Step | Hyp | Ref
| Expression |
1 | | 1nn 11914 |
. . 3
⊢ 1 ∈
ℕ |
2 | | simpr 484 |
. . . 4
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 = ∅)
→ 𝐴 =
∅) |
3 | | 0ss 4327 |
. . . 4
⊢ ∅
⊆ (1...1) |
4 | 2, 3 | eqsstrdi 3971 |
. . 3
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 = ∅)
→ 𝐴 ⊆
(1...1)) |
5 | | oveq2 7263 |
. . . . 5
⊢ (𝑛 = 1 → (1...𝑛) = (1...1)) |
6 | 5 | sseq2d 3949 |
. . . 4
⊢ (𝑛 = 1 → (𝐴 ⊆ (1...𝑛) ↔ 𝐴 ⊆ (1...1))) |
7 | 6 | rspcev 3552 |
. . 3
⊢ ((1
∈ ℕ ∧ 𝐴
⊆ (1...1)) → ∃𝑛 ∈ ℕ 𝐴 ⊆ (1...𝑛)) |
8 | 1, 4, 7 | sylancr 586 |
. 2
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 = ∅)
→ ∃𝑛 ∈
ℕ 𝐴 ⊆
(1...𝑛)) |
9 | | elin 3899 |
. . . . . . 7
⊢ (𝐴 ∈ (𝒫 ℕ ∩
Fin) ↔ (𝐴 ∈
𝒫 ℕ ∧ 𝐴
∈ Fin)) |
10 | 9 | simplbi 497 |
. . . . . 6
⊢ (𝐴 ∈ (𝒫 ℕ ∩
Fin) → 𝐴 ∈
𝒫 ℕ) |
11 | 10 | adantr 480 |
. . . . 5
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ 𝐴 ∈ 𝒫
ℕ) |
12 | 11 | elpwid 4541 |
. . . 4
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ 𝐴 ⊆
ℕ) |
13 | | nnssre 11907 |
. . . . . . 7
⊢ ℕ
⊆ ℝ |
14 | | ltso 10986 |
. . . . . . 7
⊢ < Or
ℝ |
15 | | soss 5514 |
. . . . . . 7
⊢ (ℕ
⊆ ℝ → ( < Or ℝ → < Or
ℕ)) |
16 | 13, 14, 15 | mp2 9 |
. . . . . 6
⊢ < Or
ℕ |
17 | 16 | a1i 11 |
. . . . 5
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ < Or ℕ) |
18 | 9 | simprbi 496 |
. . . . . 6
⊢ (𝐴 ∈ (𝒫 ℕ ∩
Fin) → 𝐴 ∈
Fin) |
19 | 18 | adantr 480 |
. . . . 5
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ 𝐴 ∈
Fin) |
20 | | simpr 484 |
. . . . 5
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ 𝐴 ≠
∅) |
21 | | fisupcl 9158 |
. . . . 5
⊢ (( <
Or ℕ ∧ (𝐴 ∈
Fin ∧ 𝐴 ≠ ∅
∧ 𝐴 ⊆ ℕ))
→ sup(𝐴, ℕ, <
) ∈ 𝐴) |
22 | 17, 19, 20, 12, 21 | syl13anc 1370 |
. . . 4
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ sup(𝐴, ℕ, <
) ∈ 𝐴) |
23 | 12, 22 | sseldd 3918 |
. . 3
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ sup(𝐴, ℕ, <
) ∈ ℕ) |
24 | 12 | sselda 3917 |
. . . . . . 7
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℕ) |
25 | | nnuz 12550 |
. . . . . . 7
⊢ ℕ =
(ℤ≥‘1) |
26 | 24, 25 | eleqtrdi 2849 |
. . . . . 6
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → 𝑥 ∈
(ℤ≥‘1)) |
27 | 24 | nnzd 12354 |
. . . . . . 7
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℤ) |
28 | 12 | adantr 480 |
. . . . . . . . 9
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → 𝐴 ⊆ ℕ) |
29 | 22 | adantr 480 |
. . . . . . . . 9
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → sup(𝐴, ℕ, < ) ∈ 𝐴) |
30 | 28, 29 | sseldd 3918 |
. . . . . . . 8
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → sup(𝐴, ℕ, < ) ∈
ℕ) |
31 | 30 | nnzd 12354 |
. . . . . . 7
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → sup(𝐴, ℕ, < ) ∈
ℤ) |
32 | | fisup2g 9157 |
. . . . . . . . . . . 12
⊢ (( <
Or ℕ ∧ (𝐴 ∈
