| Step |
Hyp |
Ref |
Expression |
| 1 |
|
isdrng3.b |
⊢ 𝐵 = ( Base ‘ 𝑅 ) |
| 2 |
|
isdrng3.0 |
⊢ 0 = ( 0g ‘ 𝑅 ) |
| 3 |
|
isdrng3.1 |
⊢ 1 = ( 1r ‘ 𝑅 ) |
| 4 |
|
isdrng3.t |
⊢ · = ( .r ‘ 𝑅 ) |
| 5 |
1
|
isdrng3lem0 |
⊢ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = ( 𝐵 ∖ { 0 } ) |
| 6 |
5
|
eqcomi |
⊢ ( 𝐵 ∖ { 0 } ) = ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) |
| 7 |
6
|
eleq2i |
⊢ ( 𝑥 ∈ ( 𝐵 ∖ { 0 } ) ↔ 𝑥 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) |
| 8 |
|
oveq1 |
⊢ ( 𝑦 = ( ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ‘ 𝑥 ) → ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = ( ( ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ‘ 𝑥 ) ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) ) |
| 9 |
8
|
eqeq1d |
⊢ ( 𝑦 = ( ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ‘ 𝑥 ) → ( ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ↔ ( ( ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ‘ 𝑥 ) ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ) ) |
| 10 |
|
eqid |
⊢ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) |
| 11 |
|
eqid |
⊢ ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) |
| 12 |
10 11
|
grpinvcl |
⊢ ( ( ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ∧ 𝑥 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) → ( ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ‘ 𝑥 ) ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) |
| 13 |
12
|
adantll |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) → ( ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ‘ 𝑥 ) ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) |
| 14 |
|
eqid |
⊢ ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) |
| 15 |
|
eqid |
⊢ ( 0g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = ( 0g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) |
| 16 |
10 14 15 11
|
grplinv |
⊢ ( ( ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ∧ 𝑥 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) → ( ( ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ‘ 𝑥 ) ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = ( 0g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) |
| 17 |
16
|
adantll |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) → ( ( ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ‘ 𝑥 ) ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = ( 0g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) |
| 18 |
|
eqid |
⊢ ( mulGrp ‘ 𝑅 ) = ( mulGrp ‘ 𝑅 ) |
| 19 |
18
|
ringmgp |
⊢ ( 𝑅 ∈ Ring → ( mulGrp ‘ 𝑅 ) ∈ Mnd ) |
| 20 |
19
|
adantr |
⊢ ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) → ( mulGrp ‘ 𝑅 ) ∈ Mnd ) |
| 21 |
1 3
|
ringidcl |
⊢ ( 𝑅 ∈ Ring → 1 ∈ 𝐵 ) |
| 22 |
21
|
adantr |
⊢ ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) → 1 ∈ 𝐵 ) |
| 23 |
|
eqid |
⊢ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) = ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) |
| 24 |
1 2 23
|
isdrng2 |
⊢ ( 𝑅 ∈ DivRing ↔ ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ) |
| 25 |
2 3
|
drngunz |
⊢ ( 𝑅 ∈ DivRing → 1 ≠ 0 ) |
| 26 |
24 25
|
sylbir |
⊢ ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) → 1 ≠ 0 ) |
| 27 |
22 26
|
eldifsnd |
