tdeglem4 - Metamath Proof Explorer

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Theorem tdeglem4 24351

Description: There is only one multi-index with total degree 0. (Contributed by Stefan O'Rear, 29-Mar-2015.)

**Hypotheses**
Ref	Expression
tdeglem.a	⊢ 𝐴 = {𝑚 ∈ (ℕ₀ ↑_𝑚 𝐼) ∣ (^◡𝑚 “ ℕ) ∈ Fin}
tdeglem.h	⊢ 𝐻 = (ℎ ∈ 𝐴 ↦ (ℂ_fld Σ_g ℎ))

**Assertion**
Ref	Expression
tdeglem4	⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → ((𝐻‘𝑋) = 0 ↔ 𝑋 = (𝐼 × {0})))

Distinct variable groups: 𝐴,ℎ ℎ,𝐼,𝑚 ℎ,𝑉 ℎ,𝑋,𝑚 Allowed substitution hints: 𝐴(𝑚) 𝐻(ℎ,𝑚) 𝑉(𝑚)

Proof of Theorem tdeglem4 Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		rexnal 3179	. . . . 5 ⊢ (∃𝑥 ∈ 𝐼 ¬ (𝑋‘𝑥) = 0 ↔ ¬ ∀𝑥 ∈ 𝐼 (𝑋‘𝑥) = 0)
2		df-ne 2962	. . . . . . 7 ⊢ ((𝑋‘𝑥) ≠ 0 ↔ ¬ (𝑋‘𝑥) = 0)
3		oveq2 6978	. . . . . . . . . . . 12 ⊢ (ℎ = 𝑋 → (ℂ_fld Σ_g ℎ) = (ℂ_fld Σ_g 𝑋))
4		tdeglem.h	. . . . . . . . . . . 12 ⊢ 𝐻 = (ℎ ∈ 𝐴 ↦ (ℂ_fld Σ_g ℎ))
5		ovex 7002	. . . . . . . . . . . 12 ⊢ (ℂ_fld Σ_g 𝑋) ∈ V
6	3, 4, 5	fvmpt 6589	. . . . . . . . . . 11 ⊢ (𝑋 ∈ 𝐴 → (𝐻‘𝑋) = (ℂ_fld Σ_g 𝑋))
7	6	ad2antlr 714	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝐻‘𝑋) = (ℂ_fld Σ_g 𝑋))
8		tdeglem.a	. . . . . . . . . . . . . 14 ⊢ 𝐴 = {𝑚 ∈ (ℕ₀ ↑_𝑚 𝐼) ∣ (^◡𝑚 “ ℕ) ∈ Fin}
9	8	psrbagf 19853	. . . . . . . . . . . . 13 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → 𝑋:𝐼⟶ℕ₀)
10	9	feqmptd 6556	. . . . . . . . . . . 12 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → 𝑋 = (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)))
11	10	adantr 473	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → 𝑋 = (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)))
12	11	oveq2d 6986	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (ℂ_fld Σ_g 𝑋) = (ℂ_fld Σ_g (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦))))
13		cnfldbas 20245	. . . . . . . . . . 11 ⊢ ℂ = (Base‘ℂ_fld)
14		cnfld0 20265	. . . . . . . . . . 11 ⊢ 0 = (0_g‘ℂ_fld)
15		cnfldadd 20246	. . . . . . . . . . 11 ⊢ + = (+_g‘ℂ_fld)
16		cnring 20263	. . . . . . . . . . . 12 ⊢ ℂ_fld ∈ Ring
17		ringcmn 19048	. . . . . . . . . . . 12 ⊢ (ℂ_fld ∈ Ring → ℂ_fld ∈ CMnd)
18	16, 17	mp1i 13	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → ℂ_fld ∈ CMnd)
19		simpll 754	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → 𝐼 ∈ 𝑉)
20	9	adantr 473	. . . . . . . . . . . . 13 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → 𝑋:𝐼⟶ℕ₀)
21	20	ffvelrnda 6670	. . . . . . . . . . . 12 ⊢ ((((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) ∧ 𝑦 ∈ 𝐼) → (𝑋‘𝑦) ∈ ℕ₀)
22	21	nn0cnd 11763	. . . . . . . . . . 11 ⊢ ((((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) ∧ 𝑦 ∈ 𝐼) → (𝑋‘𝑦) ∈ ℂ)
23	8	psrbagfsupp 19996	. . . . . . . . . . . . . 14 ⊢ ((𝑋 ∈ 𝐴 ∧ 𝐼 ∈ 𝑉) → 𝑋 finSupp 0)
