)))))
4645com3r 79 . . . . . . 7 (𝑘 ∈ ℕ0 → (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → ((𝑓𝑘) = (𝐹𝑘) → (𝑓‘(𝑘 + 1)) = (𝐹‘(𝑘 + 1)))))
4746a2d 26 . . . . . 6 (𝑘 ∈ ℕ0 → ((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓𝑘) = (𝐹𝑘)) → (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓‘(𝑘 + 1)) = (𝐹‘(𝑘 + 1)))))
4814, 18, 22, 18, 25, 47nn0ind 9594 . . . . 5 (𝑘 ∈ ℕ0 → (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓𝑘) = (𝐹𝑘)))
4948impcom 125 . . . 4 ((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) ∧ 𝑘 ∈ ℕ0) → (𝑓𝑘) = (𝐹𝑘))
502, 10, 49eqfnfvd 5747 . . 3 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝑓 = 𝐹)
5150ex 115 . 2 ((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) → (((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛))) → 𝑓 = 𝐹))
5251ralrimiva 2605 1 (𝜑 → ∀𝑓X 𝑛 ∈ ℕ0 (𝑃𝑛)(((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛))) → 𝑓 = 𝐹))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  w3a 1004   = wceq 1397  wcel 2202  wral 2510  Vcvv 2802  ifcif 3605  cmpt 4150   Fn wfn 5321  wf 5322  cfv 5326  (class class class)co 6018  cmpo 6020  Xcixp 6867  0cc0 8032  1c1 8033   + caddc 8035  cmin 8350  0cn0 9402  seqcseq 10710
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-iinf 4686  ax-cnex 8123  ax-resscn 8124  ax-1cn 8125  ax-1re 8126  ax-icn 8127  ax-addcl 8128  ax-addrcl 8129  ax-mulcl 8130  ax-addcom 8132  ax-addass 8134  ax-distr 8136  ax-i2m1 8137  ax-0lt1 8138  ax-0id 8140  ax-rnegex 8141  ax-cnre 8143  ax-pre-ltirr 8144  ax-pre-ltwlin 8145  ax-pre-lttrn 8146  ax-pre-ltadd 8148
This theorem depends on definitions:  df-bi 117  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-if 3606  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-tr 4188  df-id 4390  df-iord 4463  df-on 4465  df-ilim 4466  df-suc 4468  df-iom 4689  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5971  df-ov 6021  df-oprab 6022  df-mpo 6023  df-1st 6303  df-2nd 6304  df-recs 6471  df-frec 6557  df-ixp 6868  df-pnf 8216  df-mnf 8217  df-xr 8218  df-ltxr 8219  df-le 8220  df-sub 8352  df-neg 8353  df-inn 9144  df-n0 9403  df-z 9480  df-uz 9756  df-seqfrec 10711
This theorem is referenced by:  depind  16349
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