Proof of Theorem elnnz1
| Step | Hyp | Ref
| Expression |
| 1 | | nnzt 4579 |
. . 3
⊢ (A
∈ ℕ → A ∈
ℤ) |
| 2 | | nnge1t 4439 |
. . 3
⊢ (A
∈ ℕ → 1 ≤ A) |
| 3 | 1, 2 | jca 236 |
. 2
⊢ (A
∈ ℕ → (A ∈ ℤ
∧ 1 ≤ A)) |
| 4 | | lt01 4377 |
. . . . . . . . . 10
⊢ 0 < 1 |
| 5 | | ax1re 4064 |
. . . . . . . . . . 11
⊢ 1 ∈ ℝ |
| 6 | | lt0neg2t 4371 |
. . . . . . . . . . 11
⊢ (1 ∈ ℝ → (0 < 1 ↔
-1 < 0)) |
| 7 | 5, 6 | ax-mp 6 |
. . . . . . . . . 10
⊢ (0 < 1 ↔ -1 < 0) |
| 8 | 4, 7 | mpbi 164 |
. . . . . . . . 9
⊢ -1 < 0 |
| 9 | | lenegt 4368 |
. . . . . . . . . . . 12
⊢ ((1 ∈ ℝ ∧ A ∈ ℝ) → (1 ≤ A ↔ -A ≤
-1)) |
| 10 | 5, 9 | mpan 518 |
. . . . . . . . . . 11
⊢ (A
∈ ℝ → (1 ≤ A ↔
-A ≤ -1)) |
| 11 | | renegclt 4172 |
. . . . . . . . . . . . 13
⊢ (A
∈ ℝ → -A ∈
ℝ) |
| 12 | 5 | renegcl 4171 |
. . . . . . . . . . . . . . 15
⊢ -1 ∈ ℝ |
| 13 | | ax0re 4063 |
. . . . . . . . . . . . . . . 16
⊢ 0 ∈ ℝ |
| 14 | | lelttrt 4289 |
. . . . . . . . . . . . . . . 16
⊢ ((-A
∈ ℝ ∧ -1 ∈ ℝ ∧ 0 ∈ ℝ) →
((-A ≤ -1 ∧ -1 < 0) →
-A < 0)) |
| 15 | 13, 14 | mp3an3 641 |
. . . . . . . . . . . . . . 15
⊢ ((-A
∈ ℝ ∧ -1 ∈ ℝ) → ((-A ≤ -1 ∧ -1 < 0) → -A < 0)) |
| 16 | 12, 15 | mpan2 519 |
. . . . . . . . . . . . . 14
⊢ (-A
∈ ℝ → ((-A ≤ -1 ∧ -1
< 0) → -A < 0)) |
| 17 | | ltlet 4286 |
. . . . . . . . . . . . . . 15
⊢ ((-A
∈ ℝ ∧ 0 ∈ ℝ) → (-A < 0 → -A ≤ 0)) |
| 18 | 13, 17 | mpan2 519 |
. . . . . . . . . . . . . 14
⊢ (-A
∈ ℝ → (-A < 0 →
-A ≤ 0)) |
| 19 | 16, 18 | syld 27 |
. . . . . . . . . . . . 13
⊢ (-A
∈ ℝ → ((-A ≤ -1 ∧ -1
< 0) → -A ≤ 0)) |
| 20 | 11, 19 | syl 12 |
. . . . . . . . . . . 12
⊢ (A
∈ ℝ → ((-A ≤ -1 ∧ -1
< 0) → -A ≤ 0)) |
| 21 | 20 | exp3a 292 |
. . . . . . . . . . 11
⊢ (A
∈ ℝ → (-A ≤ -1 →
(-1 < 0 → -A ≤ 0))) |
| 22 | 10, 21 | sylbid 178 |
. . . . . . . . . 10
⊢ (A
∈ ℝ → (1 ≤ A → (-1
< 0 → -A ≤ 0))) |
| 23 | 22 | imp 277 |
. . . . . . . . 9
⊢ ((A
∈ ℝ ∧ 1 ≤ A) → (-1
< 0 → -A ≤ 0)) |
| 24 | 8, 23 | mpi 44 |
. . . . . . . 8
⊢ ((A
∈ ℝ ∧ 1 ≤ A) →
-A ≤ 0) |
| 25 | | leltt 4278 |
. . . . . . . . . . 11
⊢ ((-A
∈ ℝ ∧ 0 ∈ ℝ) → (-A ≤ 0 ↔ ¬ 0 < -A)) |
| 26 | 13, 25 | mpan2 519 |
. . . . . . . . . 10
⊢ (-A
∈ ℝ → (-A ≤ 0 ↔
¬ 0 < -A)) |
| 27 | 11, 26 | syl 12 |