24	23	ancoms 451	. . . . . . . . . . . . 13 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → 𝑋 finSupp 0)
25	24	adantr 473	. . . . . . . . . . . 12 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → 𝑋 finSupp 0)
26	11, 25	eqbrtrrd 4947	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) finSupp 0)
27		incom 4060	. . . . . . . . . . . . 13 ⊢ ((𝐼 ∖ {𝑥}) ∩ {𝑥}) = ({𝑥} ∩ (𝐼 ∖ {𝑥}))
28		disjdif 4298	. . . . . . . . . . . . 13 ⊢ ({𝑥} ∩ (𝐼 ∖ {𝑥})) = ∅
29	27, 28	eqtri 2796	. . . . . . . . . . . 12 ⊢ ((𝐼 ∖ {𝑥}) ∩ {𝑥}) = ∅
30	29	a1i 11	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → ((𝐼 ∖ {𝑥}) ∩ {𝑥}) = ∅)
31		difsnid 4611	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ 𝐼 → ((𝐼 ∖ {𝑥}) ∪ {𝑥}) = 𝐼)
32	31	eqcomd 2778	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ 𝐼 → 𝐼 = ((𝐼 ∖ {𝑥}) ∪ {𝑥}))
33	32	ad2antrl 715	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → 𝐼 = ((𝐼 ∖ {𝑥}) ∪ {𝑥}))
34	13, 14, 15, 18, 19, 22, 26, 30, 33	gsumsplit2 18796	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (ℂ_fld Σ_g (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦))) = ((ℂ_fld Σ_g (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))) + (ℂ_fld Σ_g (𝑦 ∈ {𝑥} ↦ (𝑋‘𝑦)))))
35	7, 12, 34	3eqtrd 2812	. . . . . . . . 9 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝐻‘𝑋) = ((ℂ_fld Σ_g (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))) + (ℂ_fld Σ_g (𝑦 ∈ {𝑥} ↦ (𝑋‘𝑦)))))
36		difexg 5081	. . . . . . . . . . . . 13 ⊢ (𝐼 ∈ 𝑉 → (𝐼 ∖ {𝑥}) ∈ V)
37	36	ad2antrr 713	. . . . . . . . . . . 12 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝐼 ∖ {𝑥}) ∈ V)
38		nn0subm 20296	. . . . . . . . . . . . 13 ⊢ ℕ₀ ∈ (SubMnd‘ℂ_fld)
39	38	a1i 11	. . . . . . . . . . . 12 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → ℕ₀ ∈ (SubMnd‘ℂ_fld))
40		eldifi 3987	. . . . . . . . . . . . . 14 ⊢ (𝑦 ∈ (𝐼 ∖ {𝑥}) → 𝑦 ∈ 𝐼)
41		ffvelrn 6668	. . . . . . . . . . . . . 14 ⊢ ((𝑋:𝐼⟶ℕ₀ ∧ 𝑦 ∈ 𝐼) → (𝑋‘𝑦) ∈ ℕ₀)
42	20, 40, 41	syl2an 586	. . . . . . . . . . . . 13 ⊢ ((((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) ∧ 𝑦 ∈ (𝐼 ∖ {𝑥})) → (𝑋‘𝑦) ∈ ℕ₀)
43	42	fmpttd 6696	. . . . . . . . . . . 12 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)):(𝐼 ∖ {𝑥})⟶ℕ₀)
44	36	mptexd 6807	. . . . . . . . . . . . . 14 ⊢ (𝐼 ∈ 𝑉 → (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) ∈ V)
45	44	ad2antrr 713	. . . . . . . . . . . . 13 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) ∈ V)
46		funmpt 6220	. . . . . . . . . . . . . 14 ⊢ Fun (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))
47	46	a1i 11	. . . . . . . . . . . . 13 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → Fun (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)))
48		funmpt 6220	. . . . . . . . . . . . . 14 ⊢ Fun (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦))
