Proof of Theorem uzwo2
| Step | Hyp | Ref
| Expression |
| 1 | | uzwo 4605 |
. . 3
⊢ ((B
∈ ℤ ∧ (A ⊆ {z ∈ ℤ∣B ≤ z} ∧
A ≠ ∅)) → ∃x ∈ A
∀y ∈ A x ≤
y) |
| 2 | | ssrab 1556 |
. . . . . . 7
⊢ {z
∈ ℤ∣B ≤ z} ⊆ ℤ |
| 3 | | zssre 4569 |
. . . . . . 7
⊢ ℤ ⊆ ℝ |
| 4 | 2, 3 | sstri 1512 |
. . . . . 6
⊢ {z
∈ ℤ∣B ≤ z} ⊆ ℝ |
| 5 | | sstr 1511 |
. . . . . 6
⊢ ((A
⊆ {z ∈ ℤ∣B ≤ z} ∧
{z ∈ ℤ∣B ≤ z}
⊆ ℝ) → A ⊆
ℝ) |
| 6 | 4, 5 | mpan2 519 |
. . . . 5
⊢ (A
⊆ {z ∈ ℤ∣B ≤ z} →
A ⊆ ℝ) |
| 7 | | breq2 2066 |
. . . . . . . . . . . . . 14
⊢ (y =
w → (x ≤ y ↔
x ≤ w)) |
| 8 | 7 | rcla4v 1402 |
. . . . . . . . . . . . 13
⊢ (∀y ∈ A
x ≤ y → (w
∈ A → x ≤ w)) |
| 9 | | breq2 2066 |
. . . . . . . . . . . . . 14
⊢ (y =
x → (w ≤ y ↔
w ≤ x)) |
| 10 | 9 | rcla4v 1402 |
. . . . . . . . . . . . 13
⊢ (∀y ∈ A
w ≤ y → (x
∈ A → w ≤ x)) |
| 11 | 8, 10 | im2anan9 434 |
. . . . . . . . . . . 12
⊢ ((∀y ∈ A
x ≤ y ∧ ∀y ∈ A
w ≤ y) → ((w
∈ A ∧ x ∈ A)
→ (x ≤ w ∧ w ≤
x))) |
| 12 | 11 | imp 277 |
. . . . . . . . . . 11
⊢ (((∀y ∈ A
x ≤ y ∧ ∀y ∈ A
w ≤ y) ∧ (w
∈ A ∧ x ∈ A))
→ (x ≤ w ∧ w ≤
x)) |
| 13 | | ancom 333 |
. . . . . . . . . . 11
⊢ ((x
∈ A ∧ w ∈ A)
↔ (w ∈ A ∧ x ∈
A)) |
| 14 | 12, 13 | sylan2b 347 |
. . . . . . . . . 10
⊢ (((∀y ∈ A
x ≤ y ∧ ∀y ∈ A
w ≤ y) ∧ (x
∈ A ∧ w ∈ A))
→ (x ≤ w ∧ w ≤
x)) |
| 15 | 14 | adantll 309 |
. . . . . . . . 9
⊢ (((A
⊆ ℝ ∧ (∀y ∈
A x
≤ y ∧ ∀y ∈ A
w ≤ y)) ∧ (x
∈ A ∧ w ∈ A))
→ (x ≤ w ∧ w ≤
x)) |
| 16 | | ssel 1502 |
. . . . . . . . . . . . 13
⊢ (A
⊆ ℝ → (x ∈ A → x
∈ ℝ)) |
| 17 | | ssel 1502 |
. . . . . . . . . . . . 13
⊢ (A
⊆ ℝ → (w ∈ A → w
∈ ℝ)) |
| 18 | 16, 17 | anim12d 431 |
. . . . . . . . . . . 12
⊢ (A
⊆ ℝ → ((x ∈ A ∧ w ∈
A) → (x ∈ ℝ ∧ w ∈ ℝ))) |