. . . . . . . . 9
⊢ (A
∈ ℝ → (-A ≤ 0 ↔
¬ 0 < -A)) |
| 28 | 27 | adantr 306 |
. . . . . . . 8
⊢ ((A
∈ ℝ ∧ 1 ≤ A) →
(-A ≤ 0 ↔ ¬ 0 < -A)) |
| 29 | 24, 28 | mpbid 170 |
. . . . . . 7
⊢ ((A
∈ ℝ ∧ 1 ≤ A) → ¬
0 < -A) |
| 30 | | zret 4567 |
. . . . . . 7
⊢ (A
∈ ℤ → A ∈
ℝ) |
| 31 | 29, 30 | sylan 343 |
. . . . . 6
⊢ ((A
∈ ℤ ∧ 1 ≤ A) → ¬
0 < -A) |
| 32 | | nngt0t 4441 |
. . . . . 6
⊢ (-A
∈ ℕ → 0 < -A) |
| 33 | 31, 32 | nsyl 102 |
. . . . 5
⊢ ((A
∈ ℤ ∧ 1 ≤ A) → ¬
-A ∈ ℕ) |
| 34 | | breq2 2066 |
. . . . . . . . . 10
⊢ (A = 0
→ (1 ≤ A ↔ 1 ≤
0)) |
| 35 | 5, 13 | lelt 4301 |
. . . . . . . . . 10
⊢ (1 ≤ 0 ↔ ¬ 0 < 1) |
| 36 | 34, 35 | syl6bb 414 |
. . . . . . . . 9
⊢ (A = 0
→ (1 ≤ A ↔ ¬ 0 <
1)) |
| 37 | 36 | bicon2d 404 |
. . . . . . . 8
⊢ (A = 0
→ (0 < 1 ↔ ¬ 1 ≤ A)) |
| 38 | 4, 37 | mpbii 168 |
. . . . . . 7
⊢ (A = 0
→ ¬ 1 ≤ A) |
| 39 | 38 | con2i 89 |
. . . . . 6
⊢ (1 ≤ A → ¬ A
= 0) |
| 40 | 39 | adantl 305 |
. . . . 5
⊢ ((A
∈ ℤ ∧ 1 ≤ A) → ¬
A = 0) |
| 41 | 33, 40 | jca 236 |
. . . 4
⊢ ((A
∈ ℤ ∧ 1 ≤ A) →
(¬ -A ∈ ℕ ∧ ¬
A = 0)) |
| 42 | | ioran 254 |
. . . 4
⊢ (¬ (-A ∈ ℕ ∨ A = 0) ↔ (¬ -A ∈ ℕ ∧ ¬ A = 0)) |
| 43 | 41, 42 | sylibr 175 |
. . 3
⊢ ((A
∈ ℤ ∧ 1 ≤ A) → ¬
(-A ∈ ℕ ∨ A = 0)) |
| 44 | | elz 4565 |
. . . . . 6
⊢ (A
∈ ℤ ↔ (A ∈ ℝ
∧ (A = 0 ∨ A ∈ ℕ ∨ -A ∈ ℕ))) |
| 45 | | pm3.27 260 |
. . . . . . 7
⊢ ((A
∈ ℝ ∧ (A = 0 ∨ A ∈ ℕ ∨ -A ∈ ℕ)) → (A = 0 ∨ A
∈ ℕ ∨ -A ∈
ℕ)) |
| 46 | | 3orrot 587 |
. . . . . . . 8
⊢ ((-A
∈ ℕ ∨ A = 0 ∨ A ∈ ℕ) ↔ (A = 0 ∨ A
∈ ℕ ∨ -A ∈
ℕ)) |
| 47 | | df-3or 582 |
. . . . . . . 8
⊢ ((-A
∈ ℕ ∨ A = 0 ∨ A ∈ ℕ) ↔ ((-A ∈ ℕ ∨ A = 0) ∨ A
∈ ℕ)) |
| 48 | 46, 47 | bitr3 153 |
. . . . . . 7
⊢ ((A =
0 ∨ A ∈ ℕ ∨ -A ∈ ℕ) ↔ ((-A ∈ ℕ ∨ A = 0) ∨ A
∈ ℕ)) |
| 49 | 45, 48 | sylib 173 |
. . . . . 6
⊢ ((A
∈ ℝ ∧ (A = 0 ∨ A ∈ ℕ ∨ -A ∈ ℕ)) → ((-A ∈ ℕ ∨ A = 0) ∨ A
∈ ℕ)) |
| 50 | 44, 49 | sylbi 174 |
. . . . 5
⊢ (A
∈ ℤ → ((-A ∈ ℕ
∨ A = 0) ∨ A ∈ ℕ)) |
| 51 | 50 | ord 202 |
. . . 4
⊢ (A
∈ ℤ → (¬ (-A ∈
ℕ ∨ A = 0) → A ∈ ℕ)) |
| 52 | 51 | adantr 306 |
. . 3
⊢ ((A
∈ ℤ ∧ 1 ≤ A) →
(¬ (-A ∈ ℕ ∨ A = 0) → A
∈ ℕ)) |
| 53 | 43, 52 | mpd 46 |
. 2
⊢ ((A
∈ ℤ ∧ 1 ≤ A) →
A ∈ ℕ) |
| 54 | 3, 53 | impbi 139 |
1
⊢ (A
∈ ℕ ↔ (A ∈ ℤ
∧ 1 ≤ A)) |