Step | Hyp | Ref
| Expression |
1 | | ssrab2 4009 |
. . 3
⊢ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ⊆ 𝐵 |
2 | 1 | a1i 11 |
. 2
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) → {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ⊆ 𝐵) |
3 | | fveq2 6756 |
. . . . 5
⊢ (𝑥 = (0g‘𝐺) → (𝑂‘𝑥) = (𝑂‘(0g‘𝐺))) |
4 | 3 | breq1d 5080 |
. . . 4
⊢ (𝑥 = (0g‘𝐺) → ((𝑂‘𝑥) ∥ 𝑁 ↔ (𝑂‘(0g‘𝐺)) ∥ 𝑁)) |
5 | | ablgrp 19306 |
. . . . . 6
⊢ (𝐺 ∈ Abel → 𝐺 ∈ Grp) |
6 | 5 | adantr 480 |
. . . . 5
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) → 𝐺 ∈ Grp) |
7 | | oddvdssubg.1 |
. . . . . 6
⊢ 𝐵 = (Base‘𝐺) |
8 | | eqid 2738 |
. . . . . 6
⊢
(0g‘𝐺) = (0g‘𝐺) |
9 | 7, 8 | grpidcl 18522 |
. . . . 5
⊢ (𝐺 ∈ Grp →
(0g‘𝐺)
∈ 𝐵) |
10 | 6, 9 | syl 17 |
. . . 4
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) →
(0g‘𝐺)
∈ 𝐵) |
11 | | torsubg.1 |
. . . . . . 7
⊢ 𝑂 = (od‘𝐺) |
12 | 11, 8 | od1 19081 |
. . . . . 6
⊢ (𝐺 ∈ Grp → (𝑂‘(0g‘𝐺)) = 1) |
13 | 6, 12 | syl 17 |
. . . . 5
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) → (𝑂‘(0g‘𝐺)) = 1) |
14 | | 1dvds 15908 |
. . . . . 6
⊢ (𝑁 ∈ ℤ → 1 ∥
𝑁) |
15 | 14 | adantl 481 |
. . . . 5
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) → 1
∥ 𝑁) |
16 | 13, 15 | eqbrtrd 5092 |
. . . 4
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) → (𝑂‘(0g‘𝐺)) ∥ 𝑁) |
17 | 4, 10, 16 | elrabd 3619 |
. . 3
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) →
(0g‘𝐺)
∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}) |
18 | 17 | ne0d 4266 |
. 2
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) → {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ≠ ∅) |
19 | | fveq2 6756 |
. . . . . 6
⊢ (𝑥 = 𝑦 → (𝑂‘𝑥) = (𝑂‘𝑦)) |
20 | 19 | breq1d 5080 |
. . . . 5
⊢ (𝑥 = 𝑦 → ((𝑂‘𝑥) ∥ 𝑁 ↔ (𝑂‘𝑦) ∥ 𝑁)) |
21 | 20 | elrab 3617 |
. . . 4
⊢ (𝑦 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ↔ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) |
22 | | fveq2 6756 |
. . . . . . . . 9
⊢ (𝑥 = 𝑧 → (𝑂‘𝑥) = (𝑂‘𝑧)) |
23 | 22 | breq1d 5080 |
. . . . . . . 8
⊢ (𝑥 = 𝑧 → ((𝑂‘𝑥) ∥ 𝑁 ↔ (𝑂‘𝑧) ∥ 𝑁)) |
24 | 23 | elrab 3617 |
. . . . . . 7
⊢ (𝑧 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ↔ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) |
25 | | fveq2 6756 |
. . . . . . . . 9
⊢ (𝑥 = (𝑦(+g‘𝐺)𝑧) → (𝑂‘𝑥) = (𝑂‘(𝑦(+g‘𝐺)𝑧))) |
26 | 25 | breq1d 5080 |
. . . . . . . 8
⊢ (𝑥 = (𝑦(+g‘𝐺)𝑧) → ((𝑂‘𝑥) ∥ 𝑁 ↔ (𝑂‘(𝑦(+g‘𝐺)𝑧)) ∥ 𝑁)) |
27 | 6 | adantr 480 |
. . . . . . . . . 10
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) → 𝐺 ∈ Grp) |
28 | 27 | adantr 480 |
. . . . . . . . 9
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → 𝐺 ∈ Grp) |
29 | | simprl 767 |
. . . . . . . . . 10
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) → 𝑦 ∈ 𝐵) |
30 | 29 | adantr 480 |
. . . . . . . . 9
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → 𝑦 ∈ 𝐵) |
31 | | simprl 767 |
. . . . . . . . 9
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → 𝑧 ∈ 𝐵) |
32 | | eqid 2738 |
. . . . . . . . . 10
⊢
(+g‘𝐺) = (+g‘𝐺) |
33 | 7, 32 | grpcl 18500 |
. . . . . . . . 9
⊢ ((𝐺 ∈ Grp ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑦(+g‘𝐺)𝑧) ∈ 𝐵) |
34 | 28, 30, 31, 33 | syl3anc 1369 |
. . . . . . . 8
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (𝑦(+g‘𝐺)𝑧) ∈ 𝐵) |
35 | | simplll 771 |
. . . . . . . . . . 11