49		difss 3992	. . . . . . . . . . . . . . . 16 ⊢ (𝐼 ∖ {𝑥}) ⊆ 𝐼
50		resmpt 5744	. . . . . . . . . . . . . . . 16 ⊢ ((𝐼 ∖ {𝑥}) ⊆ 𝐼 → ((𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) ↾ (𝐼 ∖ {𝑥})) = (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)))
51	49, 50	ax-mp 5	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) ↾ (𝐼 ∖ {𝑥})) = (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))
52		resss 5717	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) ↾ (𝐼 ∖ {𝑥})) ⊆ (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦))
53	51, 52	eqsstr3i 3886	. . . . . . . . . . . . . 14 ⊢ (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) ⊆ (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦))
54		mptexg 6804	. . . . . . . . . . . . . . 15 ⊢ (𝐼 ∈ 𝑉 → (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) ∈ V)
55	54	ad2antrr 713	. . . . . . . . . . . . . 14 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) ∈ V)
56		funsssuppss 7653	. . . . . . . . . . . . . 14 ⊢ ((Fun (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) ∧ (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) ⊆ (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) ∧ (𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) ∈ V) → ((𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) supp 0) ⊆ ((𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) supp 0))
57	48, 53, 55, 56	mp3an12i 1444	. . . . . . . . . . . . 13 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → ((𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) supp 0) ⊆ ((𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) supp 0))
58		fsuppsssupp 8638	. . . . . . . . . . . . 13 ⊢ ((((𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) ∈ V ∧ Fun (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))) ∧ ((𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) finSupp 0 ∧ ((𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) supp 0) ⊆ ((𝑦 ∈ 𝐼 ↦ (𝑋‘𝑦)) supp 0))) → (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) finSupp 0)
59	45, 47, 26, 57, 58	syl22anc 826	. . . . . . . . . . . 12 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦)) finSupp 0)
60	14, 18, 37, 39, 43, 59	gsumsubmcl 18786	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (ℂ_fld Σ_g (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))) ∈ ℕ₀)
61		ringmnd 19023	. . . . . . . . . . . . . 14 ⊢ (ℂ_fld ∈ Ring → ℂ_fld ∈ Mnd)
62	16, 61	mp1i 13	. . . . . . . . . . . . 13 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → ℂ_fld ∈ Mnd)
63		simprl 758	. . . . . . . . . . . . 13 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → 𝑥 ∈ 𝐼)
64	20, 63	ffvelrnd 6671	. . . . . . . . . . . . . 14 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝑋‘𝑥) ∈ ℕ₀)
