Theorem hbtlem1 44068

Description: Value of the leading coefficient sequence function. (Contributed by Stefan O'Rear, 31-Mar-2015.)

Hypotheses

Ref	Expression
hbtlem.p	⊢ 𝑃 = (Poly1‘𝑅)
hbtlem.u	⊢ 𝑈 = (LIdeal‘𝑃)
hbtlem.s	⊢ 𝑆 = (ldgIdlSeq‘𝑅)
hbtlem.d	⊢ 𝐷 = (deg1‘𝑅)

Assertion

Ref	Expression
hbtlem1	⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑈 ∧ 𝑋 ∈ ℕ0) → ((𝑆‘𝐼)‘𝑋) = {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))})

Distinct variable groups:   𝑗,𝐼,𝑘   𝑅,𝑗,𝑘   𝑗,𝑋,𝑘

Allowed substitution hints:   𝐷(𝑗, 𝑘)   𝑃(𝑗, 𝑘)   𝑆(𝑗, 𝑘)   𝑈(𝑗, 𝑘)   𝑉(𝑗, 𝑘)

Proof of Theorem hbtlem1

Dummy variables 𝑖 𝑟 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		hbtlem.s	. . . . . 6 ⊢ 𝑆 = (ldgIdlSeq‘𝑅)
2		elex 3471	. . . . . . 7 ⊢ (𝑅 ∈ 𝑉 → 𝑅 ∈ V)
3		fveq2 6873	. . . . . . . . . . . 12 ⊢ (𝑟 = 𝑅 → (Poly1‘𝑟) = (Poly1‘𝑅))
4		hbtlem.p	. . . . . . . . . . . 12 ⊢ 𝑃 = (Poly1‘𝑅)
5	3, 4	eqtr4di 2813	. . . . . . . . . . 11 ⊢ (𝑟 = 𝑅 → (Poly1‘𝑟) = 𝑃)
6	5	fveq2d 6877	. . . . . . . . . 10 ⊢ (𝑟 = 𝑅 → (LIdeal‘(Poly1‘𝑟)) = (LIdeal‘𝑃))
7		hbtlem.u	. . . . . . . . . 10 ⊢ 𝑈 = (LIdeal‘𝑃)
8	6, 7	eqtr4di 2813	. . . . . . . . 9 ⊢ (𝑟 = 𝑅 → (LIdeal‘(Poly1‘𝑟)) = 𝑈)
9		fveq2 6873	. . . . . . . . . . . . . . . 16 ⊢ (𝑟 = 𝑅 → (deg1‘𝑟) = (deg1‘𝑅))
10		hbtlem.d	. . . . . . . . . . . . . . . 16 ⊢ 𝐷 = (deg1‘𝑅)
11	9, 10	eqtr4di 2813	. . . . . . . . . . . . . . 15 ⊢ (𝑟 = 𝑅 → (deg1‘𝑟) = 𝐷)
12	11	fveq1d 6875	. . . . . . . . . . . . . 14 ⊢ (𝑟 = 𝑅 → ((deg1‘𝑟)‘𝑘) = (𝐷‘𝑘))
13	12	breq1d 5112	. . . . . . . . . . . . 13 ⊢ (𝑟 = 𝑅 → (((deg1‘𝑟)‘𝑘) ≤ 𝑥 ↔ (𝐷‘𝑘) ≤ 𝑥))
14	13	anbi1d 643	. . . . . . . . . . . 12 ⊢ (𝑟 = 𝑅 → ((((deg1‘𝑟)‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥)) ↔ ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))))
15	14	rexbidv 3186	. . . . . . . . . . 11 ⊢ (𝑟 = 𝑅 → (∃𝑘 ∈ 𝑖 (((deg1‘𝑟)‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥)) ↔ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))))
16	15	abbidv 2826	. . . . . . . . . 10 ⊢ (𝑟 = 𝑅 → {𝑗 ∣ ∃𝑘 ∈ 𝑖 (((deg1‘𝑟)‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))} = {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})
17	16	mpteq2dv 5198	. . . . . . . . 9 ⊢ (𝑟 = 𝑅 → (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 (((deg1‘𝑟)‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}) = (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))
18	8, 17	mpteq12dv 5191	. . . . . . . 8 ⊢ (𝑟 = 𝑅 → (𝑖 ∈ (LIdeal‘(Poly1‘𝑟)) ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 (((deg1‘𝑟)‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})) = (𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})))
19		df-ldgis 44067	. . . . . . . 8 ⊢ ldgIdlSeq = (𝑟 ∈ V ↦ (𝑖 ∈ (LIdeal‘(Poly1‘𝑟)) ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 (((deg1‘𝑟)‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})))
20	18, 19, 7	mptfvmpt 7222	. . . . . . 7 ⊢ (𝑅 ∈ V → (ldgIdlSeq‘𝑅) = (𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})))
21	2, 20	syl 18	. . . . . 6 ⊢ (𝑅 ∈ 𝑉 → (ldgIdlSeq‘𝑅) = (𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})))
22	1, 21	eqtrid 2807	. . . . 5 ⊢ (𝑅 ∈ 𝑉 → 𝑆 = (𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})))
23	22	fveq1d 6875	. . . 4 ⊢ (𝑅 ∈ 𝑉 → (𝑆‘𝐼) = ((𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))‘𝐼))
24	23	fveq1d 6875	. . 3 ⊢ (𝑅 ∈ 𝑉 → ((𝑆‘𝐼)‘𝑋) = (((𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))‘𝐼)‘𝑋))
25	24	3ad2ant1 1151	. 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑈 ∧ 𝑋 ∈ ℕ0) → ((𝑆‘𝐼)‘𝑋) = (((𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))‘𝐼)‘𝑋))
