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Theorem dpjidcl 19969

Description: The key property of projections: the sum of all the projections of 𝐴 is 𝐴. (Contributed by Mario Carneiro, 26-Apr-2016.) (Revised by AV, 14-Jul-2019.)

**Hypotheses**
Ref	Expression
dpjfval.1	⊢ (𝜑 → 𝐺dom DProd 𝑆)
dpjfval.2	⊢ (𝜑 → dom 𝑆 = 𝐼)
dpjfval.p	⊢ 𝑃 = (𝐺dProj𝑆)
dpjidcl.3	⊢ (𝜑 → 𝐴 ∈ (𝐺 DProd 𝑆))
dpjidcl.0	⊢ 0 = (0_g‘𝐺)
dpjidcl.w	⊢ 𝑊 = {ℎ ∈ X𝑖 ∈ 𝐼 (𝑆‘𝑖) ∣ ℎ finSupp 0 }

**Assertion**
Ref	Expression
dpjidcl	⊢ (𝜑 → ((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)))))

Distinct variable groups: 𝑥,ℎ, 0 ℎ,𝑖,𝐺,𝑥 𝑃,ℎ,𝑥 𝜑,𝑖,𝑥 ℎ,𝐼,𝑖,𝑥 𝑥,𝑊 𝐴,ℎ,𝑥 𝑆,ℎ,𝑖,𝑥 Allowed substitution hints: 𝜑(ℎ) 𝐴(𝑖) 𝑃(𝑖) 𝑊(ℎ,𝑖) 0 (𝑖)

Proof of Theorem dpjidcl Dummy variables 𝑘 𝑓 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		dpjidcl.3	. . . 4 ⊢ (𝜑 → 𝐴 ∈ (𝐺 DProd 𝑆))
2		dpjfval.2	. . . . 5 ⊢ (𝜑 → dom 𝑆 = 𝐼)
3		dpjidcl.0	. . . . . 6 ⊢ 0 = (0_g‘𝐺)
4		dpjidcl.w	. . . . . 6 ⊢ 𝑊 = {ℎ ∈ X𝑖 ∈ 𝐼 (𝑆‘𝑖) ∣ ℎ finSupp 0 }
5	3, 4	eldprd 19915	. . . . 5 ⊢ (dom 𝑆 = 𝐼 → (𝐴 ∈ (𝐺 DProd 𝑆) ↔ (𝐺dom DProd 𝑆 ∧ ∃𝑓 ∈ 𝑊 𝐴 = (𝐺 Σ_g 𝑓))))
6	2, 5	syl 17	. . . 4 ⊢ (𝜑 → (𝐴 ∈ (𝐺 DProd 𝑆) ↔ (𝐺dom DProd 𝑆 ∧ ∃𝑓 ∈ 𝑊 𝐴 = (𝐺 Σ_g 𝑓))))
7	1, 6	mpbid 231	. . 3 ⊢ (𝜑 → (𝐺dom DProd 𝑆 ∧ ∃𝑓 ∈ 𝑊 𝐴 = (𝐺 Σ_g 𝑓)))
8	7	simprd 496	. 2 ⊢ (𝜑 → ∃𝑓 ∈ 𝑊 𝐴 = (𝐺 Σ_g 𝑓))
9		dpjfval.1	. . . . 5 ⊢ (𝜑 → 𝐺dom DProd 𝑆)
10	9	adantr 481	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝐺dom DProd 𝑆)
11	2	adantr 481	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → dom 𝑆 = 𝐼)
12	9	ad2antrr 724	. . . . . 6 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐺dom DProd 𝑆)
13	2	ad2antrr 724	. . . . . 6 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → dom 𝑆 = 𝐼)
14		dpjfval.p	. . . . . 6 ⊢ 𝑃 = (𝐺dProj𝑆)
15		simpr 485	. . . . . 6 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑥 ∈ 𝐼)
16	12, 13, 14, 15	dpjf 19968	. . . . 5 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑃‘𝑥):(𝐺 DProd 𝑆)⟶(𝑆‘𝑥))
17	1	ad2antrr 724	. . . . 5 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐴 ∈ (𝐺 DProd 𝑆))
18	16, 17	ffvelcdmd 7087	. . . 4 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((𝑃‘𝑥)‘𝐴) ∈ (𝑆‘𝑥))
19	9, 2	dprddomcld 19912	. . . . . . 7 ⊢ (𝜑 → 𝐼 ∈ V)
20	19	mptexd 7228	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ V)
21	20	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ V)
22		funmpt 6586	. . . . . 6 ⊢ Fun (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴))
23	22	a1i 11	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → Fun (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)))
24		simprl 769	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓 ∈ 𝑊)
25	4, 10, 11, 24	dprdffsupp 19925	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓 finSupp 0 )
26		eldifi 4126	. . . . . . . 8 ⊢ (𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 )) → 𝑥 ∈ 𝐼)
27		eqid 2732	. . . . . . . . . 10 ⊢ (proj₁‘𝐺) = (proj₁‘𝐺)
28	12, 13, 14, 27, 15	dpjval 19967	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑃‘𝑥) = ((𝑆‘𝑥)(proj₁‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))))
29	28	fveq1d 6893	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((𝑃‘𝑥)‘𝐴) = (((𝑆‘𝑥)(proj₁‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))‘𝐴))
