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Theorem dmatmul 21109
 Description: The product of two diagonal matrices. (Contributed by AV, 19-Aug-2019.) (Revised by AV, 18-Dec-2019.)
Hypotheses
Ref Expression
dmatid.a 𝐴 = (𝑁 Mat 𝑅)
dmatid.b 𝐵 = (Base‘𝐴)
dmatid.0 0 = (0g𝑅)
dmatid.d 𝐷 = (𝑁 DMat 𝑅)
Assertion
Ref Expression
dmatmul (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑋(.r𝐴)𝑌) = (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )))
Distinct variable groups:   𝑥,𝐷,𝑦   𝑥,𝑁,𝑦   𝑥,𝑅,𝑦   𝑥,𝑋,𝑦   𝑥,𝑌,𝑦
Allowed substitution hints:   𝐴(𝑥,𝑦)   𝐵(𝑥,𝑦)   0 (𝑥,𝑦)

Proof of Theorem dmatmul
Dummy variable 𝑘 is distinct from all other variables.
StepHypRef Expression
1 dmatid.a . . . . . 6 𝐴 = (𝑁 Mat 𝑅)
2 eqid 2798 . . . . . 6 (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)
31, 2matmulr 21050 . . . . 5 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (.r𝐴))
43adantr 484 . . . 4 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (.r𝐴))
54eqcomd 2804 . . 3 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (.r𝐴) = (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩))
65oveqd 7152 . 2 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑋(.r𝐴)𝑌) = (𝑋(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)𝑌))
7 eqid 2798 . . 3 (Base‘𝑅) = (Base‘𝑅)
8 eqid 2798 . . 3 (.r𝑅) = (.r𝑅)
9 simplr 768 . . 3 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑅 ∈ Ring)
10 simpll 766 . . 3 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑁 ∈ Fin)
11 dmatid.b . . . . . . 7 𝐵 = (Base‘𝐴)
12 dmatid.0 . . . . . . 7 0 = (0g𝑅)
13 dmatid.d . . . . . . 7 𝐷 = (𝑁 DMat 𝑅)
141, 11, 12, 13dmatmat 21106 . . . . . 6 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑋𝐷𝑋𝐵))
1514imp 410 . . . . 5 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ 𝑋𝐷) → 𝑋𝐵)
161, 7, 11matbas2i 21034 . . . . 5 (𝑋𝐵𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
1715, 16syl 17 . . . 4 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ 𝑋𝐷) → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
1817adantrr 716 . . 3 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
191, 11, 12, 13dmatmat 21106 . . . . . 6 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑌𝐷𝑌𝐵))
2019imp 410 . . . . 5 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ 𝑌𝐷) → 𝑌𝐵)
211, 7, 11matbas2i 21034 . . . . 5 (𝑌𝐵𝑌 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
2220, 21syl 17 . . . 4 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ 𝑌𝐷) → 𝑌 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
2322adantrl 715 . . 3 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑌 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
242, 7, 8, 9, 10, 10, 10, 18, 23mamuval 21000 . 2 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑋(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)𝑌) = (𝑥𝑁, 𝑦𝑁 ↦ (𝑅 Σg (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦))))))
25 eqid 2798 . . . . . . 7 (+g𝑅) = (+g𝑅)
26 ringcmn 19330 . . . . . . . . . 10 (𝑅 ∈ Ring → 𝑅 ∈ CMnd)
2726ad2antlr 726 . . . . . . . . 9 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑅 ∈ CMnd)
28273ad2ant1 1130 . . . . . . . 8 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑅 ∈ CMnd)
2928adantl 485 . . . . . . 7 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → 𝑅 ∈ CMnd)
30103ad2ant1 1130 . . . . . . . 8 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑁 ∈ Fin)
3130adantl 485 . . . . . . 7 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → 𝑁 ∈ Fin)