26		rexeq 3315	. . . . . . 7 ⊢ (𝑖 = 𝐼 → (∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥)) ↔ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))))
27	26	abbidv 2826	. . . . . 6 ⊢ (𝑖 = 𝐼 → {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))} = {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})
28	27	mpteq2dv 5198	. . . . 5 ⊢ (𝑖 = 𝐼 → (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}) = (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))
29		eqid 2760	. . . . 5 ⊢ (𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})) = (𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))
30		nn0ex 12581	. . . . . 6 ⊢ ℕ0 ∈ V
31	30	mptex 7217	. . . . 5 ⊢ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}) ∈ V
32	28, 29, 31	fvmpt 6981	. . . 4 ⊢ (𝐼 ∈ 𝑈 → ((𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))‘𝐼) = (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))
33	32	fveq1d 6875	. . 3 ⊢ (𝐼 ∈ 𝑈 → (((𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))‘𝐼)‘𝑋) = ((𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})‘𝑋))
34	33	3ad2ant2 1152	. 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑈 ∧ 𝑋 ∈ ℕ0) → (((𝑖 ∈ 𝑈 ↦ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝑖 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}))‘𝐼)‘𝑋) = ((𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})‘𝑋))
35		eqid 2760	. . 3 ⊢ (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))}) = (𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})
36		breq2 5106	. . . . . 6 ⊢ (𝑥 = 𝑋 → ((𝐷‘𝑘) ≤ 𝑥 ↔ (𝐷‘𝑘) ≤ 𝑋))
37		fveq2 6873	. . . . . . 7 ⊢ (𝑥 = 𝑋 → ((coe1‘𝑘)‘𝑥) = ((coe1‘𝑘)‘𝑋))
38	37	eqeq2d 2771	. . . . . 6 ⊢ (𝑥 = 𝑋 → (𝑗 = ((coe1‘𝑘)‘𝑥) ↔ 𝑗 = ((coe1‘𝑘)‘𝑋)))
39	36, 38	anbi12d 644	. . . . 5 ⊢ (𝑥 = 𝑋 → (((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥)) ↔ ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))))
40	39	rexbidv 3186	. . . 4 ⊢ (𝑥 = 𝑋 → (∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥)) ↔ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))))
41	40	abbidv 2826	. . 3 ⊢ (𝑥 = 𝑋 → {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))} = {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))})
42		simp3 1156	. . 3 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑈 ∧ 𝑋 ∈ ℕ0) → 𝑋 ∈ ℕ0)
43		simpr 490	. . . . . 6 ⊢ (((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋)) → 𝑗 = ((coe1‘𝑘)‘𝑋))
44	43	reximi 3100	. . . . 5 ⊢ (∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋)) → ∃𝑘 ∈ 𝐼 𝑗 = ((coe1‘𝑘)‘𝑋))
45	44	ss2abi 4013	. . . 4 ⊢ {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))} ⊆ {𝑗 ∣ ∃𝑘 ∈ 𝐼 𝑗 = ((coe1‘𝑘)‘𝑋)}
46		abrexexg 7956	. . . . 5 ⊢ (𝐼 ∈ 𝑈 → {𝑗 ∣ ∃𝑘 ∈ 𝐼 𝑗 = ((coe1‘𝑘)‘𝑋)} ∈ V)
47	46	3ad2ant2 1152	. . . 4 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑈 ∧ 𝑋 ∈ ℕ0) → {𝑗 ∣ ∃𝑘 ∈ 𝐼 𝑗 = ((coe1‘𝑘)‘𝑋)} ∈ V)
48		ssexg 5280	. . . 4 ⊢ (({𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))} ⊆ {𝑗 ∣ ∃𝑘 ∈ 𝐼 𝑗 = ((coe1‘𝑘)‘𝑋)} ∧ {𝑗 ∣ ∃𝑘 ∈ 𝐼 𝑗 = ((coe1‘𝑘)‘𝑋)} ∈ V) → {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))} ∈ V)
49	45, 47, 48	sylancr 599	. . 3 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑈 ∧ 𝑋 ∈ ℕ0) → {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))} ∈ V)
50	35, 41, 42, 49	fvmptd3 7005	. 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑈 ∧ 𝑋 ∈ ℕ0) → ((𝑥 ∈ ℕ0 ↦ {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑥 ∧ 𝑗 = ((coe1‘𝑘)‘𝑥))})‘𝑋) = {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))})
51	25, 34, 50	3eqtrd 2799	1 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑈 ∧ 𝑋 ∈ ℕ0) → ((𝑆‘𝐼)‘𝑋) = {𝑗 ∣ ∃𝑘 ∈ 𝐼 ((𝐷‘𝑘) ≤ 𝑋 ∧ 𝑗 = ((coe1‘𝑘)‘𝑋))})

