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Theorem depindlem1 16730
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
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 9940 . . . 4 0 = (ℤ‘0)
2 0zd 9639 . . . 4 (𝜑 → 0 ∈ ℤ)
3 nn0ex 9552 . . . . . . 7 0 ∈ V
43mptex 5937 . . . . . 6 (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))) ∈ V
5 vex 2824 . . . . . 6 𝑦 ∈ V
64, 5fvex 5713 . . . . 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 2238 . . . . . 6 (𝑥 ∈ V, ∈ V ↦ (𝑥)) = (𝑥 ∈ V, ∈ V ↦ (𝑥))
9 vex 2824 . . . . . . 7 ∈ V
10 vex 2824 . . . . . . 7 𝑥 ∈ V
119, 10fvex 5713 . . . . . 6 (𝑥) ∈ V
12 vex 2824 . . . . . 6 𝑧 ∈ V
138, 11, 5, 12mpofvexi 6436 . . . . 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 10884 . . 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 5524 . . 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 5694 . . . 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 10882 . . . 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 2283 . . 3 (𝜑 → (𝐹‘0) = ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘0))
23 0nn0 9561 . . . 4 0 ∈ ℕ0
24 depind.0 . . . 4 (𝜑𝐴 ∈ (𝑃‘0))
25 iftrue 3645 . . . . 5 (𝑚 = 0 → if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))) = 𝐴)
26 eqid 2238 . . . . 5 (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))) = (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))
2725, 26fvmptg 5778 . . . 4 ((0 ∈ ℕ0𝐴 ∈ (𝑃‘0)) → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘0) = 𝐴)
2823, 24, 27sylancr 418 . . 3 (𝜑 → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘0) = 𝐴)
2922, 28eqtrd 2271 . 2 (𝜑 → (𝐹‘0) = 𝐴)
30 simpr 110 . . . . . . . . 9 ((𝜑𝑘 ∈ ℕ0) → 𝑘 ∈ ℕ0)
3130, 1eleqtrdi 2331 . . . . . . . 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 10885 . . . . . . 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 5694 . . . . . . 7 (𝐹‘(𝑘 + 1)) = (seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))‘(𝑘 + 1))
3616fveq1i 5694 . . . . . . . 8 (𝐹𝑘) = (seq0((𝑥 ∈ V, ∈ V ↦ (𝑥)), (𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1)))))‘𝑘)
3736oveq1i 6089 . . . . . . 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 2296 . . . . . 6 ((𝜑𝑘 ∈ ℕ0) → (𝐹‘(𝑘 + 1)) = ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘(𝑘 + 1))))
39 eqeq1 2245 . . . . . . . . . 10 (𝑚 = (𝑘 + 1) → (𝑚 = 0 ↔ (𝑘 + 1) = 0))
40 fvoveq1 6102 . . . . . . . . . 10 (𝑚 = (𝑘 + 1) → (𝐻‘(𝑚 − 1)) = (𝐻‘((𝑘 + 1) − 1)))
4139, 40ifbieq2d 3665 . . . . . . . . 9 (𝑚 = (𝑘 + 1) → if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))) = if((𝑘 + 1) = 0, 𝐴, (𝐻‘((𝑘 + 1) − 1))))
42 nn0p1nn 9585 . . . . . . . . . . 11 (𝑘 ∈ ℕ0 → (𝑘 + 1) ∈ ℕ)
4342adantl 277 . . . . . . . . . 10 ((𝜑𝑘 ∈ ℕ0) → (𝑘 + 1) ∈ ℕ)
4443nnnn0d 9603 . . . . . . . . 9 ((𝜑𝑘 ∈ ℕ0) → (𝑘 + 1) ∈ ℕ0)
4543nnne0d 9332 . . . . . . . . . . . . 13 ((𝜑𝑘 ∈ ℕ0) → (𝑘 + 1) ≠ 0)
4645neneqd 2441 . . . . . . . . . . . 12 ((𝜑𝑘 ∈ ℕ0) → ¬ (𝑘 + 1) = 0)
4746iffalsed 3650 . . . . . . . . . . 11 ((𝜑𝑘 ∈ ℕ0) → if((𝑘 + 1) = 0, 𝐴, (𝐻‘((𝑘 + 1) − 1))) = (𝐻‘((𝑘 + 1) − 1)))
4830nn0cnd 9605 . . . . . . . . . . . . 13 ((𝜑𝑘 ∈ ℕ0) → 𝑘 ∈ ℂ)
49 pncan1 8698 . . . . . . . . . . . . 13 (𝑘 ∈ ℂ → ((𝑘 + 1) − 1) = 𝑘)