32 eqid 2798 . . . . . . . 8 (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦))) = (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)))
33 ovexd 7170 . . . . . . . 8 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) ∈ V)
34 fvexd 6660 . . . . . . . 8 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (0g𝑅) ∈ V)
3532, 31, 33, 34fsuppmptdm 8830 . . . . . . 7 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦))) finSupp (0g𝑅))
3693ad2ant1 1130 . . . . . . . . 9 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑅 ∈ Ring)
3736ad2antlr 726 . . . . . . . 8 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑅 ∈ Ring)
38 simp2 1134 . . . . . . . . . 10 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑥𝑁)
3938ad2antlr 726 . . . . . . . . 9 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑥𝑁)
40 simpr 488 . . . . . . . . 9 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑘𝑁)
41 eqid 2798 . . . . . . . . . . . . . 14 (Base‘𝐴) = (Base‘𝐴)
421, 41, 12, 13dmatmat 21106 . . . . . . . . . . . . 13 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑋𝐷𝑋 ∈ (Base‘𝐴)))
4342imp 410 . . . . . . . . . . . 12 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ 𝑋𝐷) → 𝑋 ∈ (Base‘𝐴))
4443adantrr 716 . . . . . . . . . . 11 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑋 ∈ (Base‘𝐴))
45443ad2ant1 1130 . . . . . . . . . 10 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑋 ∈ (Base‘𝐴))
4645ad2antlr 726 . . . . . . . . 9 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑋 ∈ (Base‘𝐴))
471, 7matecl 21037 . . . . . . . . 9 ((𝑥𝑁𝑘𝑁𝑋 ∈ (Base‘𝐴)) → (𝑥𝑋𝑘) ∈ (Base‘𝑅))
4839, 40, 46, 47syl3anc 1368 . . . . . . . 8 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → (𝑥𝑋𝑘) ∈ (Base‘𝑅))
49 simplr3 1214 . . . . . . . . 9 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑦𝑁)
501, 41, 12, 13dmatmat 21106 . . . . . . . . . . . . 13 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑌𝐷𝑌 ∈ (Base‘𝐴)))
5150imp 410 . . . . . . . . . . . 12 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ 𝑌𝐷) → 𝑌 ∈ (Base‘𝐴))
5251adantrl 715 . . . . . . . . . . 11 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑌 ∈ (Base‘𝐴))
53523ad2ant1 1130 . . . . . . . . . 10 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑌 ∈ (Base‘𝐴))
5453ad2antlr 726 . . . . . . . . 9 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑌 ∈ (Base‘𝐴))
551, 7matecl 21037 . . . . . . . . 9 ((𝑘𝑁𝑦𝑁𝑌 ∈ (Base‘𝐴)) → (𝑘𝑌𝑦) ∈ (Base‘𝑅))
5640, 49, 54, 55syl3anc 1368 . . . . . . . 8 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → (𝑘𝑌𝑦) ∈ (Base‘𝑅))
577, 8ringcl 19310 . . . . . . . 8 ((𝑅 ∈ Ring ∧ (𝑥𝑋𝑘) ∈ (Base‘𝑅) ∧ (𝑘𝑌𝑦) ∈ (Base‘𝑅)) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) ∈ (Base‘𝑅))
5837, 48, 56, 57syl3anc 1368 . . . . . . 7 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) ∈ (Base‘𝑅))
5938adantl 485 . . . . . . 7 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → 𝑥𝑁)
60 simp3 1135 . . . . . . . . . 10 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑦𝑁)
6115adantrr 716 . . . . . . . . . . . 12 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑋𝐵)
6261, 11eleqtrdi 2900 . . . . . . . . . . 11 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑋 ∈ (Base‘𝐴))
63623ad2ant1 1130 . . . . . . . . . 10 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑋 ∈ (Base‘𝐴))
641, 7matecl 21037 . . . . . . . . . 10 ((𝑥𝑁𝑦𝑁𝑋 ∈ (Base‘𝐴)) → (𝑥𝑋𝑦) ∈ (Base‘𝑅))
6538, 60, 63, 64syl3anc 1368 . . . . . . . . 9 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑥𝑋𝑦) ∈ (Base‘𝑅))
