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Theorem dmatmulcl 20063
Description: The product of two diagonal matrices is a diagonal matrix. (Contributed by AV, 20-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
dmatmulcl (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑋(.r𝐴)𝑌) ∈ 𝐷)

Proof of Theorem dmatmulcl
Dummy variables 𝑖 𝑗 𝑥 𝑦 𝑚 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 dmatid.a . . . 4 𝐴 = (𝑁 Mat 𝑅)
2 eqid 2605 . . . 4 (Base‘𝑅) = (Base‘𝑅)
3 dmatid.b . . . 4 𝐵 = (Base‘𝐴)
4 simpll 785 . . . 4 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑁 ∈ Fin)
5 simplr 787 . . . 4 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑅 ∈ Ring)
653ad2ant1 1074 . . . . . 6 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑅 ∈ Ring)
7 eqid 2605 . . . . . . 7 (Base‘𝐴) = (Base‘𝐴)
8 simp2 1054 . . . . . . 7 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑥𝑁)
9 simp3 1055 . . . . . . 7 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑦𝑁)
10 dmatid.0 . . . . . . . . . . 11 0 = (0g𝑅)
11 dmatid.d . . . . . . . . . . 11 𝐷 = (𝑁 DMat 𝑅)
121, 7, 10, 11dmatmat 20057 . . . . . . . . . 10 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑋𝐷𝑋 ∈ (Base‘𝐴)))
1312imp 443 . . . . . . . . 9 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ 𝑋𝐷) → 𝑋 ∈ (Base‘𝐴))
1413adantrr 748 . . . . . . . 8 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑋 ∈ (Base‘𝐴))
15143ad2ant1 1074 . . . . . . 7 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑋 ∈ (Base‘𝐴))
161, 2, 7, 8, 9, 15matecld 19989 . . . . . 6 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑥𝑋𝑦) ∈ (Base‘𝑅))
171, 7, 10, 11dmatmat 20057 . . . . . . . . . 10 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → (𝑌𝐷𝑌 ∈ (Base‘𝐴)))
1817imp 443 . . . . . . . . 9 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ 𝑌𝐷) → 𝑌 ∈ (Base‘𝐴))
1918adantrl 747 . . . . . . . 8 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝑌 ∈ (Base‘𝐴))
20193ad2ant1 1074 . . . . . . 7 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 𝑌 ∈ (Base‘𝐴))
211, 2, 7, 8, 9, 20matecld 19989 . . . . . 6 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → (𝑥𝑌𝑦) ∈ (Base‘𝑅))
22 eqid 2605 . . . . . . 7 (.r𝑅) = (.r𝑅)
232, 22ringcl 18326 . . . . . 6 ((𝑅 ∈ Ring ∧ (𝑥𝑋𝑦) ∈ (Base‘𝑅) ∧ (𝑥𝑌𝑦) ∈ (Base‘𝑅)) → ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) ∈ (Base‘𝑅))
246, 16, 21, 23syl3anc 1317 . . . . 5 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) ∈ (Base‘𝑅))
252, 10ring0cl 18334 . . . . . . . 8 (𝑅 ∈ Ring → 0 ∈ (Base‘𝑅))
2625adantl 480 . . . . . . 7 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → 0 ∈ (Base‘𝑅))
2726adantr 479 . . . . . 6 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 0 ∈ (Base‘𝑅))
28273ad2ant1 1074 . . . . 5 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → 0 ∈ (Base‘𝑅))
2924, 28ifcld 4076 . . . 4 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ 𝑥𝑁𝑦𝑁) → if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ) ∈ (Base‘𝑅))
301, 2, 3, 4, 5, 29matbas2d 19986 . . 3 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )) ∈ 𝐵)
31 eqidd 2606 . . . . . . 7 (((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ (𝑖𝑁𝑗𝑁)) ∧ 𝑖𝑗) → (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )) = (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )))
32 eqeq12 2618 . . . . . . . . 9 ((𝑥 = 𝑖𝑦 = 𝑗) → (𝑥 = 𝑦𝑖 = 𝑗))
33 oveq12 6532 . . . . . . . . . 10 ((𝑥 = 𝑖𝑦 = 𝑗) → (𝑥𝑋𝑦) = (𝑖𝑋𝑗))
