Metamath Proof Explorer < Previous   Next > Nearby theorems Mirrors  >  Home  >  MPE Home  >  Th. List  >  madurid Structured version   Visualization version   GIF version

 Description: Multiplying a matrix with its adjunct results in the identity matrix multiplied with the determinant of the matrix. See Proposition 4.16 in [Lang] p. 518. (Contributed by Stefan O'Rear, 16-Jul-2018.)
Hypotheses
Ref Expression
madurid.a 𝐴 = (𝑁 Mat 𝑅)
madurid.b 𝐵 = (Base‘𝐴)
madurid.i 1 = (1r𝐴)
madurid.t · = (.r𝐴)
madurid.s = ( ·𝑠𝐴)
Assertion
Ref Expression
madurid ((𝑀𝐵𝑅 ∈ CRing) → (𝑀 · (𝐽𝑀)) = ((𝐷𝑀) 1 ))

Proof of Theorem madurid
Dummy variables 𝑎 𝑏 𝑐 𝑑 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqid 2821 . . 3 (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)
2 eqid 2821 . . 3 (Base‘𝑅) = (Base‘𝑅)
3 eqid 2821 . . 3 (.r𝑅) = (.r𝑅)
4 simpr 488 . . 3 ((𝑀𝐵𝑅 ∈ CRing) → 𝑅 ∈ CRing)
5 madurid.a . . . . . 6 𝐴 = (𝑁 Mat 𝑅)
6 madurid.b . . . . . 6 𝐵 = (Base‘𝐴)
75, 6matrcl 20996 . . . . 5 (𝑀𝐵 → (𝑁 ∈ Fin ∧ 𝑅 ∈ V))
87simpld 498 . . . 4 (𝑀𝐵𝑁 ∈ Fin)
98adantr 484 . . 3 ((𝑀𝐵𝑅 ∈ CRing) → 𝑁 ∈ Fin)
105, 2, 6matbas2i 21006 . . . 4 (𝑀𝐵𝑀 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
1110adantr 484 . . 3 ((𝑀𝐵𝑅 ∈ CRing) → 𝑀 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
12 madurid.j . . . . . . 7 𝐽 = (𝑁 maAdju 𝑅)
135, 12, 6maduf 21225 . . . . . 6 (𝑅 ∈ CRing → 𝐽:𝐵𝐵)
1413adantl 485 . . . . 5 ((𝑀𝐵𝑅 ∈ CRing) → 𝐽:𝐵𝐵)
15 simpl 486 . . . . 5 ((𝑀𝐵𝑅 ∈ CRing) → 𝑀𝐵)
1614, 15ffvelrnd 6825 . . . 4 ((𝑀𝐵𝑅 ∈ CRing) → (𝐽𝑀) ∈ 𝐵)
175, 2, 6matbas2i 21006 . . . 4 ((𝐽𝑀) ∈ 𝐵 → (𝐽𝑀) ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
1816, 17syl 17 . . 3 ((𝑀𝐵𝑅 ∈ CRing) → (𝐽𝑀) ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))
191, 2, 3, 4, 9, 9, 9, 11, 18mamuval 20972 . 2 ((𝑀𝐵𝑅 ∈ CRing) → (𝑀(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)(𝐽𝑀)) = (𝑎𝑁, 𝑏𝑁 ↦ (𝑅 Σg (𝑐𝑁 ↦ ((𝑎𝑀𝑐)(.r𝑅)(𝑐(𝐽𝑀)𝑏))))))
205, 1matmulr 21022 . . . . 5 ((𝑁 ∈ Fin ∧ 𝑅 ∈ CRing) → (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (.r𝐴))
218, 20sylan 583 . . . 4 ((𝑀𝐵𝑅 ∈ CRing) → (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = (.r𝐴))
22 madurid.t . . . 4 · = (.r𝐴)
2321, 22syl6eqr 2874 . . 3 ((𝑀𝐵𝑅 ∈ CRing) → (𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩) = · )
2423oveqd 7147 . 2 ((𝑀𝐵𝑅 ∈ CRing) → (𝑀(𝑅 maMul ⟨𝑁, 𝑁, 𝑁⟩)(𝐽𝑀)) = (𝑀 · (𝐽𝑀)))
25 madurid.d . . . . . 6 𝐷 = (𝑁 maDet 𝑅)
26 simp1l 1194 . . . . . 6 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) → 𝑀𝐵)
27 simp1r 1195 . . . . . 6 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) → 𝑅 ∈ CRing)
28 elmapi 8403 . . . . . . . . . 10 (𝑀 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)) → 𝑀:(𝑁 × 𝑁)⟶(Base‘𝑅))