6650a1d 25 . . . . . . . . . . . 12 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑋𝐷 → (𝑌𝐷𝑌 ∈ (Base‘𝐴))))
6766imp32 422 . . . . . . . . . . 11 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑌 ∈ (Base‘𝐴))
68673ad2ant1 1130 . . . . . . . . . 10 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑌 ∈ (Base‘𝐴))
691, 7matecl 21037 . . . . . . . . . 10 ((𝑥𝑁𝑦𝑁𝑌 ∈ (Base‘𝐴)) → (𝑥𝑌𝑦) ∈ (Base‘𝑅))
7038, 60, 68, 69syl3anc 1368 . . . . . . . . 9 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑥𝑌𝑦) ∈ (Base‘𝑅))
717, 8ringcl 19310 . . . . . . . . 9 ((𝑅 ∈ Ring ∧ (𝑥𝑋𝑦) ∈ (Base‘𝑅) ∧ (𝑥𝑌𝑦) ∈ (Base‘𝑅)) → ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) ∈ (Base‘𝑅))
7236, 65, 70, 71syl3anc 1368 . . . . . . . 8 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) ∈ (Base‘𝑅))
7372adantl 485 . . . . . . 7 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) ∈ (Base‘𝑅))
74 eqtr 2818 . . . . . . . . . . 11 ((𝑘 = 𝑥𝑥 = 𝑦) → 𝑘 = 𝑦)
7574ancoms 462 . . . . . . . . . 10 ((𝑥 = 𝑦𝑘 = 𝑥) → 𝑘 = 𝑦)
7675oveq2d 7151 . . . . . . . . 9 ((𝑥 = 𝑦𝑘 = 𝑥) → (𝑥𝑋𝑘) = (𝑥𝑋𝑦))
7776adantlr 714 . . . . . . . 8 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 = 𝑥) → (𝑥𝑋𝑘) = (𝑥𝑋𝑦))
78 oveq1 7142 . . . . . . . . 9 (𝑘 = 𝑥 → (𝑘𝑌𝑦) = (𝑥𝑌𝑦))
7978adantl 485 . . . . . . . 8 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 = 𝑥) → (𝑘𝑌𝑦) = (𝑥𝑌𝑦))
8077, 79oveq12d 7153 . . . . . . 7 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 = 𝑥) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) = ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)))
817, 25, 29, 31, 35, 58, 59, 73, 80gsumdifsnd 19077 . . . . . 6 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 Σg (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)))) = ((𝑅 Σg (𝑘 ∈ (𝑁 ∖ {𝑥}) ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦))))(+g𝑅)((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦))))
82 simprl 770 . . . . . . . . . . . . . . . 16 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑋𝐷)
8310, 9, 823jca 1125 . . . . . . . . . . . . . . 15 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑋𝐷))
84833ad2ant1 1130 . . . . . . . . . . . . . 14 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑋𝐷))
8584ad2antlr 726 . . . . . . . . . . . . 13 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑋𝐷))
8638ad2antlr 726 . . . . . . . . . . . . 13 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → 𝑥𝑁)
87 eldifi 4054 . . . . . . . . . . . . . 14 (𝑘 ∈ (𝑁 ∖ {𝑥}) → 𝑘𝑁)
8887adantl 485 . . . . . . . . . . . . 13 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → 𝑘𝑁)
89 eldifsni 4683 . . . . . . . . . . . . . . 15 (𝑘 ∈ (𝑁 ∖ {𝑥}) → 𝑘𝑥)
9089necomd 3042 . . . . . . . . . . . . . 14 (𝑘 ∈ (𝑁 ∖ {𝑥}) → 𝑥𝑘)
9190adantl 485 . . . . . . . . . . . . 13 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → 𝑥𝑘)
921, 11, 12, 13dmatelnd 21108 . . . . . . . . . . . . 13 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑋𝐷) ∧ (𝑥𝑁𝑘𝑁𝑥𝑘)) → (𝑥𝑋𝑘) = 0 )
9385, 86, 88, 91, 92syl13anc 1369 . . . . . . . . . . . 12 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → (𝑥𝑋𝑘) = 0 )
9493oveq1d 7150 . . . . . . . . . . 11 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) = ( 0 (.r𝑅)(𝑘𝑌𝑦)))
9536ad2antlr 726 . . . . . . . . . . . 12 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → 𝑅 ∈ Ring)
96 simplr3 1214 . . . . . . . . . . . . 13 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → 𝑦𝑁)
