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Theorem dpjidcl 20006

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 19952	. . . . 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 495	. 2 ⊢ (𝜑 → ∃𝑓 ∈ 𝑊 𝐴 = (𝐺 Σ_g 𝑓))
9		dpjfval.1	. . . . 5 ⊢ (𝜑 → 𝐺dom DProd 𝑆)
10	9	adantr 480	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝐺dom DProd 𝑆)
11	2	adantr 480	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → dom 𝑆 = 𝐼)
12	9	ad2antrr 725	. . . . . 6 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐺dom DProd 𝑆)
13	2	ad2antrr 725	. . . . . 6 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → dom 𝑆 = 𝐼)
14		dpjfval.p	. . . . . 6 ⊢ 𝑃 = (𝐺dProj𝑆)
15		simpr 484	. . . . . 6 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑥 ∈ 𝐼)
16	12, 13, 14, 15	dpjf 20005	. . . . 5 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑃‘𝑥):(𝐺 DProd 𝑆)⟶(𝑆‘𝑥))
17	1	ad2antrr 725	. . . . 5 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐴 ∈ (𝐺 DProd 𝑆))
18	16, 17	ffvelcdmd 7089	. . . 4 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((𝑃‘𝑥)‘𝐴) ∈ (𝑆‘𝑥))
19	9, 2	dprddomcld 19949	. . . . . . 7 ⊢ (𝜑 → 𝐼 ∈ V)
20	19	mptexd 7230	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ V)
21	20	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ V)
22		funmpt 6585	. . . . . 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 770	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓 ∈ 𝑊)
25	4, 10, 11, 24	dprdffsupp 19962	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓 finSupp 0 )
26		eldifi 4122	. . . . . . . 8 ⊢ (𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 )) → 𝑥 ∈ 𝐼)
27		eqid 2727	. . . . . . . . . 10 ⊢ (proj₁‘𝐺) = (proj₁‘𝐺)
28	12, 13, 14, 27, 15	dpjval 20004	. . . . . . . . 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 592	. . . . . . 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 777	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐴 = (𝐺 Σ_g 𝑓))
32		eqid 2727	. . . . . . . . . . 11 ⊢ (Base‘𝐺) = (Base‘𝐺)
33		eqid 2727	. . . . . . . . . . 11 ⊢ (Cntz‘𝐺) = (Cntz‘𝐺)
34		dprdgrp 19953	. . . . . . . . . . . . 13 ⊢ (𝐺dom DProd 𝑆 → 𝐺 ∈ Grp)
35		grpmnd 18888	. . . . . . . . . . . . 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 480	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐺 ∈ Mnd)
38	19	ad2antrr 725	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐼 ∈ V)
39	4, 10, 11, 24, 32	dprdff 19960	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓:𝐼⟶(Base‘𝐺))
40	39	adantr 480	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝑓:𝐼⟶(Base‘𝐺))
41	24	adantr 480	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓 ∈ 𝑊)
42	4, 12, 13, 41, 33	dprdfcntz 19963	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ran 𝑓 ⊆ ((Cntz‘𝐺)‘ran 𝑓))
43	26, 42	sylan2 592	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → ran 𝑓 ⊆ ((Cntz‘𝐺)‘ran 𝑓))
44		snssi 4807	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 )) → {𝑥} ⊆ (𝐼 ∖ (𝑓 supp 0 )))
45	44	adantl 481	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → {𝑥} ⊆ (𝐼 ∖ (𝑓 supp 0 )))
46	45	difss2d 4130	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → {𝑥} ⊆ 𝐼)
47		suppssdm 8175	. . . . . . . . . . . . . . 15 ⊢ (𝑓 supp 0 ) ⊆ dom 𝑓
48	47, 39	fssdm 6736	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑓 supp 0 ) ⊆ 𝐼)
49	48	adantr 480	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → (𝑓 supp 0 ) ⊆ 𝐼)
50		ssconb 4133	. . . . . . . . . . . . 13 ⊢ (({𝑥} ⊆ 𝐼 ∧ (𝑓 supp 0 ) ⊆ 𝐼) → ({𝑥} ⊆ (𝐼 ∖ (𝑓 supp 0 )) ↔ (𝑓 supp 0 ) ⊆ (𝐼 ∖ {𝑥})))
51	46, 49, 50	syl2anc 583	. . . . . . . . . . . 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 480	. . . . . . . . . . 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 19855	. . . . . . . . . 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 2770	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐴 = (𝐺 Σ_g (𝑓 ↾ (𝐼 ∖ {𝑥}))))
56		eqid 2727	. . . . . . . . . . 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 4127	. . . . . . . . . . . . . 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 19976	. . . . . . . . . . . 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 494	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝐺dom DProd (𝑆 ↾ (𝐼 ∖ {𝑥})))
61	12, 13	dprdf2 19955	. . . . . . . . . . . . 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 585	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑆 ↾ (𝐼 ∖ {𝑥})):(𝐼 ∖ {𝑥})⟶(SubGrp‘𝐺))
64	63	fdmd 6727	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → dom (𝑆 ↾ (𝐼 ∖ {𝑥})) = (𝐼 ∖ {𝑥}))
65	39	adantr 480	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓:𝐼⟶(Base‘𝐺))
66	65	feqmptd 6961	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓 = (𝑘 ∈ 𝐼 ↦ (𝑓‘𝑘)))
67	66	reseq1d 5978	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓 ↾ (𝐼 ∖ {𝑥})) = ((𝑘 ∈ 𝐼 ↦ (𝑓‘𝑘)) ↾ (𝐼 ∖ {𝑥})))
68		resmpt 6035	. . . . . . . . . . . . . 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 2783	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓 ↾ (𝐼 ∖ {𝑥})) = (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)))
71		eldifi 4122	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ (𝐼 ∖ {𝑥}) → 𝑘 ∈ 𝐼)
72	4, 12, 13, 41	dprdfcl 19961	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ 𝐼) → (𝑓‘𝑘) ∈ (𝑆‘𝑘))
73	71, 72	sylan2 592	. . . . . . . . . . . . . 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 481	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ (𝐼 ∖ {𝑥})) → ((𝑆 ↾ (𝐼 ∖ {𝑥}))‘𝑘) = (𝑆‘𝑘))
76	73, 75	eleqtrrd 2831	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ (𝐼 ∖ {𝑥})) → (𝑓‘𝑘) ∈ ((𝑆 ↾ (𝐼 ∖ {𝑥}))‘𝑘))
77	19	difexd 5325	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝐼 ∖ {𝑥}) ∈ V)
78	77	mptexd 7230	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) ∈ V)
79	78	ad2antrr 725	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) ∈ V)
80		funmpt 6585	. . . . . . . . . . . . . . 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 480	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓 finSupp 0 )