30	26, 29	sylan2 593	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → ((𝑃‘𝑥)‘𝐴) = (((𝑆‘𝑥)(proj₁‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))‘𝐴))
31		simplrr 776	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐴 = (𝐺 Σ_g 𝑓))
32		eqid 2732	. . . . . . . . . . 11 ⊢ (Base‘𝐺) = (Base‘𝐺)
33		eqid 2732	. . . . . . . . . . 11 ⊢ (Cntz‘𝐺) = (Cntz‘𝐺)
34		dprdgrp 19916	. . . . . . . . . . . . 13 ⊢ (𝐺dom DProd 𝑆 → 𝐺 ∈ Grp)
35		grpmnd 18862	. . . . . . . . . . . . 13 ⊢ (𝐺 ∈ Grp → 𝐺 ∈ Mnd)
36	10, 34, 35	3syl 18	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝐺 ∈ Mnd)
37	36	adantr 481	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐺 ∈ Mnd)
38	19	ad2antrr 724	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐼 ∈ V)
39	4, 10, 11, 24, 32	dprdff 19923	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓:𝐼⟶(Base‘𝐺))
40	39	adantr 481	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝑓:𝐼⟶(Base‘𝐺))
41	24	adantr 481	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓 ∈ 𝑊)
42	4, 12, 13, 41, 33	dprdfcntz 19926	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ran 𝑓 ⊆ ((Cntz‘𝐺)‘ran 𝑓))
43	26, 42	sylan2 593	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → ran 𝑓 ⊆ ((Cntz‘𝐺)‘ran 𝑓))
44		snssi 4811	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 )) → {𝑥} ⊆ (𝐼 ∖ (𝑓 supp 0 )))
45	44	adantl 482	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → {𝑥} ⊆ (𝐼 ∖ (𝑓 supp 0 )))
46	45	difss2d 4134	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → {𝑥} ⊆ 𝐼)
47		suppssdm 8164	. . . . . . . . . . . . . . 15 ⊢ (𝑓 supp 0 ) ⊆ dom 𝑓
48	47, 39	fssdm 6737	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑓 supp 0 ) ⊆ 𝐼)
49	48	adantr 481	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → (𝑓 supp 0 ) ⊆ 𝐼)
50		ssconb 4137	. . . . . . . . . . . . 13 ⊢ (({𝑥} ⊆ 𝐼 ∧ (𝑓 supp 0 ) ⊆ 𝐼) → ({𝑥} ⊆ (𝐼 ∖ (𝑓 supp 0 )) ↔ (𝑓 supp 0 ) ⊆ (𝐼 ∖ {𝑥})))
51	46, 49, 50	syl2anc 584	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → ({𝑥} ⊆ (𝐼 ∖ (𝑓 supp 0 )) ↔ (𝑓 supp 0 ) ⊆ (𝐼 ∖ {𝑥})))
52	45, 51	mpbid 231	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → (𝑓 supp 0 ) ⊆ (𝐼 ∖ {𝑥}))
53	25	adantr 481	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝑓 finSupp 0 )
54	32, 3, 33, 37, 38, 40, 43, 52, 53	gsumzres 19818	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → (𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥}))) = (𝐺 Σ_g 𝑓))
55	31, 54	eqtr4d 2775	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐴 = (𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥}))))
56		eqid 2732	. . . . . . . . . . 11 ⊢ {ℎ ∈ X𝑖 ∈ (𝐼 ∖ {𝑥})((𝑆 ↾ (𝐼 ∖ {𝑥}))‘𝑖) ∣ ℎ finSupp 0 } = {ℎ ∈ X𝑖 ∈ (𝐼 ∖ {𝑥})((𝑆 ↾ (𝐼 ∖ {𝑥}))‘𝑖) ∣ ℎ finSupp 0 }
57		difss 4131	. . . . . . . . . . . . . 14 ⊢ (𝐼 ∖ {𝑥}) ⊆ 𝐼
58	57	a1i 11	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐼 ∖ {𝑥}) ⊆ 𝐼)
59	12, 13, 58	dprdres 19939	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺dom DProd (𝑆 ↾ (𝐼 ∖ {𝑥})) ∧ (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))) ⊆ (𝐺 DProd 𝑆)))
60	59	simpld 495	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐺dom DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))
61	12, 13	dprdf2 19918	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑆:𝐼⟶(SubGrp‘𝐺))