9753ad2antlr 726 . . . . . . . . . . . . 13 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → 𝑌 ∈ (Base‘𝐴))
9888, 96, 97, 55syl3anc 1368 . . . . . . . . . . . 12 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → (𝑘𝑌𝑦) ∈ (Base‘𝑅))
997, 8, 12ringlz 19336 . . . . . . . . . . . 12 ((𝑅 ∈ Ring ∧ (𝑘𝑌𝑦) ∈ (Base‘𝑅)) → ( 0 (.r𝑅)(𝑘𝑌𝑦)) = 0 )
10095, 98, 99syl2anc 587 . . . . . . . . . . 11 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → ( 0 (.r𝑅)(𝑘𝑌𝑦)) = 0 )
10194, 100eqtrd 2833 . . . . . . . . . 10 (((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘 ∈ (𝑁 ∖ {𝑥})) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) = 0 )
102101mpteq2dva 5125 . . . . . . . . 9 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑘 ∈ (𝑁 ∖ {𝑥}) ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦))) = (𝑘 ∈ (𝑁 ∖ {𝑥}) ↦ 0 ))
103102oveq2d 7151 . . . . . . . 8 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 Σg (𝑘 ∈ (𝑁 ∖ {𝑥}) ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)))) = (𝑅 Σg (𝑘 ∈ (𝑁 ∖ {𝑥}) ↦ 0 )))
104 diffi 8736 . . . . . . . . . . . . 13 (𝑁 ∈ Fin → (𝑁 ∖ {𝑥}) ∈ Fin)
105 ringmnd 19303 . . . . . . . . . . . . 13 (𝑅 ∈ Ring → 𝑅 ∈ Mnd)
106104, 105anim12ci 616 . . . . . . . . . . . 12 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑅 ∈ Mnd ∧ (𝑁 ∖ {𝑥}) ∈ Fin))
107106adantr 484 . . . . . . . . . . 11 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑅 ∈ Mnd ∧ (𝑁 ∖ {𝑥}) ∈ Fin))
1081073ad2ant1 1130 . . . . . . . . . 10 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑅 ∈ Mnd ∧ (𝑁 ∖ {𝑥}) ∈ Fin))
109108adantl 485 . . . . . . . . 9 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 ∈ Mnd ∧ (𝑁 ∖ {𝑥}) ∈ Fin))
11012gsumz 17994 . . . . . . . . 9 ((𝑅 ∈ Mnd ∧ (𝑁 ∖ {𝑥}) ∈ Fin) → (𝑅 Σg (𝑘 ∈ (𝑁 ∖ {𝑥}) ↦ 0 )) = 0 )
111109, 110syl 17 . . . . . . . 8 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 Σg (𝑘 ∈ (𝑁 ∖ {𝑥}) ↦ 0 )) = 0 )
112103, 111eqtrd 2833 . . . . . . 7 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 Σg (𝑘 ∈ (𝑁 ∖ {𝑥}) ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)))) = 0 )
113112oveq1d 7150 . . . . . 6 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → ((𝑅 Σg (𝑘 ∈ (𝑁 ∖ {𝑥}) ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦))))(+g𝑅)((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦))) = ( 0 (+g𝑅)((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦))))
114105ad2antlr 726 . . . . . . . . . 10 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑅 ∈ Mnd)
1151143ad2ant1 1130 . . . . . . . . 9 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑅 ∈ Mnd)
11638, 60, 53, 69syl3anc 1368 . . . . . . . . . 10 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑥𝑌𝑦) ∈ (Base‘𝑅))
11736, 65, 116, 71syl3anc 1368 . . . . . . . . 9 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) ∈ (Base‘𝑅))
118115, 117jca 515 . . . . . . . 8 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑅 ∈ Mnd ∧ ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) ∈ (Base‘𝑅)))
119118adantl 485 . . . . . . 7 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 ∈ Mnd ∧ ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) ∈ (Base‘𝑅)))
1207, 25, 12mndlid 17925 . . . . . . 7 ((𝑅 ∈ Mnd ∧ ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) ∈ (Base‘𝑅)) → ( 0 (+g𝑅)((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦))) = ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)))
121119, 120syl 17 . . . . . 6 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → ( 0 (+g𝑅)((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦))) = ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)))