34 oveq12 6532 . . . . . . . . . 10 ((𝑥 = 𝑖𝑦 = 𝑗) → (𝑥𝑌𝑦) = (𝑖𝑌𝑗))
3533, 34oveq12d 6541 . . . . . . . . 9 ((𝑥 = 𝑖𝑦 = 𝑗) → ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)) = ((𝑖𝑋𝑗)(.r𝑅)(𝑖𝑌𝑗)))
3632, 35ifbieq1d 4054 . . . . . . . 8 ((𝑥 = 𝑖𝑦 = 𝑗) → if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ) = if(𝑖 = 𝑗, ((𝑖𝑋𝑗)(.r𝑅)(𝑖𝑌𝑗)), 0 ))
3736adantl 480 . . . . . . 7 ((((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ (𝑖𝑁𝑗𝑁)) ∧ 𝑖𝑗) ∧ (𝑥 = 𝑖𝑦 = 𝑗)) → if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ) = if(𝑖 = 𝑗, ((𝑖𝑋𝑗)(.r𝑅)(𝑖𝑌𝑗)), 0 ))
38 simplrl 795 . . . . . . 7 (((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ (𝑖𝑁𝑗𝑁)) ∧ 𝑖𝑗) → 𝑖𝑁)
39 simplrr 796 . . . . . . 7 (((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ (𝑖𝑁𝑗𝑁)) ∧ 𝑖𝑗) → 𝑗𝑁)
40 ovex 6551 . . . . . . . . 9 ((𝑖𝑋𝑗)(.r𝑅)(𝑖𝑌𝑗)) ∈ V
41 fvex 6094 . . . . . . . . . 10 (0g𝑅) ∈ V
4210, 41eqeltri 2679 . . . . . . . . 9 0 ∈ V
4340, 42ifex 4101 . . . . . . . 8 if(𝑖 = 𝑗, ((𝑖𝑋𝑗)(.r𝑅)(𝑖𝑌𝑗)), 0 ) ∈ V
4443a1i 11 . . . . . . 7 (((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ (𝑖𝑁𝑗𝑁)) ∧ 𝑖𝑗) → if(𝑖 = 𝑗, ((𝑖𝑋𝑗)(.r𝑅)(𝑖𝑌𝑗)), 0 ) ∈ V)
4531, 37, 38, 39, 44ovmpt2d 6660 . . . . . 6 (((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ (𝑖𝑁𝑗𝑁)) ∧ 𝑖𝑗) → (𝑖(𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))𝑗) = if(𝑖 = 𝑗, ((𝑖𝑋𝑗)(.r𝑅)(𝑖𝑌𝑗)), 0 ))
46 ifnefalse 4043 . . . . . . 7 (𝑖𝑗 → if(𝑖 = 𝑗, ((𝑖𝑋𝑗)(.r𝑅)(𝑖𝑌𝑗)), 0 ) = 0 )
4746adantl 480 . . . . . 6 (((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ (𝑖𝑁𝑗𝑁)) ∧ 𝑖𝑗) → if(𝑖 = 𝑗, ((𝑖𝑋𝑗)(.r𝑅)(𝑖𝑌𝑗)), 0 ) = 0 )
4845, 47eqtrd 2639 . . . . 5 (((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ (𝑖𝑁𝑗𝑁)) ∧ 𝑖𝑗) → (𝑖(𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))𝑗) = 0 )
4948ex 448 . . . 4 ((((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) ∧ (𝑖𝑁𝑗𝑁)) → (𝑖𝑗 → (𝑖(𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))𝑗) = 0 ))
5049ralrimivva 2949 . . 3 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → ∀𝑖𝑁𝑗𝑁 (𝑖𝑗 → (𝑖(𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))𝑗) = 0 ))
51 oveq 6529 . . . . . . 7 (𝑚 = (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )) → (𝑖𝑚𝑗) = (𝑖(𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))𝑗))
5251eqeq1d 2607 . . . . . 6 (𝑚 = (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )) → ((𝑖𝑚𝑗) = 0 ↔ (𝑖(𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))𝑗) = 0 ))
5352imbi2d 328 . . . . 5 (𝑚 = (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )) → ((𝑖𝑗 → (𝑖𝑚𝑗) = 0 ) ↔ (𝑖𝑗 → (𝑖(𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))𝑗) = 0 )))
54532ralbidv 2967 . . . 4 (𝑚 = (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )) → (∀𝑖𝑁𝑗𝑁 (𝑖𝑗 → (𝑖𝑚𝑗) = 0 ) ↔ ∀𝑖𝑁𝑗𝑁 (𝑖𝑗 → (𝑖(𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))𝑗) = 0 )))
5554elrab 3326 . . 3 ((𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )) ∈ {𝑚𝐵 ∣ ∀𝑖𝑁𝑗𝑁 (𝑖𝑗 → (𝑖𝑚𝑗) = 0 )} ↔ ((𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )) ∈ 𝐵 ∧ ∀𝑖𝑁𝑗𝑁 (𝑖𝑗 → (𝑖(𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 ))𝑗) = 0 )))
5630, 50, 55sylanbrc 694 . 2 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )) ∈ {𝑚𝐵 ∣ ∀𝑖𝑁𝑗𝑁 (𝑖𝑗 → (𝑖𝑚𝑗) = 0 )})
571, 3, 10, 11dmatmul 20060 . 2 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑋(.r𝐴)𝑌) = (𝑥𝑁, 𝑦𝑁 ↦ if(𝑥 = 𝑦, ((𝑥𝑋𝑦)(.r𝑅)(𝑥𝑌𝑦)), 0 )))
581, 3, 10, 11dmatval 20055 . . 3 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) → 𝐷 = {𝑚𝐵 ∣ ∀𝑖𝑁𝑗𝑁 (𝑖𝑗 → (𝑖𝑚𝑗) = 0 )})