Fin ∧ 𝐴 ≠ ∅
∧ 𝐴 ⊆ ℕ))
→ ∃𝑥 ∈
𝐴 (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℕ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧))) |
33 | 17, 19, 20, 12, 32 | syl13anc 1370 |
. . . . . . . . . . 11
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ ∃𝑥 ∈
𝐴 (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℕ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧))) |
34 | | ssrexv 3984 |
. . . . . . . . . . 11
⊢ (𝐴 ⊆ ℕ →
(∃𝑥 ∈ 𝐴 (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℕ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧)) → ∃𝑥 ∈ ℕ (∀𝑦 ∈ 𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℕ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧)))) |
35 | 12, 33, 34 | sylc 65 |
. . . . . . . . . 10
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ ∃𝑥 ∈
ℕ (∀𝑦 ∈
𝐴 ¬ 𝑥 < 𝑦 ∧ ∀𝑦 ∈ ℕ (𝑦 < 𝑥 → ∃𝑧 ∈ 𝐴 𝑦 < 𝑧))) |
36 | 17, 35 | supub 9148 |
. . . . . . . . 9
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ (𝑥 ∈ 𝐴 → ¬ sup(𝐴, ℕ, < ) < 𝑥)) |
37 | 36 | imp 406 |
. . . . . . . 8
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → ¬ sup(𝐴, ℕ, < ) < 𝑥) |
38 | 24 | nnred 11918 |
. . . . . . . . 9
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℝ) |
39 | 30 | nnred 11918 |
. . . . . . . . 9
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → sup(𝐴, ℕ, < ) ∈
ℝ) |
40 | 38, 39 | lenltd 11051 |
. . . . . . . 8
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → (𝑥 ≤ sup(𝐴, ℕ, < ) ↔ ¬ sup(𝐴, ℕ, < ) < 𝑥)) |
41 | 37, 40 | mpbird 256 |
. . . . . . 7
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → 𝑥 ≤ sup(𝐴, ℕ, < )) |
42 | | eluz2 12517 |
. . . . . . 7
⊢
(sup(𝐴, ℕ,
< ) ∈ (ℤ≥‘𝑥) ↔ (𝑥 ∈ ℤ ∧ sup(𝐴, ℕ, < ) ∈ ℤ ∧ 𝑥 ≤ sup(𝐴, ℕ, < ))) |
43 | 27, 31, 41, 42 | syl3anbrc 1341 |
. . . . . 6
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → sup(𝐴, ℕ, < ) ∈
(ℤ≥‘𝑥)) |
44 | | eluzfz 13180 |
. . . . . 6
⊢ ((𝑥 ∈
(ℤ≥‘1) ∧ sup(𝐴, ℕ, < ) ∈
(ℤ≥‘𝑥)) → 𝑥 ∈ (1...sup(𝐴, ℕ, < ))) |
45 | 26, 43, 44 | syl2anc 583 |
. . . . 5
⊢ (((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ (1...sup(𝐴, ℕ, < ))) |
46 | 45 | ex 412 |
. . . 4
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ (𝑥 ∈ 𝐴 → 𝑥 ∈ (1...sup(𝐴, ℕ, < )))) |
47 | 46 | ssrdv 3923 |
. . 3
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ 𝐴 ⊆
(1...sup(𝐴, ℕ, <
))) |
48 | | oveq2 7263 |
. . . . 5
⊢ (𝑛 = sup(𝐴, ℕ, < ) → (1...𝑛) = (1...sup(𝐴, ℕ, < ))) |
49 | 48 | sseq2d 3949 |
. . . 4
⊢ (𝑛 = sup(𝐴, ℕ, < ) → (𝐴 ⊆ (1...𝑛) ↔ 𝐴 ⊆ (1...sup(𝐴, ℕ, < )))) |
50 | 49 | rspcev 3552 |
. . 3
⊢
((sup(𝐴, ℕ,
< ) ∈ ℕ ∧ 𝐴 ⊆ (1...sup(𝐴, ℕ, < ))) → ∃𝑛 ∈ ℕ 𝐴 ⊆ (1...𝑛)) |
51 | 23, 47, 50 | syl2anc 583 |
. 2
⊢ ((𝐴 ∈ (𝒫 ℕ ∩
Fin) ∧ 𝐴 ≠ ∅)
→ ∃𝑛 ∈
ℕ 𝐴 ⊆
(1...𝑛)) |
52 | 8, 51 | pm2.61dane 3031 |
1
⊢ (𝐴 ∈ (𝒫 ℕ ∩
Fin) → ∃𝑛 ∈
ℕ 𝐴 ⊆
(1...𝑛)) |