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Theorem depindlem1 16386
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
depindlem1 (𝜑 → (𝐹:ℕ0⟶V ∧ (𝐹‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛))))
Distinct variable groups:   ,𝑛,𝑥   𝐴,𝑚,𝑛   𝑛,𝐹   𝑚,𝐻,𝑛   𝑃,𝑛
Allowed substitution hints:   𝜑(𝑥,,𝑚,𝑛)   𝐴(𝑥,)   𝑃(𝑥,,𝑚)   𝐹(𝑥,,𝑚)   𝐻(𝑥,)

Proof of Theorem depindlem1
Dummy variables 𝑦 𝑧 𝑘 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 nn0uz 9796 . . . 4 0 = (ℤ‘0)
2 0zd 9496 . . . 4 (𝜑 → 0 ∈ ℤ)
3 nn0ex 9413 . . . . . . 7 0 ∈ V
43mptex 5885 . . . . . 6 (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))) ∈ V
5 vex 2804 . . . . . 6 𝑦 ∈ V
64, 5fvex 5662 . . . . 5 ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘𝑦) ∈ V
76a1i 9 . . . 4 ((𝜑𝑦 ∈ ℕ0) → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘𝑦) ∈ V)
8 eqid 2230 . . . . . 6 (𝑥 ∈ V, ∈ V ↦ (𝑥)) = (𝑥 ∈ V, ∈ V ↦ (𝑥))
9 vex 2804 . . . . . . 7 ∈ V
10 vex 2804 . . . . . . 7 𝑥 ∈ V
119, 10fvex 5662 . . . . . 6 (𝑥) ∈ V
12 vex 2804 . . . . . 6 𝑧 ∈ V
138, 11, 5, 12mpofvexi 6376 . . . . 5 (𝑦(𝑥 ∈ V, ∈ V ↦ (𝑥))𝑧) ∈ V
1413a1i 9 . . . 4 ((𝜑 ∧ (𝑦 ∈ V ∧ 𝑧 ∈ V)) → (𝑦(𝑥 ∈ V, ∈ V ↦ (𝑥))𝑧) ∈ V)
151, 2, 7, 14seqf 10732 . . 3 (𝜑 → seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))):ℕ0⟶V)
16 depindlem1.4 . . . 4 𝐹 = seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))
1716feq1i 5477 . . 3 (𝐹:ℕ0⟶V ↔ seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))):ℕ0⟶V)
1815, 17sylibr 134 . 2 (𝜑𝐹:ℕ0⟶V)
1916fveq1i 5643 . . . 4 (𝐹‘0) = (seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))‘0)
206a1i 9 . . . . 5 ((𝜑𝑦 ∈ (ℤ‘0)) → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘𝑦) ∈ V)
212, 20, 14seq3-1 10730 . . . 4 (𝜑 → (seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))‘0) = ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘0))
2219, 21eqtrid 2275 . . 3 (𝜑 → (𝐹‘0) = ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘0))
23 0nn0 9422 . . . 4 0 ∈ ℕ0
24 depind.0 . . . 4 (𝜑𝐴 ∈ (𝑃‘0))
25 iftrue 3611 . . . . 5 (𝑚 = 0 → if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))) = 𝐴)
26 eqid 2230 . . . . 5 (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))) = (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))
2725, 26fvmptg 5725 . . . 4 ((0 ∈ ℕ0𝐴 ∈ (𝑃‘0)) → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘0) = 𝐴)
2823, 24, 27sylancr 414 . . 3 (𝜑 → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘0) = 𝐴)
2922, 28eqtrd 2263 . 2 (𝜑 → (𝐹‘0) = 𝐴)
30 simpr 110 . . . . . . . . 9 ((𝜑𝑘 ∈ ℕ0) → 𝑘 ∈ ℕ0)
3130, 1eleqtrdi 2323 . . . . . . . 8 ((𝜑𝑘 ∈ ℕ0) → 𝑘 ∈ (ℤ‘0))
326a1i 9 . . . . . . . 8 (((𝜑𝑘 ∈ ℕ0) ∧ 𝑦 ∈ (ℤ‘0)) → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘𝑦) ∈ V)
3313a1i 9 . . . . . . . 8 (((𝜑𝑘 ∈ ℕ0) ∧ (𝑦 ∈ V ∧ 𝑧 ∈ V)) → (𝑦(𝑥 ∈ V, ∈ V ↦ (𝑥))𝑧) ∈ V)