62		fssres 6757	. . . . . . . . . . . . 13 ⊢ ((𝑆:𝐼⟶(SubGrp‘𝐺) ∧ (𝐼 ∖ {𝑥}) ⊆ 𝐼) → (𝑆 ↾ (𝐼 ∖ {𝑥})):(𝐼 ∖ {𝑥})⟶(SubGrp‘𝐺))
63	61, 57, 62	sylancl 586	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑆 ↾ (𝐼 ∖ {𝑥})):(𝐼 ∖ {𝑥})⟶(SubGrp‘𝐺))
64	63	fdmd 6728	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → dom (𝑆 ↾ (𝐼 ∖ {𝑥})) = (𝐼 ∖ {𝑥}))
65	39	adantr 481	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓:𝐼⟶(Base‘𝐺))
66	65	feqmptd 6960	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓 = (𝑘 ∈ 𝐼 ↦ (𝑓‘𝑘)))
67	66	reseq1d 5980	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓 ↾ (𝐼 ∖ {𝑥})) = ((𝑘 ∈ 𝐼 ↦ (𝑓‘𝑘)) ↾ (𝐼 ∖ {𝑥})))
68		resmpt 6037	. . . . . . . . . . . . . 14 ⊢ ((𝐼 ∖ {𝑥}) ⊆ 𝐼 → ((𝑘 ∈ 𝐼 ↦ (𝑓‘𝑘)) ↾ (𝐼 ∖ {𝑥})) = (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)))
69	57, 68	ax-mp 5	. . . . . . . . . . . . 13 ⊢ ((𝑘 ∈ 𝐼 ↦ (𝑓‘𝑘)) ↾ (𝐼 ∖ {𝑥})) = (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘))
70	67, 69	eqtrdi 2788	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓 ↾ (𝐼 ∖ {𝑥})) = (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)))
71		eldifi 4126	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ (𝐼 ∖ {𝑥}) → 𝑘 ∈ 𝐼)
72	4, 12, 13, 41	dprdfcl 19924	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ 𝐼) → (𝑓‘𝑘) ∈ (𝑆‘𝑘))
73	71, 72	sylan2 593	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ (𝐼 ∖ {𝑥})) → (𝑓‘𝑘) ∈ (𝑆‘𝑘))
74		fvres 6910	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ (𝐼 ∖ {𝑥}) → ((𝑆 ↾ (𝐼 ∖ {𝑥}))‘𝑘) = (𝑆‘𝑘))
75	74	adantl 482	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ (𝐼 ∖ {𝑥})) → ((𝑆 ↾ (𝐼 ∖ {𝑥}))‘𝑘) = (𝑆‘𝑘))
76	73, 75	eleqtrrd 2836	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ (𝐼 ∖ {𝑥})) → (𝑓‘𝑘) ∈ ((𝑆 ↾ (𝐼 ∖ {𝑥}))‘𝑘))
77	19	difexd 5329	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝐼 ∖ {𝑥}) ∈ V)
78	77	mptexd 7228	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) ∈ V)
79	78	ad2antrr 724	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) ∈ V)
80		funmpt 6586	. . . . . . . . . . . . . . 15 ⊢ Fun (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘))
81	80	a1i 11	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → Fun (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)))
82	25	adantr 481	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓 finSupp 0 )
83		ssdif 4139	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐼 ∖ {𝑥}) ⊆ 𝐼 → ((𝐼 ∖ {𝑥}) ∖ (𝑓 supp 0 )) ⊆ (𝐼 ∖ (𝑓 supp 0 )))
84	57, 83	ax-mp 5	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐼 ∖ {𝑥}) ∖ (𝑓 supp 0 )) ⊆ (𝐼 ∖ (𝑓 supp 0 ))
85	84	sseli 3978	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 ∈ ((𝐼 ∖ {𝑥}) ∖ (𝑓 supp 0 )) → 𝑘 ∈ (𝐼 ∖ (𝑓 supp 0 )))
86		ssidd 4005	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓 supp 0 ) ⊆ (𝑓 supp 0 ))
87	19	ad2antrr 724	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐼 ∈ V)
88	3	fvexi 6905	. . . . . . . . . . . . . . . . . 18 ⊢ 0 ∈ V
89	88	a1i 11	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 0 ∈ V)
90	65, 86, 87, 89	suppssr 8183	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → (𝑓‘𝑘) = 0 )
91	85, 90	sylan2 593	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ ((𝐼 ∖ {𝑥}) ∖ (𝑓 supp 0 ))) → (𝑓‘𝑘) = 0 )
92	77	ad2antrr 724	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐼 ∖ {𝑥}) ∈ V)
