Step | Hyp | Ref
| Expression |
1 | | cramerimp.m |
. . 3
⊢ × =
(𝑅 maMul 〈𝑁, 𝑁, 𝑁〉) |
2 | | eqid 2738 |
. . 3
⊢
(Base‘𝑅) =
(Base‘𝑅) |
3 | | eqid 2738 |
. . 3
⊢
(.r‘𝑅) = (.r‘𝑅) |
4 | | simpl 483 |
. . . 4
⊢ ((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) → 𝑅 ∈ CRing) |
5 | 4 | 3ad2ant1 1132 |
. . 3
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝑅 ∈ CRing) |
6 | | cramerimp.a |
. . . . . . 7
⊢ 𝐴 = (𝑁 Mat 𝑅) |
7 | | cramerimp.b |
. . . . . . 7
⊢ 𝐵 = (Base‘𝐴) |
8 | 6, 7 | matrcl 21559 |
. . . . . 6
⊢ (𝑋 ∈ 𝐵 → (𝑁 ∈ Fin ∧ 𝑅 ∈ V)) |
9 | 8 | simpld 495 |
. . . . 5
⊢ (𝑋 ∈ 𝐵 → 𝑁 ∈ Fin) |
10 | 9 | adantr 481 |
. . . 4
⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) → 𝑁 ∈ Fin) |
11 | 10 | 3ad2ant2 1133 |
. . 3
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝑁 ∈ Fin) |
12 | 9 | anim2i 617 |
. . . . . . . . . . . . . . 15
⊢ ((𝑅 ∈ CRing ∧ 𝑋 ∈ 𝐵) → (𝑅 ∈ CRing ∧ 𝑁 ∈ Fin)) |
13 | 12 | ancomd 462 |
. . . . . . . . . . . . . 14
⊢ ((𝑅 ∈ CRing ∧ 𝑋 ∈ 𝐵) → (𝑁 ∈ Fin ∧ 𝑅 ∈ CRing)) |
14 | 6, 2 | matbas2 21570 |
. . . . . . . . . . . . . 14
⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ CRing) →
((Base‘𝑅)
↑m (𝑁
× 𝑁)) =
(Base‘𝐴)) |
15 | 13, 14 | syl 17 |
. . . . . . . . . . . . 13
⊢ ((𝑅 ∈ CRing ∧ 𝑋 ∈ 𝐵) → ((Base‘𝑅) ↑m (𝑁 × 𝑁)) = (Base‘𝐴)) |
16 | 7, 15 | eqtr4id 2797 |
. . . . . . . . . . . 12
⊢ ((𝑅 ∈ CRing ∧ 𝑋 ∈ 𝐵) → 𝐵 = ((Base‘𝑅) ↑m (𝑁 × 𝑁))) |
17 | 16 | eleq2d 2824 |
. . . . . . . . . . 11
⊢ ((𝑅 ∈ CRing ∧ 𝑋 ∈ 𝐵) → (𝑋 ∈ 𝐵 ↔ 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))) |
18 | 17 | biimpd 228 |
. . . . . . . . . 10
⊢ ((𝑅 ∈ CRing ∧ 𝑋 ∈ 𝐵) → (𝑋 ∈ 𝐵 → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))) |
19 | 18 | ex 413 |
. . . . . . . . 9
⊢ (𝑅 ∈ CRing → (𝑋 ∈ 𝐵 → (𝑋 ∈ 𝐵 → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁))))) |
20 | 19 | adantr 481 |
. . . . . . . 8
⊢ ((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) → (𝑋 ∈ 𝐵 → (𝑋 ∈ 𝐵 → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁))))) |
21 | 20 | com12 32 |
. . . . . . 7
⊢ (𝑋 ∈ 𝐵 → ((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) → (𝑋 ∈ 𝐵 → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁))))) |
22 | 21 | pm2.43a 54 |
. . . . . 6
⊢ (𝑋 ∈ 𝐵 → ((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))) |
23 | 22 | adantr 481 |
. . . . 5
⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) → ((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁)))) |
24 | 23 | impcom 408 |
. . . 4
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉)) → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁))) |
25 | 24 | 3adant3 1131 |
. . 3
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝑋 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁))) |
26 | | crngring 19795 |
. . . . . . . 8
⊢ (𝑅 ∈ CRing → 𝑅 ∈ Ring) |
27 | 26 | adantr 481 |
. . . . . . 7
⊢ ((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) → 𝑅 ∈ Ring) |
28 | 27, 10 | anim12i 613 |
. . . . . 6
