Users' Mathboxes Mathbox for Matthew House < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >   Mathboxes  >  depindlem3 GIF version

Theorem depindlem3 16388
Description: Lemma for depind 16389. (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 6878 . . . . 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 16386 . . . . . . 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 5485 . . . 4 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → 𝐹 Fn ℕ0)
11 fveq2 5642 . . . . . . . 8 (𝑦 = 0 → (𝑓𝑦) = (𝑓‘0))
12 fveq2 5642 . . . . . . . 8 (𝑦 = 0 → (𝐹𝑦) = (𝐹‘0))
1311, 12eqeq12d 2245 . . . . . . 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 5642 . . . . . . . 8 (𝑦 = 𝑘 → (𝑓𝑦) = (𝑓𝑘))
16 fveq2 5642 . . . . . . . 8 (𝑦 = 𝑘 → (𝐹𝑦) = (𝐹𝑘))
1715, 16eqeq12d 2245 . . . . . . 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 5642 . . . . . . . 8 (𝑦 = (𝑘 + 1) → (𝑓𝑦) = (𝑓‘(𝑘 + 1)))
20 fveq2 5642 . . . . . . . 8 (𝑦 = (𝑘 + 1) → (𝐹𝑦) = (𝐹‘(𝑘 + 1)))
2119, 20eqeq12d 2245 . . . . . . 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 2266 . . . . . 6 (((𝜑𝑓X𝑛 ∈ ℕ0 (𝑃𝑛)) ∧ ((𝑓‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)))) → (𝑓‘0) = (𝐹‘0))
26 fveq2 5642 . . . . . . . . . . 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 6046 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝑓‘(𝑛 + 1)) = (𝑓‘(𝑘 + 1)))
30 fveq2 5642 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐻𝑛) = (𝐻𝑘))
31 fveq2 5642 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝑓𝑛) = (𝑓𝑘))
3230, 31fveq12d 5649 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝑓𝑛)) = ((𝐻𝑘)‘(𝑓𝑘)))
3329, 32eqeq12d 2245 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝑓‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝑓𝑛)) ↔ (𝑓‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝑓𝑘))))
3433rspccva 2908 . . . . . . . . . . 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 6046 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → (𝐹‘(𝑛 + 1)) = (𝐹‘(𝑘 + 1)))
39 fveq2 5642 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐹𝑛) = (𝐹𝑘))
4030, 39fveq12d 5649 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝐹𝑛)) = ((𝐻𝑘)‘(𝐹𝑘)))
4138, 40eqeq12d 2245 . . . . . . . . . . . 12 (𝑛 = 𝑘 → ((𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)) ↔ (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘))))
4241rspccva 2908 . . . . . . . . . . 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 2273 . . . . . . . . 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 9599 . . . . 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 5750 . . 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 2604 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 2201  wral 2509  Vcvv 2801  ifcif 3604  cmpt 4151   Fn wfn 5323  wf 5324  cfv 5328  (class class class)co 6023  cmpo 6025  Xcixp 6872  0cc0 8037  1c1 8038   + caddc 8040  cmin 8355  0cn0 9407  seqcseq 10715
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 2203  ax-14 2204  ax-ext 2212  ax-coll 4205  ax-sep 4208  ax-nul 4216  ax-pow 4266  ax-pr 4301  ax-un 4532  ax-setind 4637  ax-iinf 4688  ax-cnex 8128  ax-resscn 8129  ax-1cn 8130  ax-1re 8131  ax-icn 8132  ax-addcl 8133  ax-addrcl 8134  ax-mulcl 8135  ax-addcom 8137  ax-addass 8139  ax-distr 8141  ax-i2m1 8142  ax-0lt1 8143  ax-0id 8145  ax-rnegex 8146  ax-cnre 8148  ax-pre-ltirr 8149  ax-pre-ltwlin 8150  ax-pre-lttrn 8151  ax-pre-ltadd 8153
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 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ne 2402  df-nel 2497  df-ral 2514  df-rex 2515  df-reu 2516  df-rab 2518  df-v 2803  df-sbc 3031  df-csb 3127  df-dif 3201  df-un 3203  df-in 3205  df-ss 3212  df-nul 3494  df-if 3605  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-int 3930  df-iun 3973  df-br 4090  df-opab 4152  df-mpt 4153  df-tr 4189  df-id 4392  df-iord 4465  df-on 4467  df-ilim 4468  df-suc 4470  df-iom 4691  df-xp 4733  df-rel 4734  df-cnv 4735  df-co 4736  df-dm 4737  df-rn 4738  df-res 4739  df-ima 4740  df-iota 5288  df-fun 5330  df-fn 5331  df-f 5332  df-f1 5333  df-fo 5334  df-f1o 5335  df-fv 5336  df-riota 5976  df-ov 6026  df-oprab 6027  df-mpo 6028  df-1st 6308  df-2nd 6309  df-recs 6476  df-frec 6562  df-ixp 6873  df-pnf 8221  df-mnf 8222  df-xr 8223  df-ltxr 8224  df-le 8225  df-sub 8357  df-neg 8358  df-inn 9149  df-n0 9408  df-z 9485  df-uz 9761  df-seqfrec 10716
This theorem is referenced by:  depind  16389
  Copyright terms: Public domain W3C validator