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → 𝐺 ∈ Abel) |
36 | | simpllr 772 |
. . . . . . . . . . 11
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → 𝑁 ∈ ℤ) |
37 | | eqid 2738 |
. . . . . . . . . . . 12
⊢
(.g‘𝐺) = (.g‘𝐺) |
38 | 7, 37, 32 | mulgdi 19343 |
. . . . . . . . . . 11
⊢ ((𝐺 ∈ Abel ∧ (𝑁 ∈ ℤ ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑁(.g‘𝐺)(𝑦(+g‘𝐺)𝑧)) = ((𝑁(.g‘𝐺)𝑦)(+g‘𝐺)(𝑁(.g‘𝐺)𝑧))) |
39 | 35, 36, 30, 31, 38 | syl13anc 1370 |
. . . . . . . . . 10
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (𝑁(.g‘𝐺)(𝑦(+g‘𝐺)𝑧)) = ((𝑁(.g‘𝐺)𝑦)(+g‘𝐺)(𝑁(.g‘𝐺)𝑧))) |
40 | | simprr 769 |
. . . . . . . . . . . . 13
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) → (𝑂‘𝑦) ∥ 𝑁) |
41 | 40 | adantr 480 |
. . . . . . . . . . . 12
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (𝑂‘𝑦) ∥ 𝑁) |
42 | 7, 11, 37, 8 | oddvds 19070 |
. . . . . . . . . . . . 13
⊢ ((𝐺 ∈ Grp ∧ 𝑦 ∈ 𝐵 ∧ 𝑁 ∈ ℤ) → ((𝑂‘𝑦) ∥ 𝑁 ↔ (𝑁(.g‘𝐺)𝑦) = (0g‘𝐺))) |
43 | 28, 30, 36, 42 | syl3anc 1369 |
. . . . . . . . . . . 12
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → ((𝑂‘𝑦) ∥ 𝑁 ↔ (𝑁(.g‘𝐺)𝑦) = (0g‘𝐺))) |
44 | 41, 43 | mpbid 231 |
. . . . . . . . . . 11
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (𝑁(.g‘𝐺)𝑦) = (0g‘𝐺)) |
45 | | simprr 769 |
. . . . . . . . . . . 12
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (𝑂‘𝑧) ∥ 𝑁) |
46 | 7, 11, 37, 8 | oddvds 19070 |
. . . . . . . . . . . . 13
⊢ ((𝐺 ∈ Grp ∧ 𝑧 ∈ 𝐵 ∧ 𝑁 ∈ ℤ) → ((𝑂‘𝑧) ∥ 𝑁 ↔ (𝑁(.g‘𝐺)𝑧) = (0g‘𝐺))) |
47 | 28, 31, 36, 46 | syl3anc 1369 |
. . . . . . . . . . . 12
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → ((𝑂‘𝑧) ∥ 𝑁 ↔ (𝑁(.g‘𝐺)𝑧) = (0g‘𝐺))) |
48 | 45, 47 | mpbid 231 |
. . . . . . . . . . 11
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (𝑁(.g‘𝐺)𝑧) = (0g‘𝐺)) |
49 | 44, 48 | oveq12d 7273 |
. . . . . . . . . 10
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → ((𝑁(.g‘𝐺)𝑦)(+g‘𝐺)(𝑁(.g‘𝐺)𝑧)) = ((0g‘𝐺)(+g‘𝐺)(0g‘𝐺))) |
50 | 28, 9 | syl 17 |
. . . . . . . . . . 11
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (0g‘𝐺) ∈ 𝐵) |
51 | 7, 32, 8 | grplid 18524 |
. . . . . . . . . . 11
⊢ ((𝐺 ∈ Grp ∧
(0g‘𝐺)
∈ 𝐵) →
((0g‘𝐺)(+g‘𝐺)(0g‘𝐺)) = (0g‘𝐺)) |
52 | 28, 50, 51 | syl2anc 583 |
. . . . . . . . . 10
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → ((0g‘𝐺)(+g‘𝐺)(0g‘𝐺)) = (0g‘𝐺)) |
53 | 39, 49, 52 | 3eqtrd 2782 |
. . . . . . . . 9
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (𝑁(.g‘𝐺)(𝑦(+g‘𝐺)𝑧)) = (0g‘𝐺)) |
54 | 7, 11, 37, 8 | oddvds 19070 |
. . . . . . . . . 10
⊢ ((𝐺 ∈ Grp ∧ (𝑦(+g‘𝐺)𝑧) ∈ 𝐵 ∧ 𝑁 ∈ ℤ) → ((𝑂‘(𝑦(+g‘𝐺)𝑧)) ∥ 𝑁 ↔ (𝑁(.g‘𝐺)(𝑦(+g‘𝐺)𝑧)) = (0g‘𝐺))) |
55 | 28, 34, 36, 54 | syl3anc 1369 |
. . . . . . . . 9
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → ((𝑂‘(𝑦(+g‘𝐺)𝑧)) ∥ 𝑁 ↔ (𝑁(.g‘𝐺)(𝑦(+g‘𝐺)𝑧)) = (0g‘𝐺))) |
56 | 53, 55 | mpbird 256 |
. . . . . . . 8
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (𝑂‘(𝑦(+g‘𝐺)𝑧)) ∥ 𝑁) |
57 | 26, 34, 56 | elrabd 3619 |
. . . . . . 7
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ (𝑧 ∈ 𝐵 ∧ (𝑂‘𝑧) ∥ 𝑁)) → (𝑦(+g‘𝐺)𝑧) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}) |
58 | 24, 57 | sylan2b 593 |
. . . . . 6
⊢ ((((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) ∧ 𝑧 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}) → (𝑦(+g‘𝐺)𝑧) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}) |
59 | 58 | ralrimiva 3107 |
. . . . 5