5048, 49syl 14 . . . . . . . . . . . 12 ((𝜑𝑘 ∈ ℕ0) → ((𝑘 + 1) − 1) = 𝑘)
5150fveq2d 5697 . . . . . . . . . . 11 ((𝜑𝑘 ∈ ℕ0) → (𝐻‘((𝑘 + 1) − 1)) = (𝐻𝑘))
5247, 51eqtrd 2271 . . . . . . . . . 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 5693 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝐻𝑛) = (𝐻𝑘))
55 fveq2 5693 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝑃𝑛) = (𝑃𝑘))
56 fvoveq1 6102 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → (𝑃‘(𝑛 + 1)) = (𝑃‘(𝑘 + 1)))
5754, 55, 56feq123d 5522 . . . . . . . . . . . . 13 (𝑛 = 𝑘 → ((𝐻𝑛):(𝑃𝑛)⟶(𝑃‘(𝑛 + 1)) ↔ (𝐻𝑘):(𝑃𝑘)⟶(𝑃‘(𝑘 + 1))))
5857rspccva 2928 . . . . . . . . . . . 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 5837 . . . . . . . . . . 11 ((𝜑𝑘 ∈ ℕ0) → (𝑃𝑘) ∈ V)
6259, 61fexd 5942 . . . . . . . . . 10 ((𝜑𝑘 ∈ ℕ0) → (𝐻𝑘) ∈ V)
6352, 62eqeltrd 2315 . . . . . . . . 9 ((𝜑𝑘 ∈ ℕ0) → if((𝑘 + 1) = 0, 𝐴, (𝐻‘((𝑘 + 1) − 1))) ∈ V)
6426, 41, 44, 63fvmptd3 5796 . . . . . . . 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 2271 . . . . . . 7 ((𝜑𝑘 ∈ ℕ0) → ((𝑚 ∈ ℕ0 ↦ if(𝑚 = 0, 𝐴, (𝐻‘(𝑚 − 1))))‘(𝑘 + 1)) = (𝐻𝑘))
6665oveq2d 6095 . . . . . 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 2271 . . . . 5 ((𝜑𝑘 ∈ ℕ0) → (𝐹‘(𝑘 + 1)) = ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))(𝐻𝑘)))
6818ffvelcdmda 5837 . . . . . 6 ((𝜑𝑘 ∈ ℕ0) → (𝐹𝑘) ∈ V)
69 fvexg 5712 . . . . . . 7 (((𝐻𝑘) ∈ V ∧ (𝐹𝑘) ∈ V) → ((𝐻𝑘)‘(𝐹𝑘)) ∈ V)
7062, 68, 69syl2anc 415 . . . . . 6 ((𝜑𝑘 ∈ ℕ0) → ((𝐻𝑘)‘(𝐹𝑘)) ∈ V)
71 fveq2 5693 . . . . . . 7 (𝑦 = (𝐹𝑘) → (𝑧𝑦) = (𝑧‘(𝐹𝑘)))
72 fveq1 5692 . . . . . . 7 (𝑧 = (𝐻𝑘) → (𝑧‘(𝐹𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
73 fveq2 5693 . . . . . . . 8 (𝑥 = 𝑦 → (𝑥) = (𝑦))
74 fveq1 5692 . . . . . . . 8 ( = 𝑧 → (𝑦) = (𝑧𝑦))
7573, 74cbvmpov 6162 . . . . . . 7 (𝑥 ∈ V, ∈ V ↦ (𝑥)) = (𝑦 ∈ V, 𝑧 ∈ V ↦ (𝑧𝑦))
7671, 72, 75ovmpog 6217 . . . . . 6 (((𝐹𝑘) ∈ V ∧ (𝐻𝑘) ∈ V ∧ ((𝐻𝑘)‘(𝐹𝑘)) ∈ V) → ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))(𝐻𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
7768, 62, 70, 76syl3anc 1278 . . . . 5 ((𝜑𝑘 ∈ ℕ0) → ((𝐹𝑘)(𝑥 ∈ V, ∈ V ↦ (𝑥))(𝐻𝑘)) = ((𝐻𝑘)‘(𝐹𝑘)))
7867, 77eqtrd 2271 . . . 4 ((𝜑𝑘 ∈ ℕ0) → (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘)))
7978ralrimiva 2623 . . 3 (𝜑 → ∀𝑘 ∈ ℕ0 (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘)))
80 fvoveq1 6102 . . . . 5 (𝑛 = 𝑘 → (𝐹‘(𝑛 + 1)) = (𝐹‘(𝑘 + 1)))
81 fveq2 5693 . . . . . 6 (𝑛 = 𝑘 → (𝐹𝑛) = (𝐹𝑘))
8254, 81fveq12d 5700 . . . . 5 (𝑛 = 𝑘 → ((𝐻𝑛)‘(𝐹𝑛)) = ((𝐻𝑘)‘(𝐹𝑘)))
8380, 82eqeq12d 2253 . . . 4 (𝑛 = 𝑘 → ((𝐹‘(𝑛 + 1)) = ((𝐻𝑛)‘(𝐹𝑛)) ↔ (𝐹‘(𝑘 + 1)) = ((𝐻𝑘)‘(𝐹𝑘))))
8483cbvralvw 2790 . . 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 1208 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 1009   = wceq 1402  wcel 2209  wral 2528  Vcvv 2821  ifcif 3638  cmpt 4190  wf 5371  cfv 5375  (class class class)co 6079  cmpo 6081  cc 8171  0cc0 8173  1c1 8174   + caddc 8176  cmin 8491  cn 9287  0cn0 9546  cuz 9904  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-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:  depindlem2  16731  depindlem3  16732  depind  16733
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