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Theorem depindlem3 16490
Description: Lemma for depind 16491. (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 6938 . . . . 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 16488 . . . . . . 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 5508 . . . 4 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝐹 Fn ℕ0)
11 fveq2 5669 . . . . . . . 8 (𝑦 = 0 → (𝑓𝑦) = (𝑓‘0))
12 fveq2 5669 . . . . . . . 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 5669 . . . . . . . 8 (𝑦 = 𝑘 → (𝑓𝑦) = (𝑓𝑘))
16 fveq2 5669 . . . . . . . 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 5669 . . . . . . . 8 (𝑦 = (𝑘 + 1) → (𝑓𝑦) = (𝑓‘(𝑘 + 1)))
20 fveq2 5669 . . . . . . . 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 5669 . . . . . . . . . . 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 6072 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝑓‘(𝑛 + 1)) = (𝑓‘(𝑘 + 1)))
30 fveq2 5669 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐻𝑛) = (𝐻𝑘))
31 fveq2 5669 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝑓𝑛) = (𝑓𝑘))
3230, 31fveq12d 5676 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝑓𝑛)) = ((𝐻𝑘)‘(𝑓𝑘)))
3329, 32eqeq12d 2247 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)) ↔ (𝑓‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝑓𝑘))))
3433rspccva 2919 . . . . . . . . . . 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 6072 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝐹‘(𝑛 + 1)) = (𝐹‘(𝑘 + 1)))
39 fveq2 5669 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐹𝑛) = (𝐹𝑘))
4030, 39fveq12d 5676 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝐹𝑛)) = ((𝐻𝑘)‘(𝐹𝑘)))
4138, 40eqeq12d 2247 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)) ↔ (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘))))
4241rspccva 2919 . . . . . . . . . . 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 9688 . . . . 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 5777 . . 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 2812  ifcif 3619  cmpt 4170   Fn wfn 5346  wf 5347  cfv 5351  (class class class)co 6049  cmpo 6051  Xcixp 6932  0cc0 8123  1c1 8124   + caddc 8126  cmin 8440  0cn0 9492  seqcseq 10805
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 4224  ax-sep 4227  ax-nul 4235  ax-pow 4286  ax-pr 4321  ax-un 4553  ax-setind 4658  ax-iinf 4709  ax-cnex 8214  ax-resscn 8215  ax-1cn 8216  ax-1re 8217  ax-icn 8218  ax-addcl 8219  ax-addrcl 8220  ax-mulcl 8221  ax-addcom 8223  ax-addass 8225  ax-distr 8227  ax-i2m1 8228  ax-0lt1 8229  ax-0id 8231  ax-rnegex 8232  ax-cnre 8234  ax-pre-ltirr 8235  ax-pre-ltwlin 8236  ax-pre-lttrn 8237  ax-pre-ltadd 8239
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 2814  df-sbc 3042  df-csb 3138  df-dif 3212  df-un 3214  df-in 3216  df-ss 3223  df-nul 3508  df-if 3620  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-uni 3914  df-int 3949  df-iun 3992  df-br 4109  df-opab 4171  df-mpt 4172  df-tr 4208  df-id 4413  df-iord 4486  df-on 4488  df-ilim 4489  df-suc 4491  df-iom 4712  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-rn 4759  df-res 4760  df-ima 4761  df-iota 5311  df-fun 5353  df-fn 5354  df-f 5355  df-f1 5356  df-fo 5357  df-f1o 5358  df-fv 5359  df-riota 6002  df-ov 6052  df-oprab 6053  df-mpo 6054  df-1st 6333  df-2nd 6334  df-recs 6535  df-frec 6621  df-ixp 6933  df-pnf 8306  df-mnf 8307  df-xr 8308  df-ltxr 8309  df-le 8310  df-sub 8442  df-neg 8443  df-inn 9234  df-n0 9493  df-z 9574  df-uz 9850  df-seqfrec 10806
This theorem is referenced by:  depind  16491
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