2911, 28syl 17 . . . . . . . . 9 ((𝑀𝐵𝑅 ∈ CRing) → 𝑀:(𝑁 × 𝑁)⟶(Base‘𝑅))
30293ad2ant1 1130 . . . . . . . 8 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) → 𝑀:(𝑁 × 𝑁)⟶(Base‘𝑅))
3130adantr 484 . . . . . . 7 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ 𝑐𝑁) → 𝑀:(𝑁 × 𝑁)⟶(Base‘𝑅))
32 simpl2 1189 . . . . . . 7 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ 𝑐𝑁) → 𝑎𝑁)
33 simpr 488 . . . . . . 7 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ 𝑐𝑁) → 𝑐𝑁)
3431, 32, 33fovrnd 7295 . . . . . 6 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ 𝑐𝑁) → (𝑎𝑀𝑐) ∈ (Base‘𝑅))
35 simp3 1135 . . . . . 6 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) → 𝑏𝑁)
365, 12, 6, 25, 3, 2, 26, 27, 34, 35madugsum 21227 . . . . 5 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) → (𝑅 Σg (𝑐𝑁 ↦ ((𝑎𝑀𝑐)(.r𝑅)(𝑐(𝐽𝑀)𝑏)))) = (𝐷‘(𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))))
37 iftrue 4446 . . . . . . . . 9 (𝑎 = 𝑏 → if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅)) = (𝐷𝑀))
3837adantl 485 . . . . . . . 8 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎 = 𝑏) → if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅)) = (𝐷𝑀))
3929ffnd 6488 . . . . . . . . . . . 12 ((𝑀𝐵𝑅 ∈ CRing) → 𝑀 Fn (𝑁 × 𝑁))
40 fnov 7256 . . . . . . . . . . . 12 (𝑀 Fn (𝑁 × 𝑁) ↔ 𝑀 = (𝑑𝑁, 𝑐𝑁 ↦ (𝑑𝑀𝑐)))
4139, 40sylib 221 . . . . . . . . . . 11 ((𝑀𝐵𝑅 ∈ CRing) → 𝑀 = (𝑑𝑁, 𝑐𝑁 ↦ (𝑑𝑀𝑐)))
4241adantr 484 . . . . . . . . . 10 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎 = 𝑏) → 𝑀 = (𝑑𝑁, 𝑐𝑁 ↦ (𝑑𝑀𝑐)))
43 equtr2 2035 . . . . . . . . . . . . . . 15 ((𝑎 = 𝑏𝑑 = 𝑏) → 𝑎 = 𝑑)
4443oveq1d 7145 . . . . . . . . . . . . . 14 ((𝑎 = 𝑏𝑑 = 𝑏) → (𝑎𝑀𝑐) = (𝑑𝑀𝑐))
4544ifeq1da 4470 . . . . . . . . . . . . 13 (𝑎 = 𝑏 → if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)) = if(𝑑 = 𝑏, (𝑑𝑀𝑐), (𝑑𝑀𝑐)))
46 ifid 4479 . . . . . . . . . . . . 13 if(𝑑 = 𝑏, (𝑑𝑀𝑐), (𝑑𝑀𝑐)) = (𝑑𝑀𝑐)
4745, 46syl6eq 2872 . . . . . . . . . . . 12 (𝑎 = 𝑏 → if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)) = (𝑑𝑀𝑐))
4847adantl 485 . . . . . . . . . . 11 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎 = 𝑏) → if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)) = (𝑑𝑀𝑐))
4948mpoeq3dv 7207 . . . . . . . . . 10 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎 = 𝑏) → (𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐))) = (𝑑𝑁, 𝑐𝑁 ↦ (𝑑𝑀𝑐)))
5042, 49eqtr4d 2859 . . . . . . . . 9 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎 = 𝑏) → 𝑀 = (𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐))))
5150fveq2d 6647 . . . . . . . 8 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎 = 𝑏) → (𝐷𝑀) = (𝐷‘(𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))))