12281, 113, 1213eqtrd 2837 . . . . 5 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 Σg (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)))) = ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)))
123 iftrue 4431 . . . . . 6 (𝑥 = 𝑦 → if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ) = ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)))
124123adantr 484 . . . . 5 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ) = ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)))
125122, 124eqtr4d 2836 . . . 4 ((𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 Σg (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)))) = if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))
126 simprr 772 . . . . . . . . . . . . . . 15 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑌𝐷)
12710, 9, 1263jca 1125 . . . . . . . . . . . . . 14 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑌𝐷))
1281273ad2ant1 1130 . . . . . . . . . . . . 13 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑌𝐷))
129128ad2antlr 726 . . . . . . . . . . . 12 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑌𝐷))
130129adantl 485 . . . . . . . . . . 11 ((𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑌𝐷))
131 simprr 772 . . . . . . . . . . 11 ((𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → 𝑘𝑁)
132 simplr3 1214 . . . . . . . . . . . 12 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑦𝑁)
133132adantl 485 . . . . . . . . . . 11 ((𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → 𝑦𝑁)
134 df-ne 2988 . . . . . . . . . . . . . . 15 (𝑥𝑦 ↔ ¬ 𝑥 = 𝑦)
135 neeq1 3049 . . . . . . . . . . . . . . . 16 (𝑥 = 𝑘 → (𝑥𝑦𝑘𝑦))
136135biimpcd 252 . . . . . . . . . . . . . . 15 (𝑥𝑦 → (𝑥 = 𝑘𝑘𝑦))
137134, 136sylbir 238 . . . . . . . . . . . . . 14 𝑥 = 𝑦 → (𝑥 = 𝑘𝑘𝑦))
138137adantr 484 . . . . . . . . . . . . 13 ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑥 = 𝑘𝑘𝑦))
139138adantr 484 . . . . . . . . . . . 12 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → (𝑥 = 𝑘𝑘𝑦))
140139impcom 411 . . . . . . . . . . 11 ((𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → 𝑘𝑦)
1411, 11, 12, 13dmatelnd 21108 . . . . . . . . . . 11 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑌𝐷) ∧ (𝑘𝑁𝑦𝑁𝑘𝑦)) → (𝑘𝑌𝑦) = 0 )
142130, 131, 133, 140, 141syl13anc 1369 . . . . . . . . . 10 ((𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → (𝑘𝑌𝑦) = 0 )
143142oveq2d 7151 . . . . . . . . 9 ((𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) = ((𝑥𝑋𝑘)(.r𝑅) 0 ))
14436ad2antlr 726 . . . . . . . . . . 11 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑅 ∈ Ring)
14538ad2antlr 726 . . . . . . . . . . . 12 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑥𝑁)
146 simpr 488 . . . . . . . . . . . 12 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑘𝑁)
14763ad2antlr 726 . . . . . . . . . . . 12 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑋 ∈ (Base‘𝐴))
148145, 146, 147, 47syl3anc 1368 . . . . . . . . . . 11 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → (𝑥𝑋𝑘) ∈ (Base‘𝑅))
1497, 8, 12ringrz 19337 . . . . . . . . . . 11 ((𝑅 ∈ Ring ∧ (𝑥𝑋𝑘) ∈ (Base‘𝑅)) → ((𝑥𝑋𝑘)(.r𝑅) 0 ) = 0 )
150144, 148, 149syl2anc 587 . . . . . . . . . 10 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → ((𝑥𝑋𝑘)(.r𝑅) 0 ) = 0 )
151150adantl 485 . . . . . . . . 9 ((𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → ((𝑥𝑋𝑘)(.r𝑅) 0 ) = 0 )