83		ssdif 4135	. . . . . . . . . . . . . . . . . 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 3974	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 ∈ ((𝐼 ∖ {𝑥}) ∖ (𝑓 supp 0 )) → 𝑘 ∈ (𝐼 ∖ (𝑓 supp 0 )))
86		ssidd 4001	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓 supp 0 ) ⊆ (𝑓 supp 0 ))
87	19	ad2antrr 725	. . . . . . . . . . . . . . . . 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 8194	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → (𝑓‘𝑘) = 0 )
91	85, 90	sylan2 592	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) ∧ 𝑘 ∈ ((𝐼 ∖ {𝑥}) ∖ (𝑓 supp 0 ))) → (𝑓‘𝑘) = 0 )
92	77	ad2antrr 725	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐼 ∖ {𝑥}) ∈ V)
93	91, 92	suppss2 8199	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((𝑘 ∈ (𝐼 ∖ {𝑥}) ↦ (𝑓‘𝑘)) supp 0 ) ⊆ (𝑓 supp 0 ))
94		fsuppsssupp 9396	. . . . . . . . . . . . . 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 838	. . . . . . . . . . . . 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 19959	. . . . . . . . . . . 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 2828	. . . . . . . . . . 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 19966	. . . . . . . . . 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 592	. . . . . . . . 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 2828	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → 𝐴 ∈ (𝐺 DProd (𝑆 ↾ (𝐼 ∖ {𝑥}))))
101		eqid 2727	. . . . . . . . . 10 ⊢ (+_g‘𝐺) = (+_g‘𝐺)
102		eqid 2727	. . . . . . . . . 10 ⊢ (LSSum‘𝐺) = (LSSum‘𝐺)
103	61, 15	ffvelcdmd 7089	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑆‘𝑥) ∈ (SubGrp‘𝐺))
104		dprdsubg 19972	. . . . . . . . . . 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 20001	. . . . . . . . . 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 20000	. . . . . . . . . 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 19648	. . . . . . . . 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 680	. . . . . . . 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 686	. . . . . . 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 2767	. . . . . 6 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ (𝐼 ∖ (𝑓 supp 0 ))) → ((𝑃‘𝑥)‘𝐴) = 0 )
112	19	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝐼 ∈ V)
113	111, 112	suppss2 8199	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → ((𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) supp 0 ) ⊆ (𝑓 supp 0 ))
114		fsuppsssupp 9396	. . . . 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 838	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) finSupp 0 )
116	4, 10, 11, 18, 115	dprdwd 19959	. . 3 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) ∈ 𝑊)
117		simprr 772	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝐴 = (𝐺 Σ_g 𝑓))
118	39	feqmptd 6961	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓 = (𝑥 ∈ 𝐼 ↦ (𝑓‘𝑥)))
119		simplrr 777	. . . . . . . . . . 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 19962	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → 𝑓 finSupp 0 )
122		disjdif 4467	. . . . . . . . . . . . 13 ⊢ ({𝑥} ∩ (𝐼 ∖ {𝑥})) = ∅
123	122	a1i 11	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ({𝑥} ∩ (𝐼 ∖ {𝑥})) = ∅)
124		undif2 4472	. . . . . . . . . . . . 13 ⊢ ({𝑥} ∪ (𝐼 ∖ {𝑥})) = ({𝑥} ∪ 𝐼)
125	15	snssd 4808	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → {𝑥} ⊆ 𝐼)
126		ssequn1 4176	. . . . . . . . . . . . . 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 2780	. . . . . . . . . . . 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 19873	. . . . . . . . . . 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 6962	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝑓 ↾ {𝑥}) = (𝑘 ∈ {𝑥} ↦ (𝑓‘𝑘)))
131	130	oveq2d 7430	. . . . . . . . . . . . 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 7089	. . . . . . . . . . . . . 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 19900	. . . . . . . . . . . . . 14 ⊢ ((𝐺 ∈ Mnd ∧ 𝑥 ∈ 𝐼 ∧ (𝑓‘𝑥) ∈ (Base‘𝐺)) → (𝐺 Σ_g (𝑘 ∈ {𝑥} ↦ (𝑓‘𝑘))) = (𝑓‘𝑥))
135	120, 15, 132, 134	syl3anc 1369	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺 Σ_g (𝑘 ∈ {𝑥} ↦ (𝑓‘𝑘))) = (𝑓‘𝑥))
136	131, 135	eqtrd 2767	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → (𝐺 Σ_g (𝑓 ↾ {𝑥})) = (𝑓‘𝑥))
137	136	oveq1d 7429	. . . . . . . . . . 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 2771	. . . . . . . . . 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 20002	. . . . . . . . . . . 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 2830	. . . . . . . . . . 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 19961	. . . . . . . . . . 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 19646	. . . . . . . . . 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 494	. . . . . . . 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 2767	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) ∧ 𝑥 ∈ 𝐼) → ((𝑃‘𝑥)‘𝐴) = (𝑓‘𝑥))
146	145	mpteq2dva 5242	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)) = (𝑥 ∈ 𝐼 ↦ (𝑓‘𝑥)))
147	118, 146	eqtr4d 2770	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝑓 = (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴)))
148	147	oveq2d 7430	. . . 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 2767	. . 3 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝑊 ∧ 𝐴 = (𝐺 Σ_g 𝑓))) → 𝐴 = (𝐺 Σ_g (𝑥 ∈ 𝐼 ↦ ((𝑃‘𝑥)‘𝐴))))
150	116, 149	jca 511	. 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 3156	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 395 = wceq 1534 ∈ wcel 2099 ∃wrex 3065 {crab 3427 Vcvv 3469 ∖ cdif 3941 ∪ cun 3942 ∩ cin 3943 ⊆ wss 3944 ∅c0 4318 {csn 4624 class class class wbr 5142 ↦ cmpt 5225 dom cdm 5672 ran crn 5673 ↾ cres 5674 Fun wfun 6536 ⟶wf 6538 ‘cfv 6542 (class class class)co 7414 supp csupp 8159 Xcixp 8907 finSupp cfsupp 9377 Basecbs 17171 +_gcplusg 17224 0_gc0g 17412 Σ_g cgsu 17413 Mndcmnd 18685 Grpcgrp 18881 SubGrpcsubg 19066 Cntzccntz 19257 LSSumclsm 19580 proj₁cpj1 19581 DProd cdprd 19941 dProjcdpj 19942