93	91, 92	suppss2 8187	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) supp 0 ) ⊆ (𝑓 supp 0 ))
94		fsuppsssupp 9381	. . . . . . . . . . . . . 14 ⊢ ((((𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) ∈ V ∧ Fun (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘))) ∧ (𝑓 finSupp 0 ∧ ((𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) supp 0 ) ⊆ (𝑓 supp 0 ))) → (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) finSupp 0 )
95	79, 81, 82, 93, 94	syl22anc 837	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) finSupp 0 )
96	56, 60, 64, 76, 95	dprdwd 19922	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) ∈ {ℎ ∈ X𝑖 ∈ (𝐼 ∖ {𝑥})((𝑆 ↾ (𝐼 ∖ {𝑥}))‘𝑖) ∣ ℎ finSupp 0 })
97	70, 96	eqeltrd 2833	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓 ↾ (𝐼 ∖ {𝑥})) ∈ {ℎ ∈ X𝑖 ∈ (𝐼 ∖ {𝑥})((𝑆 ↾ (𝐼 ∖ {𝑥}))‘𝑖) ∣ ℎ finSupp 0 })
98	3, 56, 60, 64, 97	eldprdi 19929	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥}))) ∈ (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))
99	26, 98	sylan2 593	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → (𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥}))) ∈ (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))
100	55, 99	eqeltrd 2833	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐴 ∈ (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))
101		eqid 2732	. . . . . . . . . 10 ⊢ (+_g‘𝐺) = (+_g‘𝐺)
102		eqid 2732	. . . . . . . . . 10 ⊢ (LSSum‘𝐺) = (LSSum‘𝐺)
103	61, 15	ffvelcdmd 7087	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑆‘𝑥) ∈ (SubGrp‘𝐺))
104		dprdsubg 19935	. . . . . . . . . . 11 ⊢ (𝐺dom DProd (𝑆 ↾ (𝐼 ∖ {𝑥})) → (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))) ∈ (SubGrp‘𝐺))
105	60, 104	syl 17	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))) ∈ (SubGrp‘𝐺))
106	12, 13, 15, 3	dpjdisj 19964	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((𝑆‘𝑥) ∩ (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))) = { 0 })
107	12, 13, 15, 33	dpjcntz 19963	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑆‘𝑥) ⊆ ((Cntz‘𝐺)‘(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))))
108	101, 102, 3, 33, 103, 105, 106, 107, 27	pj1rid 19611	. . . . . . . . 9 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝐴 ∈ (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))) → (((𝑆‘𝑥)(proj₁‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))‘𝐴) = 0 )
109	26, 108	sylanl2 679	. . . . . . . 8 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) ∧ 𝐴 ∈ (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))) → (((𝑆‘𝑥)(proj₁‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))‘𝐴) = 0 )
110	100, 109	mpdan 685	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → (((𝑆‘𝑥)(proj₁‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))‘𝐴) = 0 )
111	30, 110	eqtrd 2772	. . . . . 6 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → ((𝑃‘𝑥)‘𝐴) = 0 )
112	19	adantr 481	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝐼 ∈ V)
113	111, 112	suppss2 8187	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → ((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) supp 0 ) ⊆ (𝑓 supp 0 ))
