Proof of Theorem uzwo3lem1
| Step | Hyp | Ref
| Expression |
| 1 | | btwnz 4613 |
. . 3
⊢ (B
∈ ℝ → (∃v ∈
ℤ v < B ∧ ∃z
∈ ℤ B < z)) |
| 2 | 1 | pm3.26d 258 |
. 2
⊢ (B
∈ ℝ → ∃v ∈
ℤ v < B) |
| 3 | | ltletrt 4290 |
. . . . . . . . . . . . . . . . . 18
⊢ ((v
∈ ℝ ∧ B ∈ ℝ ∧
z ∈ ℝ) → ((v < B ∧
B ≤ z) → v <
z)) |
| 4 | | ltlet 4286 |
. . . . . . . . . . . . . . . . . . 19
⊢ ((v
∈ ℝ ∧ z ∈ ℝ)
→ (v < z → v ≤
z)) |
| 5 | 4 | 3adant2 598 |
. . . . . . . . . . . . . . . . . 18
⊢ ((v
∈ ℝ ∧ B ∈ ℝ ∧
z ∈ ℝ) → (v < z →
v ≤ z)) |
| 6 | 3, 5 | syld 27 |
. . . . . . . . . . . . . . . . 17
⊢ ((v
∈ ℝ ∧ B ∈ ℝ ∧
z ∈ ℝ) → ((v < B ∧
B ≤ z) → v ≤
z)) |
| 7 | | zret 4567 |
. . . . . . . . . . . . . . . . 17
⊢ (z
∈ ℤ → z ∈
ℝ) |
| 8 | 6, 7 | syl3an3 621 |
. . . . . . . . . . . . . . . 16
⊢ ((v
∈ ℝ ∧ B ∈ ℝ ∧
z ∈ ℤ) → ((v < B ∧
B ≤ z) → v ≤
z)) |
| 9 | | zret 4567 |
. . . . . . . . . . . . . . . 16
⊢ (v
∈ ℤ → v ∈
ℝ) |
| 10 | 8, 9 | syl3an1 619 |
. . . . . . . . . . . . . . 15
⊢ ((v
∈ ℤ ∧ B ∈ ℝ ∧
z ∈ ℤ) → ((v < B ∧
B ≤ z) → v ≤
z)) |
| 11 | 10 | exp3a 292 |
. . . . . . . . . . . . . 14
⊢ ((v
∈ ℤ ∧ B ∈ ℝ ∧
z ∈ ℤ) → (v < B →
(B ≤ z → v ≤
z))) |
| 12 | 11 | 3exp 611 |
. . . . . . . . . . . . 13
⊢ (v
∈ ℤ → (B ∈ ℝ
→ (z ∈ ℤ → (v < B →
(B ≤ z → v ≤
z))))) |
| 13 | 12 | com34 36 |
. . . . . . . . . . . 12
⊢ (v
∈ ℤ → (B ∈ ℝ
→ (v < B → (z
∈ ℤ → (B ≤ z → v ≤
z))))) |
| 14 | 13 | imp32 281 |
. . . . . . . . . . 11
⊢ ((v
∈ ℤ ∧ (B ∈ ℝ
∧ v < B)) → (z
∈ ℤ → (B ≤ z → v ≤
z))) |
| 15 | 14 | r19.21aiv 1259 |
. . . . . . . . . 10
⊢ ((v
∈ ℤ ∧ (B ∈ ℝ
∧ v < B)) → ∀z ∈ ℤ (B ≤ z →
v ≤ z)) |
| 16 | | ss2rab 1553 |
. . . . . . . . . 10
⊢ ({z
∈ ℤ∣B ≤ z} ⊆ {z
∈ ℤ∣v ≤ z} ↔ ∀z ∈ ℤ (B ≤ z →
v ≤ z)) |
| 17 | 15, 16 | sylibr 175 |
. . . . . . . . 9
⊢ ((v
∈ ℤ ∧ (B ∈ ℝ
∧ v < B)) → {z
∈ ℤ∣B ≤ z} ⊆ {z
∈ ℤ∣v ≤ z}) |
| 18 | | uzwo3lem.1 |
. . . . . . . . 9
⊢ R =
{z ∈ ℤ∣B ≤ z} |
| 19 | 17, 18 | syl5ss 1544 |
. . . . . . . 8
⊢ ((v
∈ ℤ ∧ (B ∈ ℝ
∧ v < B)) → R