65	64	nn0cnd 11763	. . . . . . . . . . . . 13 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝑋‘𝑥) ∈ ℂ)
66		fveq2 6493	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑥 → (𝑋‘𝑦) = (𝑋‘𝑥))
67	13, 66	gsumsn 18821	. . . . . . . . . . . . 13 ⊢ ((ℂ_fld ∈ Mnd ∧ 𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ∈ ℂ) → (ℂ_fld Σ_g (𝑦 ∈ {𝑥} ↦ (𝑋‘𝑦))) = (𝑋‘𝑥))
68	62, 63, 65, 67	syl3anc 1351	. . . . . . . . . . . 12 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (ℂ_fld Σ_g (𝑦 ∈ {𝑥} ↦ (𝑋‘𝑦))) = (𝑋‘𝑥))
69		simprr 760	. . . . . . . . . . . . . 14 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝑋‘𝑥) ≠ 0)
70	69, 2	sylib 210	. . . . . . . . . . . . 13 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → ¬ (𝑋‘𝑥) = 0)
71		elnn0 11703	. . . . . . . . . . . . . 14 ⊢ ((𝑋‘𝑥) ∈ ℕ₀ ↔ ((𝑋‘𝑥) ∈ ℕ ∨ (𝑋‘𝑥) = 0))
72	64, 71	sylib 210	. . . . . . . . . . . . 13 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → ((𝑋‘𝑥) ∈ ℕ ∨ (𝑋‘𝑥) = 0))
73		orel2 874	. . . . . . . . . . . . 13 ⊢ (¬ (𝑋‘𝑥) = 0 → (((𝑋‘𝑥) ∈ ℕ ∨ (𝑋‘𝑥) = 0) → (𝑋‘𝑥) ∈ ℕ))
74	70, 72, 73	sylc 65	. . . . . . . . . . . 12 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝑋‘𝑥) ∈ ℕ)
75	68, 74	eqeltrd 2860	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (ℂ_fld Σ_g (𝑦 ∈ {𝑥} ↦ (𝑋‘𝑦))) ∈ ℕ)
76		nn0nnaddcl 11734	. . . . . . . . . . 11 ⊢ (((ℂ_fld Σ_g (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))) ∈ ℕ₀ ∧ (ℂ_fld Σ_g (𝑦 ∈ {𝑥} ↦ (𝑋‘𝑦))) ∈ ℕ) → ((ℂ_fld Σ_g (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))) + (ℂ_fld Σ_g (𝑦 ∈ {𝑥} ↦ (𝑋‘𝑦)))) ∈ ℕ)
77	60, 75, 76	syl2anc 576	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → ((ℂ_fld Σ_g (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))) + (ℂ_fld Σ_g (𝑦 ∈ {𝑥} ↦ (𝑋‘𝑦)))) ∈ ℕ)
78	77	nnne0d 11484	. . . . . . . . 9 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → ((ℂ_fld Σ_g (𝑦 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑋‘𝑦))) + (ℂ_fld Σ_g (𝑦 ∈ {𝑥} ↦ (𝑋‘𝑦)))) ≠ 0)
79	35, 78	eqnetrd 3028	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ (𝑥 ∈ 𝐼 ∧ (𝑋‘𝑥) ≠ 0)) → (𝐻‘𝑋) ≠ 0)
80	79	expr 449	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ 𝑥 ∈ 𝐼) → ((𝑋‘𝑥) ≠ 0 → (𝐻‘𝑋) ≠ 0))
81	2, 80	syl5bir 235	. . . . . 6 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) ∧ 𝑥 ∈ 𝐼) → (¬ (𝑋‘𝑥) = 0 → (𝐻‘𝑋) ≠ 0))
82	81	rexlimdva 3223	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (∃𝑥 ∈ 𝐼 ¬ (𝑋‘𝑥) = 0 → (𝐻‘𝑋) ≠ 0))
83	1, 82	syl5bir 235	. . . 4 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (¬ ∀𝑥 ∈ 𝐼 (𝑋‘𝑥) = 0 → (𝐻‘𝑋) ≠ 0))
84	83	necon4bd 2981	. . 3 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → ((𝐻‘𝑋) = 0 → ∀𝑥 ∈ 𝐼 (𝑋‘𝑥) = 0))
85	9	ffnd 6339	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → 𝑋 Fn 𝐼)
86		0nn0 11718	. . . . . 6 ⊢ 0 ∈ ℕ₀