114		fsuppsssupp 9381	. . . . 5 ⊢ ((((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ V ∧ Fun (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴))) ∧ (𝑓 finSupp 0 ∧ ((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) supp 0 ) ⊆ (𝑓 supp 0 ))) → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) finSupp 0 )
115	21, 23, 25, 113, 114	syl22anc 837	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) finSupp 0 )
116	4, 10, 11, 18, 115	dprdwd 19922	. . 3 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ 𝑊)
117		simprr 771	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝐴 = (𝐺 Σ_g 𝑓))
118	39	feqmptd 6960	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓 = (𝑥 ∈ 𝐼 ↦ (𝑓‘𝑥)))
119		simplrr 776	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐴 = (𝐺 Σ_g 𝑓))
120	12, 34, 35	3syl 18	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐺 ∈ Mnd)
121	4, 12, 13, 41	dprdffsupp 19925	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓 finSupp 0 )
122		disjdif 4471	. . . . . . . . . . . . 13 ⊢ ({𝑥} ∩ (𝐼 ∖ {𝑥})) = ∅
123	122	a1i 11	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ({𝑥} ∩ (𝐼 ∖ {𝑥})) = ∅)
124		undif2 4476	. . . . . . . . . . . . 13 ⊢ ({𝑥} ∪ (𝐼 ∖ {𝑥})) = ({𝑥} ∪ 𝐼)
125	15	snssd 4812	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → {𝑥} ⊆ 𝐼)
126		ssequn1 4180	. . . . . . . . . . . . . 14 ⊢ ({𝑥} ⊆ 𝐼 ↔ ({𝑥} ∪ 𝐼) = 𝐼)
127	125, 126	sylib 217	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ({𝑥} ∪ 𝐼) = 𝐼)
128	124, 127	eqtr2id 2785	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐼 = ({𝑥} ∪ (𝐼 ∖ {𝑥})))
129	32, 3, 101, 33, 120, 87, 65, 42, 121, 123, 128	gsumzsplit 19836	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺 Σ_g 𝑓) = ((𝐺 Σ_g (𝑓 ↾ {𝑥}))(+_g‘𝐺)(𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥})))))
130	65, 125	feqresmpt 6961	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓 ↾ {𝑥}) = (𝑘 ∈ {𝑥} ↦ (𝑓‘𝑘)))
131	130	oveq2d 7427	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺 Σ_g (𝑓 ↾ {𝑥})) = (𝐺 Σ_g (𝑘 ∈ {𝑥} ↦ (𝑓‘𝑘))))
132	65, 15	ffvelcdmd 7087	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓‘𝑥) ∈ (Base‘𝐺))
133		fveq2 6891	. . . . . . . . . . . . . . 15 ⊢ (𝑘 = 𝑥 → (𝑓‘𝑘) = (𝑓‘𝑥))
134	32, 133	gsumsn 19863	. . . . . . . . . . . . . 14 ⊢ ((𝐺 ∈ Mnd ∧ 𝑥 ∈ 𝐼 ∧ (𝑓‘𝑥) ∈ (Base‘𝐺)) → (𝐺 Σ_g (𝑘 ∈ {𝑥} ↦ (𝑓‘𝑘))) = (𝑓‘𝑥))
135	120, 15, 132, 134	syl3anc 1371	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺 Σ_g (𝑘 ∈ {𝑥} ↦ (𝑓‘𝑘))) = (𝑓‘𝑥))
136	131, 135	eqtrd 2772	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺 Σ_g (𝑓 ↾ {𝑥})) = (𝑓‘𝑥))
137	136	oveq1d 7426	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((𝐺 Σ_g (𝑓 ↾ {𝑥}))(+_g‘𝐺)(𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥})))) = ((𝑓‘𝑥)(+_g‘𝐺)(𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥})))))
138	119, 129, 137	3eqtrd 2776	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐴 = ((𝑓‘𝑥)(+_g‘𝐺)(𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥})))))
139	12, 13, 15, 102	dpjlsm 19965	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺 DProd 𝑆) = ((𝑆‘𝑥)(LSSum‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))))
140	17, 139	eleqtrd 2835	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐴 ∈ ((𝑆‘𝑥)(LSSum‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))))
141	4, 10, 11, 24	dprdfcl 19924	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓‘𝑥) ∈ (𝑆‘𝑥))