152143, 151eqtrd 2833 . . . . . . . 8 ((𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) = 0 )
15384ad2antlr 726 . . . . . . . . . . . 12 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑋𝐷))
154153adantl 485 . . . . . . . . . . 11 ((¬ 𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ 𝑋𝐷))
155145adantl 485 . . . . . . . . . . 11 ((¬ 𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → 𝑥𝑁)
156 simprr 772 . . . . . . . . . . 11 ((¬ 𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → 𝑘𝑁)
157 neqne 2995 . . . . . . . . . . . 12 𝑥 = 𝑘𝑥𝑘)
158157adantr 484 . . . . . . . . . . 11 ((¬ 𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → 𝑥𝑘)
159154, 155, 156, 158, 92syl13anc 1369 . . . . . . . . . 10 ((¬ 𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → (𝑥𝑋𝑘) = 0 )
160159oveq1d 7150 . . . . . . . . 9 ((¬ 𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) = ( 0 (.r𝑅)(𝑘𝑌𝑦)))
16168ad2antlr 726 . . . . . . . . . . . 12 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → 𝑌 ∈ (Base‘𝐴))
162146, 132, 161, 55syl3anc 1368 . . . . . . . . . . 11 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → (𝑘𝑌𝑦) ∈ (Base‘𝑅))
163144, 162, 99syl2anc 587 . . . . . . . . . 10 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → ( 0 (.r𝑅)(𝑘𝑌𝑦)) = 0 )
164163adantl 485 . . . . . . . . 9 ((¬ 𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → ( 0 (.r𝑅)(𝑘𝑌𝑦)) = 0 )
165160, 164eqtrd 2833 . . . . . . . 8 ((¬ 𝑥 = 𝑘 ∧ ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁)) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) = 0 )
166152, 165pm2.61ian 811 . . . . . . 7 (((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) ∧ 𝑘𝑁) → ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)) = 0 )
167166mpteq2dva 5125 . . . . . 6 ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦))) = (𝑘𝑁0 ))
168167oveq2d 7151 . . . . 5 ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 Σg (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)))) = (𝑅 Σg (𝑘𝑁0 )))
169105anim2i 619 . . . . . . . . . 10 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑁 ∈ Fin ∧ 𝑅 ∈ Mnd))
170169ancomd 465 . . . . . . . . 9 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑅 ∈ Mnd ∧ 𝑁 ∈ Fin))
17112gsumz 17994 . . . . . . . . 9 ((𝑅 ∈ Mnd ∧ 𝑁 ∈ Fin) → (𝑅 Σg (𝑘𝑁0 )) = 0 )
172170, 171syl 17 . . . . . . . 8 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑅 Σg (𝑘𝑁0 )) = 0 )
173172adantr 484 . . . . . . 7 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑅 Σg (𝑘𝑁0 )) = 0 )
1741733ad2ant1 1130 . . . . . 6 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑅 Σg (𝑘𝑁0 )) = 0 )
175174adantl 485 . . . . 5 ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 Σg (𝑘𝑁0 )) = 0 )
176 iffalse 4434 . . . . . . 7 𝑥 = 𝑦 → if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ) = 0 )
177176eqcomd 2804 . . . . . 6 𝑥 = 𝑦0 = if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))
178177adantr 484 . . . . 5 ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → 0 = if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))
179168, 175, 1783eqtrd 2837 . . . 4 ((¬ 𝑥 = 𝑦 ∧ (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁)) → (𝑅 Σg (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)))) = if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))
180125, 179pm2.61ian 811 . . 3 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑅 Σg (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦)))) = if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))