⊢ ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) → 1 ∈ ( 𝐵 ∖ { 0 } ) ) |
| 28 |
|
difssd |
⊢ ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) → ( 𝐵 ∖ { 0 } ) ⊆ 𝐵 ) |
| 29 |
18 1
|
mgpbas |
⊢ 𝐵 = ( Base ‘ ( mulGrp ‘ 𝑅 ) ) |
| 30 |
18 3
|
ringidval |
⊢ 1 = ( 0g ‘ ( mulGrp ‘ 𝑅 ) ) |
| 31 |
23 29 30
|
ress0g |
⊢ ( ( ( mulGrp ‘ 𝑅 ) ∈ Mnd ∧ 1 ∈ ( 𝐵 ∖ { 0 } ) ∧ ( 𝐵 ∖ { 0 } ) ⊆ 𝐵 ) → 1 = ( 0g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) |
| 32 |
31
|
eqcomd |
⊢ ( ( ( mulGrp ‘ 𝑅 ) ∈ Mnd ∧ 1 ∈ ( 𝐵 ∖ { 0 } ) ∧ ( 𝐵 ∖ { 0 } ) ⊆ 𝐵 ) → ( 0g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = 1 ) |
| 33 |
20 27 28 32
|
syl3anc |
⊢ ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) → ( 0g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = 1 ) |
| 34 |
33
|
adantr |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) → ( 0g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = 1 ) |
| 35 |
17 34
|
eqtrd |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) → ( ( ( invg ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ‘ 𝑥 ) ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ) |
| 36 |
9 13 35
|
rspcedvdw |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) → ∃ 𝑦 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ) |
| 37 |
7 36
|
sylan2b |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( 𝐵 ∖ { 0 } ) ) → ∃ 𝑦 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ) |
| 38 |
5
|
a1i |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( 𝐵 ∖ { 0 } ) ) → ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = ( 𝐵 ∖ { 0 } ) ) |
| 39 |
38
|
rexeqdv |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( 𝐵 ∖ { 0 } ) ) → ( ∃ 𝑦 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ↔ ∃ 𝑦 ∈ ( 𝐵 ∖ { 0 } ) ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ) ) |
| 40 |
18 4
|
mgpplusg |
⊢ · = ( +g ‘ ( mulGrp ‘ 𝑅 ) ) |
| 41 |
1
|
fvexi |
⊢ 𝐵 ∈ V |
| 42 |
41
|
difexi |
⊢ ( 𝐵 ∖ { 0 } ) ∈ V |
| 43 |
|
eqid |
⊢ ( +g ‘ ( mulGrp ‘ 𝑅 ) ) = ( +g ‘ ( mulGrp ‘ 𝑅 ) ) |
| 44 |
23 43
|
ressplusg |
⊢ ( ( 𝐵 ∖ { 0 } ) ∈ V → ( +g ‘ ( mulGrp ‘ 𝑅 ) ) = ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ) |
| 45 |
42 44
|
ax-mp |
⊢ ( +g ‘ ( mulGrp ‘ 𝑅 ) ) = ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) |
| 46 |
40 45
|
eqtr2i |
⊢ ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) = · |
| 47 |
46
|
oveqi |
⊢ ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = ( 𝑦 · 𝑥 ) |
| 48 |
47
|
eqeq1i |
⊢ ( ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ↔ ( 𝑦 · 𝑥 ) = 1 ) |
| 49 |
48
|
rexbii |
⊢ ( ∃ 𝑦 ∈ ( 𝐵 ∖ { 0 } ) ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ↔ ∃ 𝑦 ∈ ( 𝐵 ∖ { 0 } ) ( 𝑦 · 𝑥 ) = 1 ) |
| 50 |
39 49
|
bitrdi |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( 𝐵 ∖ { 0 } ) ) → ( ∃ 𝑦 ∈ ( Base ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) ( 𝑦 ( +g ‘ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ) 𝑥 ) = 1 ↔ ∃ 𝑦 ∈ ( 𝐵 ∖ { 0 } ) ( 𝑦 · 𝑥 ) = 1 ) ) |
| 51 |
37 50
|
mpbid |
⊢ ( ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) ∧ 𝑥 ∈ ( 𝐵 ∖ { 0 } ) ) → ∃ 𝑦 ∈ ( 𝐵 ∖ { 0 } ) ( 𝑦 · 𝑥 ) = 1 ) |
| 52 |
51
|
ralrimiva |
⊢ ( ( 𝑅 ∈ Ring ∧ ( ( mulGrp ‘ 𝑅 ) ↾s ( 𝐵 ∖ { 0 } ) ) ∈ Grp ) → ∀ 𝑥 ∈ ( 𝐵 ∖ { 0 } ) ∃ 𝑦 ∈ ( 𝐵 ∖ { 0 } ) ( 𝑦 · 𝑥 ) = 1 ) |