5238, 51eqtr2d 2857 . . . . . . 7 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎 = 𝑏) → (𝐷‘(𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))) = if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅)))
53523ad2antl1 1182 . . . . . 6 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ 𝑎 = 𝑏) → (𝐷‘(𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))) = if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅)))
54 eqid 2821 . . . . . . . 8 (0g𝑅) = (0g𝑅)
55 simpl1r 1222 . . . . . . . 8 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → 𝑅 ∈ CRing)
5693ad2ant1 1130 . . . . . . . . 9 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) → 𝑁 ∈ Fin)
5756adantr 484 . . . . . . . 8 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → 𝑁 ∈ Fin)
5830ad2antrr 725 . . . . . . . . 9 (((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) ∧ 𝑐𝑁) → 𝑀:(𝑁 × 𝑁)⟶(Base‘𝑅))
59 simpll2 1210 . . . . . . . . 9 (((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) ∧ 𝑐𝑁) → 𝑎𝑁)
60 simpr 488 . . . . . . . . 9 (((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) ∧ 𝑐𝑁) → 𝑐𝑁)
6158, 59, 60fovrnd 7295 . . . . . . . 8 (((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) ∧ 𝑐𝑁) → (𝑎𝑀𝑐) ∈ (Base‘𝑅))
6230adantr 484 . . . . . . . . . 10 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → 𝑀:(𝑁 × 𝑁)⟶(Base‘𝑅))
6362fovrnda 7294 . . . . . . . . 9 (((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) ∧ (𝑑𝑁𝑐𝑁)) → (𝑑𝑀𝑐) ∈ (Base‘𝑅))
64633impb 1112 . . . . . . . 8 (((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) ∧ 𝑑𝑁𝑐𝑁) → (𝑑𝑀𝑐) ∈ (Base‘𝑅))
65 simpl3 1190 . . . . . . . 8 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → 𝑏𝑁)
66 simpl2 1189 . . . . . . . 8 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → 𝑎𝑁)
67 neqne 3015 . . . . . . . . . 10 𝑎 = 𝑏𝑎𝑏)
6867necomd 3062 . . . . . . . . 9 𝑎 = 𝑏𝑏𝑎)
6968adantl 485 . . . . . . . 8 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → 𝑏𝑎)
7025, 2, 54, 55, 57, 61, 64, 65, 66, 69mdetralt2 21193 . . . . . . 7 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → (𝐷‘(𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), if(𝑑 = 𝑎, (𝑎𝑀𝑐), (𝑑𝑀𝑐))))) = (0g𝑅))
71 ifid 4479 . . . . . . . . . . 11 if(𝑑 = 𝑎, (𝑑𝑀𝑐), (𝑑𝑀𝑐)) = (𝑑𝑀𝑐)
72 oveq1 7137 . . . . . . . . . . . . 13 (𝑑 = 𝑎 → (𝑑𝑀𝑐) = (𝑎𝑀𝑐))
7372adantl 485 . . . . . . . . . . . 12 (((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) ∧ 𝑑 = 𝑎) → (𝑑𝑀𝑐) = (𝑎𝑀𝑐))
7473ifeq1da 4470 . . . . . . . . . . 11 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → if(𝑑 = 𝑎, (𝑑𝑀𝑐), (𝑑𝑀𝑐)) = if(𝑑 = 𝑎, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))
