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Theorem depindlem3 16503
Description: Lemma for depind 16504. (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 6939 . . . . 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 16501 . . . . . . 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 1036 . . . . 5 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝐹:ℕ0⟶V)
109ffnd 5509 . . . 4 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝐹 Fn ℕ0)
11 fveq2 5670 . . . . . . . 8 (𝑦 = 0 → (𝑓𝑦) = (𝑓‘0))
12 fveq2 5670 . . . . . . . 8 (𝑦 = 0 → (𝐹𝑦) = (𝐹‘0))
1311, 12eqeq12d 2247 . . . . . . 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 5670 . . . . . . . 8 (𝑦 = 𝑘 → (𝑓𝑦) = (𝑓𝑘))
16 fveq2 5670 . . . . . . . 8 (𝑦 = 𝑘 → (𝐹𝑦) = (𝐹𝑘))
1715, 16eqeq12d 2247 . . . . . . 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 5670 . . . . . . . 8 (𝑦 = (𝑘 + 1) → (𝑓𝑦) = (𝑓‘(𝑘 + 1)))
20 fveq2 5670 . . . . . . . 8 (𝑦 = (𝑘 + 1) → (𝐹𝑦) = (𝐹‘(𝑘 + 1)))
2119, 20eqeq12d 2247 . . . . . . 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 1037 . . . . . . 7 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝐹‘0) = 𝐴)
2523, 24eqtr4d 2268 . . . . . 6 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓‘0) = (𝐹‘0))
26 fveq2 5670 . . . . . . . . . . 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 6073 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝑓‘(𝑛 + 1)) = (𝑓‘(𝑘 + 1)))
30 fveq2 5670 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐻𝑛) = (𝐻𝑘))
31 fveq2 5670 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝑓𝑛) = (𝑓𝑘))
3230, 31fveq12d 5677 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝑓𝑛)) = ((𝐻𝑘)‘(𝑓𝑘)))
3329, 32eqeq12d 2247 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)) ↔ (𝑓‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝑓𝑘))))
3433rspccva 2920 . . . . . . . . . . 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 1038 . . . . . . . . . . . 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 6073 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝐹‘(𝑛 + 1)) = (𝐹‘(𝑘 + 1)))
39 fveq2 5670 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐹𝑛) = (𝐹𝑘))
4030, 39fveq12d 5677 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝐹𝑛)) = ((𝐻𝑘)‘(𝐹𝑘)))
4138, 40eqeq12d 2247 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)) ↔ (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘))))
4241rspccva 2920 . . . . . . . . . . 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 2275 . . . . . . . . 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 9692 . . . . 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 5778 . . 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 2615 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 1005   = wceq 1398  wcel 2203  wral 2520  Vcvv 2813  ifcif 3620  cmpt 4171   Fn wfn 5347  wf 5348  cfv 5352  (class class class)co 6050  cmpo 6052  Xcixp 6933  0cc0 8127  1c1 8128   + caddc 8130  cmin 8444  0cn0 9496  seqcseq 10809
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-coll 4225  ax-sep 4228  ax-nul 4236  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-iinf 4710  ax-cnex 8218  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-icn 8222  ax-addcl 8223  ax-addrcl 8224  ax-mulcl 8225  ax-addcom 8227  ax-addass 8229  ax-distr 8231  ax-i2m1 8232  ax-0lt1 8233  ax-0id 8235  ax-rnegex 8236  ax-cnre 8238  ax-pre-ltirr 8239  ax-pre-ltwlin 8240  ax-pre-lttrn 8241  ax-pre-ltadd 8243
This theorem depends on definitions:  df-bi 117  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-nul 3509  df-if 3621  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-int 3950  df-iun 3993  df-br 4110  df-opab 4172  df-mpt 4173  df-tr 4209  df-id 4414  df-iord 4487  df-on 4489  df-ilim 4490  df-suc 4492  df-iom 4713  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-riota 6003  df-ov 6053  df-oprab 6054  df-mpo 6055  df-1st 6334  df-2nd 6335  df-recs 6536  df-frec 6622  df-ixp 6934  df-pnf 8310  df-mnf 8311  df-xr 8312  df-ltxr 8313  df-le 8314  df-sub 8446  df-neg 8447  df-inn 9238  df-n0 9497  df-z 9578  df-uz 9854  df-seqfrec 10810
This theorem is referenced by:  depind  16504
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