181180mpoeq3dva 7210 . 2 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑥𝑁, 𝑦𝑁 ↦ (𝑅 Σg (𝑘𝑁 ↦ ((𝑥𝑋𝑘)(.r𝑅)(𝑘𝑌𝑦))))) = (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )))
1826, 24, 1813eqtrd 2837 1 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑋(.r𝐴)𝑌) = (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 399   ∧ w3a 1084   = wceq 1538   ∈ wcel 2111   ≠ wne 2987  Vcvv 3441   ∖ cdif 3878  ifcif 4425  {csn 4525  ⟨cotp 4533   ↦ cmpt 5110   × cxp 5517  ‘cfv 6324  (class class class)co 7135   ∈ cmpo 7137   ↑m cmap 8391  Fincfn 8494  Basecbs 16477  +gcplusg 16559  .rcmulr 16560  0gc0g 16707   Σg cgsu 16708  Mndcmnd 17905  CMndccmn 18901  Ringcrg 19293   maMul cmmul 20997   Mat cmat 21019   DMat cdmat 21100 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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-rep 5154  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295  ax-un 7443  ax-cnex 10584  ax-resscn 10585  ax-1cn 10586  ax-icn 10587  ax-addcl 10588  ax-addrcl 10589  ax-mulcl 10590  ax-mulrcl 10591  ax-mulcom 10592  ax-addass 10593  ax-mulass 10594  ax-distr 10595  ax-i2m1 10596  ax-1ne0 10597  ax-1rid 10598  ax-rnegex 10599  ax-rrecex 10600  ax-cnre 10601  ax-pre-lttri 10602  ax-pre-lttrn 10603  ax-pre-ltadd 10604  ax-pre-mulgt0 10605 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-nel 3092  df-ral 3111  df-rex 3112  df-reu 3113  df-rmo 3114  df-rab 3115  df-v 3443  df-sbc 3721  df-csb 3829  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-pss 3900  df-nul 4244  df-if 4426  df-pw 4499  df-sn 4526  df-pr 4528  df-tp 4530  df-op 4532  df-ot 4534  df-uni 4801  df-int 4839  df-iun 4883  df-iin 4884  df-br 5031  df-opab 5093  df-mpt 5111  df-tr 5137  df-id 5425  df-eprel 5430  df-po 5438  df-so 5439  df-fr 5478  df-se 5479  df-we 5480  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-res 5531  df-ima 5532  df-pred 6116  df-ord 6162  df-on 6163  df-lim 6164  df-suc 6165  df-iota 6283  df-fun 6326  df-fn 6327  df-f 6328  df-f1 6329  df-fo 6330  df-f1o 6331  df-fv 6332  df-isom 6333  df-riota 7093  df-ov 7138  df-oprab 7139  df-mpo 7140  df-of 7390  df-om 7563  df-1st 7673  df-2nd 7674  df-supp 7816  df-wrecs 7932  df-recs 7993  df-rdg 8031  df-1o 8087  df-oadd 8091  df-er 8274  df-map 8393  df-ixp 8447  df-en 8495  df-dom 8496  df-sdom 8497  df-fin 8498  df-fsupp 8820  df-sup 8892  df-oi 8960  df-card 9354  df-pnf 10668  df-mnf 10669  df-xr 10670  df-ltxr 10671  df-le 10672  df-sub 10863  df-neg 10864  df-nn 11628  df-2 11690  df-3 11691  df-4 11692  df-5 11693  df-6 11694  df-7 11695  df-8 11696  df-9 11697  df-n0 11888  df-z 11972  df-dec 12089  df-uz 12234  df-fz 12888  df-fzo 13031  df-seq 13367  df-hash 13689  df-struct 16479  df-ndx 16480  df-slot 16481  df-base 16483  df-sets 16484  df-ress 16485  df-plusg 16572  df-mulr 16573  df-sca 16575  df-vsca 16576  df-ip 16577  df-tset 16578  df-ple 16579  df-ds 16581  df-hom 16583  df-cco 16584  df-0g 16709  df-gsum 16710  df-prds 16715  df-pws 16717  df-mre 16851  df-mrc 16852  df-acs 16854  df-mgm 17846  df-sgrp 17895  df-mnd 17906  df-submnd 17951  df-grp 18100  df-minusg 18101  df-mulg 18220  df-cntz 18442  df-cmn 18903  df-abl 18904  df-mgp 19236  df-ur 19248  df-ring 19295  df-sra 19940  df-rgmod 19941  df-dsmm 20425  df-frlm 20440  df-mamu 20998  df-mat 21020  df-dmat 21102 This theorem is referenced by:  dmatmulcl  21112  dmatcrng  21114  scmatscmiddistr  21120  scmatcrng  21133
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