142	101, 102, 3, 33, 103, 105, 106, 107, 27, 140, 141, 98	pj1eq 19609	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐴 = ((𝑓‘𝑥)(+_g‘𝐺)(𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥})))) ↔ ((((𝑆‘𝑥)(proj₁‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))‘𝐴) = (𝑓‘𝑥) ∧ (((𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))(proj₁‘𝐺)(𝑆‘𝑥))‘𝐴) = (𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥}))))))
143	138, 142	mpbid 231	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((((𝑆‘𝑥)(proj₁‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))‘𝐴) = (𝑓‘𝑥) ∧ (((𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))(proj₁‘𝐺)(𝑆‘𝑥))‘𝐴) = (𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥})))))
144	143	simpld 495	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (((𝑆‘𝑥)(proj₁‘𝐺)(𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))‘𝐴) = (𝑓‘𝑥))
145	29, 144	eqtrd 2772	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((𝑃‘𝑥)‘𝐴) = (𝑓‘𝑥))
146	145	mpteq2dva 5248	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) = (𝑥 ∈ 𝐼 ↦ (𝑓‘𝑥)))
147	118, 146	eqtr4d 2775	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓 = (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)))
148	147	oveq2d 7427	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝐺 Σ_g 𝑓) = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴))))
149	117, 148	eqtrd 2772	. . 3 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴))))
150	116, 149	jca 512	. 2 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → ((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)))))
151	8, 150	rexlimddv 3161	1 ⊢ (𝜑 → ((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ∃wrex 3070 {crab 3432 Vcvv 3474 ∖ cdif 3945 ∪ cun 3946 ∩ cin 3947 ⊆ wss 3948 ∅c0 4322 {csn 4628 class class class wbr 5148 ↦ cmpt 5231 dom cdm 5676 ran crn 5677 ↾ cres 5678 Fun wfun 6537 ⟶wf 6539 ‘cfv 6543 (class class class)co 7411 supp csupp 8148 Xcixp 8893 finSupp cfsupp 9363 Basecbs 17148 +_gcplusg 17201 0_gc0g 17389 Σ_g cgsu 17390 Mndcmnd 18659 Grpcgrp 18855 SubGrpcsubg 19036 Cntzccntz 19220 LSSumclsm 19543 proj₁cpj1 19544 DProd cdprd 19904 dProjcdpj 19905

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-iin 5000 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-se 5632 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-of 7672 df-om 7858 df-1st 7977 df-2nd 7978 df-supp 8149 df-tpos 8213 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-1o 8468 df-er 8705 df-map 8824 df-ixp 8894 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-fsupp 9364 df-oi 9507 df-card 9936 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-nn 12217 df-2 12279 df-n0 12477 df-z 12563 df-uz 12827 df-fz 13489 df-fzo 13632 df-seq 13971 df-hash 14295 df-sets 17101 df-slot 17119 df-ndx 17131 df-base 17149 df-ress 17178 df-plusg 17214 df-0g 17391 df-gsum 17392 df-mre 17534 df-mrc 17535 df-acs 17537 df-mgm 18565 df-sgrp 18644 df-mnd 18660 df-mhm 18705 df-submnd 18706 df-grp 18858 df-minusg 18859 df-sbg 18860 df-mulg 18987 df-subg 19039 df-ghm 19128 df-gim 19173 df-cntz 19222 df-oppg 19251 df-lsm 19545 df-pj1 19546 df-cmn 19691 df-dprd 19906 df-dpj 19907

This theorem is referenced by: dpjeq 19970 dpjid 19971

W3C validator