7571, 74syl5eqr 2870 . . . . . . . . . 10 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → (𝑑𝑀𝑐) = if(𝑑 = 𝑎, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))
7675ifeq2d 4459 . . . . . . . . 9 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)) = if(𝑑 = 𝑏, (𝑎𝑀𝑐), if(𝑑 = 𝑎, (𝑎𝑀𝑐), (𝑑𝑀𝑐))))
7776mpoeq3dv 7207 . . . . . . . 8 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → (𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐))) = (𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), if(𝑑 = 𝑎, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))))
7877fveq2d 6647 . . . . . . 7 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → (𝐷‘(𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))) = (𝐷‘(𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), if(𝑑 = 𝑎, (𝑎𝑀𝑐), (𝑑𝑀𝑐))))))
79 iffalse 4449 . . . . . . . 8 𝑎 = 𝑏 → if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅)) = (0g𝑅))
8079adantl 485 . . . . . . 7 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅)) = (0g𝑅))
8170, 78, 803eqtr4d 2866 . . . . . 6 ((((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) ∧ ¬ 𝑎 = 𝑏) → (𝐷‘(𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))) = if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅)))
8253, 81pm2.61dan 812 . . . . 5 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) → (𝐷‘(𝑑𝑁, 𝑐𝑁 ↦ if(𝑑 = 𝑏, (𝑎𝑀𝑐), (𝑑𝑀𝑐)))) = if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅)))
8336, 82eqtrd 2856 . . . 4 (((𝑀𝐵𝑅 ∈ CRing) ∧ 𝑎𝑁𝑏𝑁) → (𝑅 Σg (𝑐𝑁 ↦ ((𝑎𝑀𝑐)(.r𝑅)(𝑐(𝐽𝑀)𝑏)))) = if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅)))
8483mpoeq3dva 7205 . . 3 ((𝑀𝐵𝑅 ∈ CRing) → (𝑎𝑁, 𝑏𝑁 ↦ (𝑅 Σg (𝑐𝑁 ↦ ((𝑎𝑀𝑐)(.r𝑅)(𝑐(𝐽𝑀)𝑏))))) = (𝑎𝑁, 𝑏𝑁 ↦ if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅))))
85 madurid.i . . . . 5 1 = (1r𝐴)
8685oveq2i 7141 . . . 4 ((𝐷𝑀) 1 ) = ((𝐷𝑀) (1r𝐴))
87 crngring 19286 . . . . . 6 (𝑅 ∈ CRing → 𝑅 ∈ Ring)
8887adantl 485 . . . . 5 ((𝑀𝐵𝑅 ∈ CRing) → 𝑅 ∈ Ring)
8925, 5, 6, 2mdetf 21179 . . . . . . 7 (𝑅 ∈ CRing → 𝐷:𝐵⟶(Base‘𝑅))
9089adantl 485 . . . . . 6 ((𝑀𝐵𝑅 ∈ CRing) → 𝐷:𝐵⟶(Base‘𝑅))
9190, 15ffvelrnd 6825 . . . . 5 ((𝑀𝐵𝑅 ∈ CRing) → (𝐷𝑀) ∈ (Base‘𝑅))
92 madurid.s . . . . . 6 = ( ·𝑠𝐴)
935, 2, 92, 54matsc 21034 . . . . 5 ((𝑁 ∈ Fin ∧ 𝑅 ∈ Ring ∧ (𝐷𝑀) ∈ (Base‘𝑅)) → ((𝐷𝑀) (1r𝐴)) = (𝑎𝑁, 𝑏𝑁 ↦ if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅))))
949, 88, 91, 93syl3anc 1368 . . . 4 ((𝑀𝐵𝑅 ∈ CRing) → ((𝐷𝑀) (1r𝐴)) = (𝑎𝑁, 𝑏𝑁 ↦ if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅))))
9586, 94syl5eq 2868 . . 3 ((𝑀𝐵𝑅 ∈ CRing) → ((𝐷𝑀) 1 ) = (𝑎𝑁, 𝑏𝑁 ↦ if(𝑎 = 𝑏, (𝐷𝑀), (0g𝑅))))
9684, 95eqtr4d 2859 . 2 ((𝑀𝐵𝑅 ∈ CRing) → (𝑎𝑁, 𝑏𝑁 ↦ (𝑅 Σg (𝑐𝑁 ↦ ((𝑎𝑀𝑐)(.r𝑅)(𝑐(𝐽𝑀)𝑏))))) = ((𝐷𝑀) 1 ))
9719, 24, 963eqtr3d 2864 1 ((𝑀𝐵𝑅 ∈ CRing) → (𝑀 · (𝐽𝑀)) = ((𝐷𝑀) 1 ))