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2164 ax-ext 2698 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11186 ax-resscn 11187 ax-1cn 11188 ax-icn 11189 ax-addcl 11190 ax-addrcl 11191 ax-mulcl 11192 ax-mulrcl 11193 ax-mulcom 11194 ax-addass 11195 ax-mulass 11196 ax-distr 11197 ax-i2m1 11198 ax-1ne0 11199 ax-1rid 11200 ax-rnegex 11201 ax-rrecex 11202 ax-cnre 11203 ax-pre-lttri 11204 ax-pre-lttrn 11205 ax-pre-ltadd 11206 ax-pre-mulgt0 11207

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-nel 3042 df-ral 3057 df-rex 3066 df-rmo 3371 df-reu 3372 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-iin 4994 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-se 5628 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-isom 6551 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-of 7679 df-om 7865 df-1st 7987 df-2nd 7988 df-supp 8160 df-tpos 8225 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-er 8718 df-map 8838 df-ixp 8908 df-en 8956 df-dom 8957 df-sdom 8958 df-fin 8959 df-fsupp 9378 df-oi 9525 df-card 9954 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11468 df-neg 11469 df-nn 12235 df-2 12297 df-n0 12495 df-z 12581 df-uz 12845 df-fz 13509 df-fzo 13652 df-seq 13991 df-hash 14314 df-sets 17124 df-slot 17142 df-ndx 17154 df-base 17172 df-ress 17201 df-plusg 17237 df-0g 17414 df-gsum 17415 df-mre 17557 df-mrc 17558 df-acs 17560 df-mgm 18591 df-sgrp 18670 df-mnd 18686 df-mhm 18731 df-submnd 18732 df-grp 18884 df-minusg 18885 df-sbg 18886 df-mulg 19015 df-subg 19069 df-ghm 19159 df-gim 19204 df-cntz 19259 df-oppg 19288 df-lsm 19582 df-pj1 19583 df-cmn 19728 df-dprd 19943 df-dpj 19944

This theorem is referenced by: dpjeq 20007 dpjid 20008

W3C validator