87		fnconstg 6390	. . . . . 6 ⊢ (0 ∈ ℕ₀ → (𝐼 × {0}) Fn 𝐼)
88	86, 87	mp1i 13	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (𝐼 × {0}) Fn 𝐼)
89		eqfnfv 6621	. . . . 5 ⊢ ((𝑋 Fn 𝐼 ∧ (𝐼 × {0}) Fn 𝐼) → (𝑋 = (𝐼 × {0}) ↔ ∀𝑥 ∈ 𝐼 (𝑋‘𝑥) = ((𝐼 × {0})‘𝑥)))
90	85, 88, 89	syl2anc 576	. . . 4 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (𝑋 = (𝐼 × {0}) ↔ ∀𝑥 ∈ 𝐼 (𝑋‘𝑥) = ((𝐼 × {0})‘𝑥)))
91		c0ex 10427	. . . . . . 7 ⊢ 0 ∈ V
92	91	fvconst2 6787	. . . . . 6 ⊢ (𝑥 ∈ 𝐼 → ((𝐼 × {0})‘𝑥) = 0)
93	92	eqeq2d 2782	. . . . 5 ⊢ (𝑥 ∈ 𝐼 → ((𝑋‘𝑥) = ((𝐼 × {0})‘𝑥) ↔ (𝑋‘𝑥) = 0))
94	93	ralbiia 3108	. . . 4 ⊢ (∀𝑥 ∈ 𝐼 (𝑋‘𝑥) = ((𝐼 × {0})‘𝑥) ↔ ∀𝑥 ∈ 𝐼 (𝑋‘𝑥) = 0)
95	90, 94	syl6bb 279	. . 3 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (𝑋 = (𝐼 × {0}) ↔ ∀𝑥 ∈ 𝐼 (𝑋‘𝑥) = 0))
96	84, 95	sylibrd 251	. 2 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → ((𝐻‘𝑋) = 0 → 𝑋 = (𝐼 × {0})))
97	8	psrbag0 19981	. . . . . 6 ⊢ (𝐼 ∈ 𝑉 → (𝐼 × {0}) ∈ 𝐴)
98	97	adantr 473	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (𝐼 × {0}) ∈ 𝐴)
99		oveq2 6978	. . . . . 6 ⊢ (ℎ = (𝐼 × {0}) → (ℂ_fld Σ_g ℎ) = (ℂ_fld Σ_g (𝐼 × {0})))
100		ovex 7002	. . . . . 6 ⊢ (ℂ_fld Σ_g (𝐼 × {0})) ∈ V
101	99, 4, 100	fvmpt 6589	. . . . 5 ⊢ ((𝐼 × {0}) ∈ 𝐴 → (𝐻‘(𝐼 × {0})) = (ℂ_fld Σ_g (𝐼 × {0})))
102	98, 101	syl 17	. . . 4 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (𝐻‘(𝐼 × {0})) = (ℂ_fld Σ_g (𝐼 × {0})))
103		fconstmpt 5458	. . . . . 6 ⊢ (𝐼 × {0}) = (𝑥 ∈ 𝐼 ↦ 0)
104	103	oveq2i 6981	. . . . 5 ⊢ (ℂ_fld Σ_g (𝐼 × {0})) = (ℂ_fld Σ_g (𝑥 ∈ 𝐼 ↦ 0))
105	16, 61	ax-mp 5	. . . . . . 7 ⊢ ℂ_fld ∈ Mnd
106	14	gsumz 17836	. . . . . . 7 ⊢ ((ℂ_fld ∈ Mnd ∧ 𝐼 ∈ 𝑉) → (ℂ_fld Σ_g (𝑥 ∈ 𝐼 ↦ 0)) = 0)
107	105, 106	mpan 677	. . . . . 6 ⊢ (𝐼 ∈ 𝑉 → (ℂ_fld Σ_g (𝑥 ∈ 𝐼 ↦ 0)) = 0)
108	107	adantr 473	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (ℂ_fld Σ_g (𝑥 ∈ 𝐼 ↦ 0)) = 0)
109	104, 108	syl5eq 2820	. . . 4 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (ℂ_fld Σ_g (𝐼 × {0})) = 0)
110	102, 109	eqtrd 2808	. . 3 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (𝐻‘(𝐼 × {0})) = 0)
111		fveqeq2 6502	. . 3 ⊢ (𝑋 = (𝐼 × {0}) → ((𝐻‘𝑋) = 0 ↔ (𝐻‘(𝐼 × {0})) = 0))
112	110, 111	syl5ibrcom 239	. 2 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → (𝑋 = (𝐼 × {0}) → (𝐻‘𝑋) = 0))
113	96, 112	impbid 204	1 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑋 ∈ 𝐴) → ((𝐻‘𝑋) = 0 ↔ 𝑋 = (𝐼 × {0})))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 198 ∧ wa 387 ∨ wo 833 = wceq 1507 ∈ wcel 2050 ≠ wne 2961 ∀wral 3082 ∃wrex 3083 {crab 3086 Vcvv 3409 ∖ cdif 3820 ∪ cun 3821 ∩ cin 3822 ⊆ wss 3823 ∅c0 4172 {csn 4435 class class class wbr 4923 ↦ cmpt 5002 × cxp 5399 ^◡ccnv 5400 ↾ cres 5403 “ cima 5404 Fun wfun 6176 Fn wfn 6177 ⟶wf 6178 ‘cfv 6182 (class class class)co 6970 supp csupp 7627 ↑_𝑚 cmap 8200 Fincfn 8300 finSupp cfsupp 8622 ℂcc 10327 0cc0 10329 + caddc 10332 ℕcn 11433 ℕ₀cn0 11701 Σ_g cgsu 16564 Mndcmnd 17756 SubMndcsubmnd 17796 CMndccmn 18660 Ringcrg 19014 ℂ_fldccnfld 20241