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉)) → (𝑅 ∈ Ring ∧ 𝑁 ∈ Fin)) |
29 | 28 | 3adant3 1131 |
. . . . 5
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → (𝑅 ∈ Ring ∧ 𝑁 ∈ Fin)) |
30 | | ne0i 4268 |
. . . . . . . . 9
⊢ (𝐼 ∈ 𝑁 → 𝑁 ≠ ∅) |
31 | 30 | adantl 482 |
. . . . . . . 8
⊢ ((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) → 𝑁 ≠ ∅) |
32 | 31 | 3ad2ant1 1132 |
. . . . . . 7
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝑁 ≠ ∅) |
33 | 11, 11, 32 | 3jca 1127 |
. . . . . 6
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → (𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅)) |
34 | | cramerimp.v |
. . . . . . . . . . 11
⊢ 𝑉 = ((Base‘𝑅) ↑m 𝑁) |
35 | 34 | eleq2i 2830 |
. . . . . . . . . 10
⊢ (𝑌 ∈ 𝑉 ↔ 𝑌 ∈ ((Base‘𝑅) ↑m 𝑁)) |
36 | 35 | biimpi 215 |
. . . . . . . . 9
⊢ (𝑌 ∈ 𝑉 → 𝑌 ∈ ((Base‘𝑅) ↑m 𝑁)) |
37 | 36 | adantl 482 |
. . . . . . . 8
⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) → 𝑌 ∈ ((Base‘𝑅) ↑m 𝑁)) |
38 | 4, 37 | anim12i 613 |
. . . . . . 7
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉)) → (𝑅 ∈ CRing ∧ 𝑌 ∈ ((Base‘𝑅) ↑m 𝑁))) |
39 | 38 | 3adant3 1131 |
. . . . . 6
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → (𝑅 ∈ CRing ∧ 𝑌 ∈ ((Base‘𝑅) ↑m 𝑁))) |
40 | | simp3 1137 |
. . . . . 6
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → (𝑋 · 𝑍) = 𝑌) |
41 | | eqid 2738 |
. . . . . . . 8
⊢
((Base‘𝑅)
↑m (𝑁
× 𝑁)) =
((Base‘𝑅)
↑m (𝑁
× 𝑁)) |
42 | | cramerimp.x |
. . . . . . . 8
⊢ · =
(𝑅 maVecMul 〈𝑁, 𝑁〉) |
43 | | eqid 2738 |
. . . . . . . 8
⊢
((Base‘𝑅)
↑m 𝑁) =
((Base‘𝑅)
↑m 𝑁) |
44 | 2, 41, 34, 42, 43 | mavmulsolcl 21700 |
. . . . . . 7
⊢ (((𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅) ∧ (𝑅 ∈ CRing ∧ 𝑌 ∈ ((Base‘𝑅) ↑m 𝑁))) → ((𝑋 · 𝑍) = 𝑌 → 𝑍 ∈ 𝑉)) |
45 | 44 | imp 407 |
. . . . . 6
⊢ ((((𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅) ∧ (𝑅 ∈ CRing ∧ 𝑌 ∈ ((Base‘𝑅) ↑m 𝑁))) ∧ (𝑋 · 𝑍) = 𝑌) → 𝑍 ∈ 𝑉) |
46 | 33, 39, 40, 45 | syl21anc 835 |
. . . . 5
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝑍 ∈ 𝑉) |
47 | | simpr 485 |
. . . . . 6
⊢ ((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) → 𝐼 ∈ 𝑁) |
48 | 47 | 3ad2ant1 1132 |
. . . . 5
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝐼 ∈ 𝑁) |
49 | | cramerimp.e |
. . . . . 6
⊢ 𝐸 = (((1r‘𝐴)(𝑁 matRepV 𝑅)𝑍)‘𝐼) |
50 | | eqid 2738 |
. . . . . . 7
⊢
(1r‘𝐴) = (1r‘𝐴) |
51 | 6, 7, 34, 50 | ma1repvcl 21719 |
. . . . . 6
⊢ (((𝑅 ∈ Ring ∧ 𝑁 ∈ Fin) ∧ (𝑍 ∈ 𝑉 ∧ 𝐼 ∈ 𝑁)) → (((1r‘𝐴)(𝑁 matRepV 𝑅)𝑍)‘𝐼) ∈ 𝐵) |
52 | 49, 51 | eqeltrid 2843 |
. . . . 5
⊢ (((𝑅 ∈ Ring ∧ 𝑁 ∈ Fin) ∧ (𝑍 ∈ 𝑉 ∧ 𝐼 ∈ 𝑁)) → 𝐸 ∈ 𝐵) |
53 | 29, 46, 48, 52 | syl12anc 834 |
. . . 4
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝐸 ∈ 𝐵) |
54 | 16 | eqcomd 2744 |
. . . . . 6
⊢ ((𝑅 ∈ CRing ∧ 𝑋 ∈ 𝐵) → ((Base‘𝑅) ↑m (𝑁 × 𝑁)) = 𝐵) |
55 | 54 | ad2ant2r 744 |
. . . . 5
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉)) → ((Base‘𝑅) ↑m (𝑁 × 𝑁)) = 𝐵) |
56 | 55 | 3adant3 1131 |
. . . 4
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → ((Base‘𝑅) ↑m (𝑁 × 𝑁)) = 𝐵) |