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∧ w3a 1103   = wceq 1570   ∈ wcel 2145  {cab 2738  ∃wrex 3086  Vcvv 3450   ⊆ wss 3898   class class class wbr 5102   ↦ cmpt 5185  ‘cfv 6527   ≤ cle 11315  ℕ₀cn0 12575  LIdealclidl 21445  Poly₁cpl1 22456  coe₁cco1 22457  deg₁cdg1 26333  ldgIdlSeqcldgis 44066

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pr 5390  ax-un 7734  ax-cnex 11227  ax-1cn 11229  ax-addcl 11231

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-pss 3918  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-tr 5212  df-id 5542  df-eprel 5547  df-po 5555  df-so 5556  df-fr 5600  df-we 5602  df-xp 5653  df-rel 5654  df-cnv 5655  df-co 5656  df-dm 5657  df-rn 5658  df-res 5659  df-ima 5660  df-pred 6293  df-ord 6354  df-on 6355  df-lim 6356  df-suc 6357  df-iota 6483  df-fun 6529  df-fn 6530  df-f 6531  df-f1 6532  df-fo 6533  df-f1o 6534  df-fv 6535  df-ov 7411  df-om 7861  df-2nd 7985  df-frecs 8277  df-wrecs 8308  df-recs 8357  df-rdg 8396  df-nn 12305  df-n0 12576  df-ldgis 44067

This theorem is used by:  hbtlem2  44069  hbtlem4  44071  hbtlem3  44072  hbtlem5  44073  hbtlem6  44074