⊆ {z ∈ ℤ∣v ≤ z}) |
| 20 | 1 | pm3.27d 262 |
. . . . . . . . . 10
⊢ (B
∈ ℝ → ∃z ∈
ℤ B < z) |
| 21 | | ltlet 4286 |
. . . . . . . . . . . . 13
⊢ ((B
∈ ℝ ∧ z ∈ ℝ)
→ (B < z → B ≤
z)) |
| 22 | 21, 7 | sylan2 346 |
. . . . . . . . . . . 12
⊢ ((B
∈ ℝ ∧ z ∈ ℤ)
→ (B < z → B ≤
z)) |
| 23 | 22 | r19.22dva 1280 |
. . . . . . . . . . 11
⊢ (B
∈ ℝ → (∃z ∈
ℤ B < z → ∃z ∈ ℤ B ≤ z)) |
| 24 | 18 | cleq1i 1108 |
. . . . . . . . . . . . . 14
⊢ (R =
∅ ↔ {z ∈
ℤ∣B ≤ z} = ∅) |
| 25 | 24 | negbii 162 |
. . . . . . . . . . . . 13
⊢ (¬ R = ∅ ↔ ¬ {z ∈ ℤ∣B ≤ z} =
∅) |
| 26 | | rabn0 1716 |
. . . . . . . . . . . . 13
⊢ (¬ {z ∈ ℤ∣B ≤ z} =
∅ ↔ ∃z ∈ ℤ
B ≤ z) |
| 27 | 25, 26 | bitr2 152 |
. . . . . . . . . . . 12
⊢ (∃z ∈ ℤ B ≤ z ↔
¬ R = ∅) |
| 28 | | df-ne 1192 |
. . . . . . . . . . . 12
⊢ (R
≠ ∅ ↔ ¬ R =
∅) |
| 29 | 27, 28 | bitr4 154 |
. . . . . . . . . . 11
⊢ (∃z ∈ ℤ B ≤ z ↔
R ≠ ∅) |
| 30 | 23, 29 | syl6ib 185 |
. . . . . . . . . 10
⊢ (B
∈ ℝ → (∃z ∈
ℤ B < z → R ≠
∅)) |
| 31 | 20, 30 | mpd 46 |
. . . . . . . . 9
⊢ (B
∈ ℝ → R ≠
∅) |
| 32 | 31 | ad2antrl 322 |
. . . . . . . 8
⊢ ((v
∈ ℤ ∧ (B ∈ ℝ
∧ v < B)) → R
≠ ∅) |
| 33 | 19, 32 | jca 236 |
. . . . . . 7
⊢ ((v
∈ ℤ ∧ (B ∈ ℝ
∧ v < B)) → (R
⊆ {z ∈ ℤ∣v ≤ z} ∧
R ≠ ∅)) |
| 34 | 33 | exp 291 |
. . . . . 6
⊢ (v
∈ ℤ → ((B ∈ ℝ
∧ v < B) → (R
⊆ {z ∈ ℤ∣v ≤ z} ∧
R ≠ ∅))) |
| 35 | | uzwo2 4606 |
. . . . . . 7
⊢ ((v
∈ ℤ ∧ (R ⊆ {z ∈ ℤ∣v ≤ z} ∧
R ≠ ∅)) → ∃!x ∈ R
∀y ∈ R x ≤
y) |
| 36 | 35 | exp 291 |
. . . . . 6
⊢ (v
∈ ℤ → ((R ⊆ {z ∈ ℤ∣v ≤ z} ∧
R ≠ ∅) → ∃!x ∈ R
∀y ∈ R x ≤
y)) |
| 37 | 34, 36 | syld 27 |
. . . . 5
⊢ (v
∈ ℤ → ((B ∈ ℝ
∧ v < B) → ∃!x ∈ R
∀y ∈ R x ≤
y)) |
| 38 | 37 | exp3a 292 |
. . . 4
⊢ (v
∈ ℤ → (B ∈ ℝ
→ (v < B → ∃!x ∈ R
∀y ∈ R x ≤
y))) |
| 39 | 38 | com12 13 |
. . 3
⊢ (B
∈ ℝ → (v ∈ ℤ
→ (v < B → ∃!x ∈ R
∀y ∈ R x ≤
y))) |
| 40 | 39 | r19.23adv 1286 |
. 2
⊢ (B
∈ ℝ → (∃v ∈
ℤ v < B → ∃!x ∈ R
∀y ∈ R x ≤
y)) |
| 41 | 2, 40 | mpd 46 |
1
⊢ (B
∈ ℝ → ∃!x ∈
R ∀y ∈ R
x ≤ y) |