3431, 32, 33seq3p1 10733 . . . . . . 7 ((𝜑𝑘 ∈ ℕ0) → (seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))‘(𝑘 + 1)) = ((seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))‘𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘(𝑘 + 1))))
3516fveq1i 5643 . . . . . . 7 (𝐹‘(𝑘 + 1)) = (seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))‘(𝑘 + 1))
3616fveq1i 5643 . . . . . . . 8 (𝐹𝑘) = (seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))‘𝑘)
3736oveq1i 6033 . . . . . . 7 ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘(𝑘 + 1))) = ((seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))‘𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘(𝑘 + 1)))
3834, 35, 373eqtr4g 2288 . . . . . 6 ((𝜑𝑘 ∈ ℕ0) → (𝐹‘(𝑘 + 1)) = ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘(𝑘 + 1))))
39 eqeq1 2237 . . . . . . . . . 10 (𝑚 = (𝑘 + 1) → (𝑚 = 0 ↔ (𝑘 + 1) = 0))
40 fvoveq1 6046 . . . . . . . . . 10 (𝑚 = (𝑘 + 1) → (𝐻‘(𝑚 − 1)) = (𝐻‘((𝑘 + 1) − 1)))
4139, 40ifbieq2d 3631 . . . . . . . . 9 (𝑚 = (𝑘 + 1) → if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))) = if((𝑘 + 1) = 0, 𝐴, (𝐻‘((𝑘 + 1) − 1))))
42 nn0p1nn 9446 . . . . . . . . . . 11 (𝑘 ∈ ℕ0 → (𝑘 + 1) ∈ ℕ)
4342adantl 277 . . . . . . . . . 10 ((𝜑𝑘 ∈ ℕ0) → (𝑘 + 1) ∈ ℕ)
4443nnnn0d 9460 . . . . . . . . 9 ((𝜑𝑘 ∈ ℕ0) → (𝑘 + 1) ∈ ℕ0)
4543nnne0d 9193 . . . . . . . . . . . . 13 ((𝜑𝑘 ∈ ℕ0) → (𝑘 + 1) ≠ 0)
4645neneqd 2422 . . . . . . . . . . . 12 ((𝜑𝑘 ∈ ℕ0) → ¬ (𝑘 + 1) = 0)
4746iffalsed 3616 . . . . . . . . . . 11 ((𝜑𝑘 ∈ ℕ0) → if((𝑘 + 1) = 0, 𝐴, (𝐻‘((𝑘 + 1) − 1))) = (𝐻‘((𝑘 + 1) − 1)))
4830nn0cnd 9462 . . . . . . . . . . . . 13 ((𝜑𝑘 ∈ ℕ0) → 𝑘 ∈ ℂ)
49 pncan1 8561 . . . . . . . . . . . . 13 (𝑘 ∈ ℂ → ((𝑘 + 1) − 1) = 𝑘)
5048, 49syl 14 . . . . . . . . . . . 12 ((𝜑𝑘 ∈ ℕ0) → ((𝑘 + 1) − 1) = 𝑘)
5150fveq2d 5646 . . . . . . . . . . 11 ((𝜑𝑘 ∈ ℕ0) → (𝐻‘((𝑘 + 1) − 1)) = (𝐻𝑘))
5247, 51eqtrd 2263 . . . . . . . . . 10 ((𝜑𝑘 ∈ ℕ0) → if((𝑘 + 1) = 0, 𝐴, (𝐻‘((𝑘 + 1) − 1))) = (𝐻𝑘))
53 depind.h . . . . . . . . . . . 12 (𝜑 → ∀𝑛 ∈ ℕ0 (𝐻𝑛):(𝑃𝑛)⟶(𝑃‘(𝑛 + 1)))
54 fveq2 5642 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐻𝑛) = (𝐻𝑘))
55 fveq2 5642 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝑃𝑛) = (𝑃𝑘))
56 fvoveq1 6046 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝑃‘(𝑛 + 1)) = (𝑃‘(𝑘 + 1)))
5754, 55, 56feq123d 5475 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛):(𝑃𝑛)⟶(𝑃‘(𝑛 + 1)) ↔ (𝐻𝑘):(𝑃𝑘)⟶(𝑃‘(𝑘 + 1))))
5857rspccva 2908 . . . . . . . . . . . 12 ((∀𝑛 ∈ ℕ0 (𝐻𝑛):(𝑃𝑛)⟶(𝑃‘(𝑛 + 1)) ∧ 𝑘 ∈ ℕ0) → (𝐻𝑘):(𝑃𝑘)⟶(𝑃‘(𝑘 + 1)))
5953, 58sylan 283 . . . . . . . . . . 11 ((𝜑𝑘 ∈ ℕ0) → (𝐻𝑘):(𝑃𝑘)⟶(𝑃‘(𝑘 + 1)))
60 depind.p . . . . . . . . . . . 12 (𝜑𝑃:ℕ0⟶V)
6160ffvelcdmda 5785 . . . . . . . . . . 11 ((𝜑𝑘 ∈ ℕ0) → (𝑃𝑘) ∈ V)
6259, 61fexd 5889 . . . . . . . . . 10 ((𝜑𝑘 ∈ ℕ0) → (𝐻𝑘) ∈ V)
6352, 62eqeltrd 2307 . . . . . . . . 9 ((𝜑𝑘 ∈ ℕ0) → if((𝑘 + 1) = 0, 𝐴, (𝐻‘((𝑘 + 1) − 1))) ∈ V)