57 | 53, 56 | eleqtrrd 2842 |
. . 3
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝐸 ∈ ((Base‘𝑅) ↑m (𝑁 × 𝑁))) |
58 | 1, 2, 3, 5, 11, 11, 11, 25, 57 | mamuval 21535 |
. 2
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → (𝑋 × 𝐸) = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ (𝑅 Σg (𝑙 ∈ 𝑁 ↦ ((𝑖𝑋𝑙)(.r‘𝑅)(𝑙𝐸𝑗)))))) |
59 | 27 | 3ad2ant1 1132 |
. . . . 5
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝑅 ∈ Ring) |
60 | 59 | 3ad2ant1 1132 |
. . . 4
⊢ ((((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝑅 ∈ Ring) |
61 | | simpl 483 |
. . . . . . 7
⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) → 𝑋 ∈ 𝐵) |
62 | 61 | 3ad2ant2 1133 |
. . . . . 6
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝑋 ∈ 𝐵) |
63 | 62, 46, 48 | 3jca 1127 |
. . . . 5
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → (𝑋 ∈ 𝐵 ∧ 𝑍 ∈ 𝑉 ∧ 𝐼 ∈ 𝑁)) |
64 | 63 | 3ad2ant1 1132 |
. . . 4
⊢ ((((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → (𝑋 ∈ 𝐵 ∧ 𝑍 ∈ 𝑉 ∧ 𝐼 ∈ 𝑁)) |
65 | | simp2 1136 |
. . . 4
⊢ ((((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝑖 ∈ 𝑁) |
66 | | simp3 1137 |
. . . 4
⊢ ((((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝑗 ∈ 𝑁) |
67 | 40 | 3ad2ant1 1132 |
. . . 4
⊢ ((((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → (𝑋 · 𝑍) = 𝑌) |
68 | | eqid 2738 |
. . . . 5
⊢
(0g‘𝑅) = (0g‘𝑅) |
69 | 6, 7, 34, 50, 68, 49, 42 | mulmarep1gsum2 21723 |
. . . 4
⊢ ((𝑅 ∈ Ring ∧ (𝑋 ∈ 𝐵 ∧ 𝑍 ∈ 𝑉 ∧ 𝐼 ∈ 𝑁) ∧ (𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁 ∧ (𝑋 · 𝑍) = 𝑌)) → (𝑅 Σg (𝑙 ∈ 𝑁 ↦ ((𝑖𝑋𝑙)(.r‘𝑅)(𝑙𝐸𝑗)))) = if(𝑗 = 𝐼, (𝑌‘𝑖), (𝑖𝑋𝑗))) |
70 | 60, 64, 65, 66, 67, 69 | syl113anc 1381 |
. . 3
⊢ ((((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → (𝑅 Σg (𝑙 ∈ 𝑁 ↦ ((𝑖𝑋𝑙)(.r‘𝑅)(𝑙𝐸𝑗)))) = if(𝑗 = 𝐼, (𝑌‘𝑖), (𝑖𝑋𝑗))) |
71 | 70 | mpoeq3dva 7352 |
. 2
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ (𝑅 Σg (𝑙 ∈ 𝑁 ↦ ((𝑖𝑋𝑙)(.r‘𝑅)(𝑙𝐸𝑗))))) = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝐼, (𝑌‘𝑖), (𝑖𝑋𝑗)))) |
72 | | cramerimp.h |
. . 3
⊢ 𝐻 = ((𝑋(𝑁 matRepV 𝑅)𝑌)‘𝐼) |
73 | | simpr 485 |
. . . . 5
⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) → 𝑌 ∈ 𝑉) |
74 | 73 | 3ad2ant2 1133 |
. . . 4
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → 𝑌 ∈ 𝑉) |
75 | | eqid 2738 |
. . . . 5
⊢ (𝑁 matRepV 𝑅) = (𝑁 matRepV 𝑅) |
76 | 6, 7, 75, 34 | marepvval 21716 |
. . . 4
⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉 ∧ 𝐼 ∈ 𝑁) → ((𝑋(𝑁 matRepV 𝑅)𝑌)‘𝐼) = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝐼, (𝑌‘𝑖), (𝑖𝑋𝑗)))) |
77 | 62, 74, 48, 76 | syl3anc 1370 |
. . 3
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → ((𝑋(𝑁 matRepV 𝑅)𝑌)‘𝐼) = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝐼, (𝑌‘𝑖), (𝑖𝑋𝑗)))) |
78 | 72, 77 | eqtr2id 2791 |
. 2
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑗 = 𝐼, (𝑌‘𝑖), (𝑖𝑋𝑗))) = 𝐻) |
79 | 58, 71, 78 | 3eqtrd 2782 |
1
⊢ (((𝑅 ∈ CRing ∧ 𝐼 ∈ 𝑁) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) ∧ (𝑋 · 𝑍) = 𝑌) → (𝑋 × 𝐸) = 𝐻) |