5958adantr 479 . 2 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → 𝐷 = {𝑚𝐵 ∣ ∀𝑖𝑁𝑗𝑁 (𝑖𝑗 → (𝑖𝑚𝑗) = 0 )})
6056, 57, 593eltr4d 2698 1 (((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring) ∧ (𝑋𝐷𝑌𝐷)) → (𝑋(.r𝐴)𝑌) ∈ 𝐷)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 382  w3a 1030   = wceq 1474  wcel 1975  wne 2775  wral 2891  {crab 2895  Vcvv 3168  ifcif 4031  cfv 5786  (class class class)co 6523  cmpt2 6525  Fincfn 7814  Basecbs 15637  .rcmulr 15711  0gc0g 15865  Ringcrg 18312   Mat cmat 19970   DMat cdmat 20051
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1711  ax-4 1726  ax-5 1825  ax-6 1873  ax-7 1920  ax-8 1977  ax-9 1984  ax-10 2004  ax-11 2019  ax-12 2031  ax-13 2228  ax-ext 2585  ax-rep 4689  ax-sep 4699  ax-nul 4708  ax-pow 4760  ax-pr 4824  ax-un 6820  ax-inf2 8394  ax-cnex 9844  ax-resscn 9845  ax-1cn 9846  ax-icn 9847  ax-addcl 9848  ax-addrcl 9849  ax-mulcl 9850  ax-mulrcl 9851  ax-mulcom 9852  ax-addass 9853  ax-mulass 9854  ax-distr 9855  ax-i2m1 9856  ax-1ne0 9857  ax-1rid 9858  ax-rnegex 9859  ax-rrecex 9860  ax-cnre 9861  ax-pre-lttri 9862  ax-pre-lttrn 9863  ax-pre-ltadd 9864  ax-pre-mulgt0 9865
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3or 1031  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1700  df-sb 1866  df-eu 2457  df-mo 2458  df-clab 2592  df-cleq 2598  df-clel 2601  df-nfc 2735  df-ne 2777  df-nel 2778  df-ral 2896  df-rex 2897  df-reu 2898  df-rmo 2899  df-rab 2900  df-v 3170  df-sbc 3398  df-csb 3495  df-dif 3538  df-un 3540  df-in 3542  df-ss 3549  df-pss 3551  df-nul 3870  df-if 4032  df-pw 4105  df-sn 4121  df-pr 4123  df-tp 4125  df-op 4127  df-ot 4129  df-uni 4363  df-int 4401  df-iun 4447  df-iin 4448  df-br 4574  df-opab 4634  df-mpt 4635  df-tr 4671  df-eprel 4935  df-id 4939  df-po 4945  df-so 4946  df-fr 4983  df-se 4984  df-we 4985  df-xp 5030  df-rel 5031  df-cnv 5032  df-co 5033  df-dm 5034  df-rn 5035  df-res 5036  df-ima 5037  df-pred 5579  df-ord 5625  df-on 5626  df-lim 5627  df-suc 5628  df-iota 5750  df-fun 5788  df-fn 5789  df-f 5790  df-f1 5791  df-fo 5792  df-f1o 5793  df-fv 5794  df-isom 5795  df-riota 6485  df-ov 6526  df-oprab 6527  df-mpt2 6528  df-of 6768  df-om 6931  df-1st 7032  df-2nd 7033  df-supp 7156  df-wrecs 7267  df-recs 7328  df-rdg 7366  df-1o 7420  df-oadd 7424  df-er 7602  df-map 7719  df-ixp 7768  df-en 7815  df-dom 7816  df-sdom 7817  df-fin 7818  df-fsupp 8132  df-sup 8204  df-oi 8271  df-card 8621  df-pnf 9928  df-mnf 9929  df-xr 9930  df-ltxr 9931  df-le 9932  df-sub 10115  df-neg 10116  df-nn 10864  df-2 10922  df-3 10923  df-4 10924  df-5 10925  df-6 10926  df-7 10927  df-8 10928  df-9 10929  df-n0 11136  df-z 11207  df-dec 11322  df-uz 11516  df-fz 12149  df-fzo 12286  df-seq 12615  df-hash 12931  df-struct 15639  df-ndx 15640  df-slot 15641  df-base 15642  df-sets 15643  df-ress 15644  df-plusg 15723  df-mulr 15724  df-sca 15726  df-vsca 15727  df-ip 15728  df-tset 15729  df-ple 15730  df-ds 15733  df-hom 15735  df-cco 15736  df-0g 15867  df-gsum 15868  df-prds 15873  df-pws 15875  df-mre 16011  df-mrc 16012  df-acs 16014  df-mgm 17007  df-sgrp 17049  df-mnd 17060  df-submnd 17101  df-grp 17190  df-minusg 17191  df-mulg 17306  df-cntz 17515  df-cmn 17960  df-abl 17961  df-mgp 18255  df-ur 18267  df-ring 18314  df-sra 18935  df-rgmod 18936  df-dsmm 19833  df-frlm 19848  df-mamu 19947  df-mat 19971  df-dmat 20053
This theorem is referenced by:  dmatsrng  20064
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