6426, 41, 44, 63fvmptd3 5743 . . . . . . . 8 ((𝜑𝑘 ∈ ℕ0) → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘(𝑘 + 1)) = if((𝑘 + 1) = 0, 𝐴, (𝐻‘((𝑘 + 1) − 1))))
6564, 52eqtrd 2263 . . . . . . 7 ((𝜑𝑘 ∈ ℕ0) → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘(𝑘 + 1)) = (𝐻𝑘))
6665oveq2d 6039 . . . . . 6 ((𝜑𝑘 ∈ ℕ0) → ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘(𝑘 + 1))) = ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))(𝐻𝑘)))
6738, 66eqtrd 2263 . . . . 5 ((𝜑𝑘 ∈ ℕ0) → (𝐹‘(𝑘 + 1)) = ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))(𝐻𝑘)))
6818ffvelcdmda 5785 . . . . . 6 ((𝜑𝑘 ∈ ℕ0) → (𝐹𝑘) ∈ V)
69 fvexg 5661 . . . . . . 7 (((𝐻𝑘) ∈ V ∧ (𝐹𝑘) ∈ V) → ((𝐻𝑘)‘(𝐹𝑘)) ∈ V)
7062, 68, 69syl2anc 411 . . . . . 6 ((𝜑𝑘 ∈ ℕ0) → ((𝐻𝑘)‘(𝐹𝑘)) ∈ V)
71 fveq2 5642 . . . . . . 7 (𝑦 = (𝐹𝑘) → (𝑧𝑦) = (𝑧‘(𝐹𝑘)))
72 fveq1 5641 . . . . . . 7 (𝑧 = (𝐻𝑘) → (𝑧‘(𝐹𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
73 fveq2 5642 . . . . . . . 8 (𝑥 = 𝑦 → (𝑥) = (𝑦))
74 fveq1 5641 . . . . . . . 8 ( = 𝑧 → (𝑦) = (𝑧𝑦))
7573, 74cbvmpov 6106 . . . . . . 7 (𝑥 ∈ V, ∈ V ↦ (𝑥)) = (𝑦 ∈ V, 𝑧 ∈ V ↦ (𝑧𝑦))
7671, 72, 75ovmpog 6161 . . . . . 6 (((𝐹𝑘) ∈ V ∧ (𝐻𝑘) ∈ V ∧ ((𝐻𝑘)‘(𝐹𝑘)) ∈ V) → ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))(𝐻𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
7768, 62, 70, 76syl3anc 1273 . . . . 5 ((𝜑𝑘 ∈ ℕ0) → ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))(𝐻𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
7867, 77eqtrd 2263 . . . 4 ((𝜑𝑘 ∈ ℕ0) → (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘)))
7978ralrimiva 2604 . . 3 (𝜑 → ∀𝑘 ∈ ℕ0 (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘)))
80 fvoveq1 6046 . . . . 5 (𝑛 = 𝑘 → (𝐹‘(𝑛 + 1)) = (𝐹‘(𝑘 + 1)))
81 fveq2 5642 . . . . . 6 (𝑛 = 𝑘 → (𝐹𝑛) = (𝐹𝑘))
8254, 81fveq12d 5649 . . . . 5 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝐹𝑛)) = ((𝐻𝑘)‘(𝐹𝑘)))
8380, 82eqeq12d 2245 . . . 4 (𝑛 = 𝑘 → ((𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)) ↔ (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘))))
8483cbvralvw 2770 . . 3 (∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)) ↔ ∀𝑘 ∈ ℕ0 (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘)))
8579, 84sylibr 134 . 2 (𝜑 → ∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)))
8618, 29, 853jca 1203 1 (𝜑 → (𝐹:ℕ0⟶V ∧ (𝐹‘0) = 𝐴 ∧ ∀𝑛 ∈ ℕ0 (𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛))))
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  wf 5324  cfv 5328  (class class class)co 6023  cmpo 6025  cc 8035  0cc0 8037  1c1 8038   + caddc 8040  cmin 8355  cn 9148  0cn0 9407  cuz 9760  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-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:  depindlem2  16387  depindlem3  16388  depind  16389
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