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1758 ax-4 1772 ax-5 1869 ax-6 1928 ax-7 1965 ax-8 2052 ax-9 2059 ax-10 2079 ax-11 2093 ax-12 2106 ax-13 2301 ax-ext 2744 ax-rep 5043 ax-sep 5054 ax-nul 5061 ax-pow 5113 ax-pr 5180 ax-un 7273 ax-cnex 10385 ax-resscn 10386 ax-1cn 10387 ax-icn 10388 ax-addcl 10389 ax-addrcl 10390 ax-mulcl 10391 ax-mulrcl 10392 ax-mulcom 10393 ax-addass 10394 ax-mulass 10395 ax-distr 10396 ax-i2m1 10397 ax-1ne0 10398 ax-1rid 10399 ax-rnegex 10400 ax-rrecex 10401 ax-cnre 10402 ax-pre-lttri 10403 ax-pre-lttrn 10404 ax-pre-ltadd 10405 ax-pre-mulgt0 10406 ax-addf 10408 ax-mulf 10409

This theorem depends on definitions: df-bi 199 df-an 388 df-or 834 df-3or 1069 df-3an 1070 df-tru 1510 df-ex 1743 df-nf 1747 df-sb 2016 df-mo 2547 df-eu 2584 df-clab 2753 df-cleq 2765 df-clel 2840 df-nfc 2912 df-ne 2962 df-nel 3068 df-ral 3087 df-rex 3088 df-reu 3089 df-rmo 3090 df-rab 3091 df-v 3411 df-sbc 3676 df-csb 3781 df-dif 3826 df-un 3828 df-in 3830 df-ss 3837 df-pss 3839 df-nul 4173 df-if 4345 df-pw 4418 df-sn 4436 df-pr 4438 df-tp 4440 df-op 4442 df-uni 4707 df-int 4744 df-iun 4788 df-iin 4789 df-br 4924 df-opab 4986 df-mpt 5003 df-tr 5025 df-id 5306 df-eprel 5311 df-po 5320 df-so 5321 df-fr 5360 df-se 5361 df-we 5362 df-xp 5407 df-rel 5408 df-cnv 5409 df-co 5410 df-dm 5411 df-rn 5412 df-res 5413 df-ima 5414 df-pred 5980 df-ord 6026 df-on 6027 df-lim 6028 df-suc 6029 df-iota 6146 df-fun 6184 df-fn 6185 df-f 6186 df-f1 6187 df-fo 6188 df-f1o 6189 df-fv 6190 df-isom 6191 df-riota 6931 df-ov 6973 df-oprab 6974 df-mpo 6975 df-of 7221 df-om 7391 df-1st 7495 df-2nd 7496 df-supp 7628 df-wrecs 7744 df-recs 7806 df-rdg 7844 df-1o 7899 df-oadd 7903 df-er 8083 df-map 8202 df-en 8301 df-dom 8302 df-sdom 8303 df-fin 8304 df-fsupp 8623 df-oi 8763 df-card 9156 df-pnf 10470 df-mnf 10471 df-xr 10472 df-ltxr 10473 df-le 10474 df-sub 10666 df-neg 10667 df-nn 11434 df-2 11497 df-3 11498 df-4 11499 df-5 11500 df-6 11501 df-7 11502 df-8 11503 df-9 11504 df-n0 11702 df-z 11788 df-dec 11906 df-uz 12053 df-fz 12703 df-fzo 12844 df-seq 13179 df-hash 13500 df-struct 16335 df-ndx 16336 df-slot 16337 df-base 16339 df-sets 16340 df-ress 16341 df-plusg 16428 df-mulr 16429 df-starv 16430 df-tset 16434 df-ple 16435 df-ds 16437 df-unif 16438 df-0g 16565 df-gsum 16566 df-mre 16709 df-mrc 16710 df-acs 16712 df-mgm 17704 df-sgrp 17746 df-mnd 17757 df-submnd 17798 df-grp 17888 df-minusg 17889 df-mulg 18006 df-cntz 18212 df-cmn 18662 df-abl 18663 df-mgp 18957 df-ur 18969 df-ring 19016 df-cring 19017 df-cnfld 20242

This theorem is referenced by: mdegle0 24368

W3C validator