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Theorem depindlem3 16732
Description: Lemma for depind 16733. (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 6980 . . . . 5 (𝑓X𝑛 ∈ ℕ0 (𝑃𝑛) → 𝑓 Fn ℕ0)
21ad2antlr 493 . . . 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 16730 . . . . . . 7 (𝜑 → (𝐹:ℕ0⟶V ∧ (𝐹‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛))))
87ad2antrr 492 . . . . . 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 1040 . . . . 5 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝐹:ℕ0⟶V)
109ffnd 5532 . . . 4 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝐹 Fn ℕ0)
11 fveq2 5693 . . . . . . . 8 (𝑦 = 0 → (𝑓𝑦) = (𝑓‘0))
12 fveq2 5693 . . . . . . . 8 (𝑦 = 0 → (𝐹𝑦) = (𝐹‘0))
1311, 12eqeq12d 2253 . . . . . . 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 5693 . . . . . . . 8 (𝑦 = 𝑘 → (𝑓𝑦) = (𝑓𝑘))
16 fveq2 5693 . . . . . . . 8 (𝑦 = 𝑘 → (𝐹𝑦) = (𝐹𝑘))
1715, 16eqeq12d 2253 . . . . . . 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 5693 . . . . . . . 8 (𝑦 = (𝑘 + 1) → (𝑓𝑦) = (𝑓‘(𝑘 + 1)))
20 fveq2 5693 . . . . . . . 8 (𝑦 = (𝑘 + 1) → (𝐹𝑦) = (𝐹‘(𝑘 + 1)))
2119, 20eqeq12d 2253 . . . . . . 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 535 . . . . . . 7 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓‘0) = 𝐴)
248simp2d 1041 . . . . . . 7 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝐹‘0) = 𝐴)
2523, 24eqtr4d 2274 . . . . . 6 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓‘0) = (𝐹‘0))
26 fveq2 5693 . . . . . . . . . . 11 ((𝑓𝑘) = (𝐹𝑘) → ((𝐻𝑘)‘(𝑓𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
2726ad2antlr 493 . . . . . . . . . 10 (((((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) ∧ (𝑓𝑘) = (𝐹𝑘)) ∧ 𝑘 ∈ ℕ0) → ((𝐻𝑘)‘(𝑓𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
28 simplrr 542 . . . . . . . . . . 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 6102 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝑓‘(𝑛 + 1)) = (𝑓‘(𝑘 + 1)))
30 fveq2 5693 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐻𝑛) = (𝐻𝑘))
31 fveq2 5693 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝑓𝑛) = (𝑓𝑘))
3230, 31fveq12d 5700 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝑓𝑛)) = ((𝐻𝑘)‘(𝑓𝑘)))
3329, 32eqeq12d 2253 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)) ↔ (𝑓‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝑓𝑘))))
3433rspccva 2928 . . . . . . . . . . 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 1042 . . . . . . . . . . . 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 6102 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝐹‘(𝑛 + 1)) = (𝐹‘(𝑘 + 1)))
39 fveq2 5693 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐹𝑛) = (𝐹𝑘))
4030, 39fveq12d 5700 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝐹𝑛)) = ((𝐻𝑘)‘(𝐹𝑘)))
4138, 40eqeq12d 2253 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)) ↔ (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘))))
4241rspccva 2928 . . . . . . . . . . 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 2281 . . . . . . . . 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 9743 . . . . 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 5803 . . 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 2623 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 1009   = wceq 1402  wcel 2209  wral 2528  Vcvv 2821  ifcif 3638  cmpt 4190   Fn wfn 5370  wf 5371  cfv 5375  (class class class)co 6079  cmpo 6081  Xcixp 6974  0cc0 8173  1c1 8174   + caddc 8176  cmin 8491  0cn0 9546  seqcseq 10867
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4244  ax-sep 4247  ax-nul 4257  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-setind 4682  ax-iinf 4733  ax-cnex 8264  ax-resscn 8265  ax-1cn 8266  ax-1re 8267  ax-icn 8268  ax-addcl 8269  ax-addrcl 8270  ax-mulcl 8271  ax-addcom 8273  ax-addass 8275  ax-distr 8277  ax-i2m1 8278  ax-0lt1 8279  ax-0id 8281  ax-rnegex 8282  ax-cnre 8284  ax-pre-ltirr 8285  ax-pre-ltwlin 8286  ax-pre-lttrn 8287  ax-pre-ltadd 8289
This theorem depends on definitions:  df-bi 117  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-int 3969  df-iun 4012  df-br 4129  df-opab 4191  df-mpt 4192  df-tr 4228  df-id 4436  df-iord 4509  df-on 4511  df-ilim 4512  df-suc 4514  df-iom 4736  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-f1 5380  df-fo 5381  df-f1o 5382  df-fv 5383  df-riota 6032  df-ov 6082  df-oprab 6083  df-mpo 6084  df-1st 6368  df-2nd 6369  df-recs 6570  df-frec 6656  df-ixp 6975  df-pnf 8356  df-mnf 8357  df-xr 8358  df-ltxr 8359  df-le 8360  df-sub 8493  df-neg 8494  df-inn 9288  df-n0 9547  df-z 9628  df-uz 9905  df-seqfrec 10868
This theorem is referenced by:  depind  16733
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