| 19 | 18 | imp 277 |
. . . . . . . . . . 11
⊢ ((A
⊆ ℝ ∧ (x ∈ A ∧ w ∈
A)) → (x ∈ ℝ ∧ w ∈ ℝ)) |
| 20 | | letri3t 4283 |
. . . . . . . . . . 11
⊢ ((x
∈ ℝ ∧ w ∈ ℝ)
→ (x = w ↔ (x ≤
w ∧ w ≤ x))) |
| 21 | 19, 20 | syl 12 |
. . . . . . . . . 10
⊢ ((A
⊆ ℝ ∧ (x ∈ A ∧ w ∈
A)) → (x = w ↔
(x ≤ w ∧ w ≤
x))) |
| 22 | 21 | adantlr 310 |
. . . . . . . . 9
⊢ (((A
⊆ ℝ ∧ (∀y ∈
A x
≤ y ∧ ∀y ∈ A
w ≤ y)) ∧ (x
∈ A ∧ w ∈ A))
→ (x = w ↔ (x ≤
w ∧ w ≤ x))) |
| 23 | 15, 22 | mpbird 171 |
. . . . . . . 8
⊢ (((A
⊆ ℝ ∧ (∀y ∈
A x
≤ y ∧ ∀y ∈ A
w ≤ y)) ∧ (x
∈ A ∧ w ∈ A))
→ x = w) |
| 24 | 23 | exp31 293 |
. . . . . . 7
⊢ (A
⊆ ℝ → ((∀y ∈
A x
≤ y ∧ ∀y ∈ A
w ≤ y) → ((x
∈ A ∧ w ∈ A)
→ x = w))) |
| 25 | 24 | com23 32 |
. . . . . 6
⊢ (A
⊆ ℝ → ((x ∈ A ∧ w ∈
A) → ((∀y ∈ A
x ≤ y ∧ ∀y ∈ A
w ≤ y) → x =
w))) |
| 26 | 25 | r19.21aivv 1263 |
. . . . 5
⊢ (A
⊆ ℝ → ∀x ∈
A ∀w ∈ A
((∀y ∈ A x ≤
y ∧ ∀y ∈ A
w ≤ y) → x =
w)) |
| 27 | 6, 26 | syl 12 |
. . . 4
⊢ (A
⊆ {z ∈ ℤ∣B ≤ z} →
∀x ∈ A ∀w
∈ A ((∀y ∈ A
x ≤ y ∧ ∀y ∈ A
w ≤ y) → x =
w)) |
| 28 | 27 | ad2antrl 322 |
. . 3
⊢ ((B
∈ ℤ ∧ (A ⊆ {z ∈ ℤ∣B ≤ z} ∧
A ≠ ∅)) → ∀x ∈ A
∀w ∈ A ((∀y
∈ A x ≤ y ∧
∀y ∈ A w ≤
y) → x = w)) |
| 29 | 1, 28 | jca 236 |
. 2
⊢ ((B
∈ ℤ ∧ (A ⊆ {z ∈ ℤ∣B ≤ z} ∧
A ≠ ∅)) → (∃x ∈ A
∀y ∈ A x ≤
y ∧ ∀x ∈ A
∀w ∈ A ((∀y
∈ A x ≤ y ∧
∀y ∈ A w ≤
y) → x = w))) |
| 30 | | breq1 2065 |
. . . 4
⊢ (x =
w → (x ≤ y ↔
w ≤ y)) |
| 31 | 30 | biraldv 1219 |
. . 3
⊢ (x =
w → (∀y ∈ A
x ≤ y ↔ ∀y ∈ A
w ≤ y)) |
| 32 | 31 | reu4 1340 |
. 2
⊢ (∃!x ∈ A
∀y ∈ A x ≤
y ↔ (∃x ∈ A
∀y ∈ A x ≤
y ∧ ∀x ∈ A
∀w ∈ A ((∀y
∈ A x ≤ y ∧
∀y ∈ A w ≤
y) → x = w))) |
| 33 | 29, 32 | sylibr 175 |
1
⊢ ((B
∈ ℤ ∧ (A ⊆ {z ∈ ℤ∣B ≤ z} ∧
A ≠ ∅)) → ∃!x ∈ A
∀y ∈ A x ≤
y) |