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) → ∀𝑧 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} (𝑦(+g‘𝐺)𝑧) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}) |
60 | | fveq2 6756 |
. . . . . . 7
⊢ (𝑥 = ((invg‘𝐺)‘𝑦) → (𝑂‘𝑥) = (𝑂‘((invg‘𝐺)‘𝑦))) |
61 | 60 | breq1d 5080 |
. . . . . 6
⊢ (𝑥 = ((invg‘𝐺)‘𝑦) → ((𝑂‘𝑥) ∥ 𝑁 ↔ (𝑂‘((invg‘𝐺)‘𝑦)) ∥ 𝑁)) |
62 | | eqid 2738 |
. . . . . . . 8
⊢
(invg‘𝐺) = (invg‘𝐺) |
63 | 7, 62 | grpinvcl 18542 |
. . . . . . 7
⊢ ((𝐺 ∈ Grp ∧ 𝑦 ∈ 𝐵) → ((invg‘𝐺)‘𝑦) ∈ 𝐵) |
64 | 27, 29, 63 | syl2anc 583 |
. . . . . 6
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) → ((invg‘𝐺)‘𝑦) ∈ 𝐵) |
65 | 11, 62, 7 | odinv 19083 |
. . . . . . . 8
⊢ ((𝐺 ∈ Grp ∧ 𝑦 ∈ 𝐵) → (𝑂‘((invg‘𝐺)‘𝑦)) = (𝑂‘𝑦)) |
66 | 27, 29, 65 | syl2anc 583 |
. . . . . . 7
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) → (𝑂‘((invg‘𝐺)‘𝑦)) = (𝑂‘𝑦)) |
67 | 66, 40 | eqbrtrd 5092 |
. . . . . 6
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) → (𝑂‘((invg‘𝐺)‘𝑦)) ∥ 𝑁) |
68 | 61, 64, 67 | elrabd 3619 |
. . . . 5
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) → ((invg‘𝐺)‘𝑦) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}) |
69 | 59, 68 | jca 511 |
. . . 4
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ (𝑦 ∈ 𝐵 ∧ (𝑂‘𝑦) ∥ 𝑁)) → (∀𝑧 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} (𝑦(+g‘𝐺)𝑧) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∧ ((invg‘𝐺)‘𝑦) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁})) |
70 | 21, 69 | sylan2b 593 |
. . 3
⊢ (((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) ∧ 𝑦 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁}) → (∀𝑧 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} (𝑦(+g‘𝐺)𝑧) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∧ ((invg‘𝐺)‘𝑦) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁})) |
71 | 70 | ralrimiva 3107 |
. 2
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) →
∀𝑦 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} (∀𝑧 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} (𝑦(+g‘𝐺)𝑧) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∧ ((invg‘𝐺)‘𝑦) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁})) |
72 | 7, 32, 62 | issubg2 18685 |
. . 3
⊢ (𝐺 ∈ Grp → ({𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∈ (SubGrp‘𝐺) ↔ ({𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ⊆ 𝐵 ∧ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ≠ ∅ ∧ ∀𝑦 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} (∀𝑧 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} (𝑦(+g‘𝐺)𝑧) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∧ ((invg‘𝐺)‘𝑦) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁})))) |
73 | 6, 72 | syl 17 |
. 2
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) → ({𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∈ (SubGrp‘𝐺) ↔ ({𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ⊆ 𝐵 ∧ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ≠ ∅ ∧ ∀𝑦 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} (∀𝑧 ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} (𝑦(+g‘𝐺)𝑧) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∧ ((invg‘𝐺)‘𝑦) ∈ {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁})))) |
74 | 2, 18, 71, 73 | mpbir3and 1340 |
1
⊢ ((𝐺 ∈ Abel ∧ 𝑁 ∈ ℤ) → {𝑥 ∈ 𝐵 ∣ (𝑂‘𝑥) ∥ 𝑁} ∈ (SubGrp‘𝐺)) |