Proof of Theorem uzwo5OLD
| Step | Hyp | Ref
| Expression |
| 1 | | uzwo4OLD 6212 |
. . 3
⊢ ((B ∈ ℤ ⋀ (A ⊆ {z ∈ ℤ∣B ≤ z} ⋀ A ≠ ∅)) → ∃x ∈ A ∀y ∈ A x ≤ y) |
| 2 | | ssrab2 2134 |
. . . . . . 7
⊢ {z ∈ ℤ∣B ≤ z} ⊆ ℤ |
| 3 | | zssre 6144 |
. . . . . . 7
⊢ ℤ ⊆ ℝ |
| 4 | 2, 3 | sstri 2076 |
. . . . . 6
⊢ {z ∈ ℤ∣B ≤ z} ⊆ ℝ |
| 5 | | sstr 2075 |
. . . . . 6
⊢ ((A ⊆ {z ∈ ℤ∣B ≤ z} ⋀ {z ∈ ℤ∣B ≤
z} ⊆
ℝ) → A ⊆ ℝ) |
| 6 | 4, 5 | mpan2 698 |
. . . . 5
⊢ (A ⊆ {z ∈ ℤ∣B ≤ z} →
A ⊆
ℝ) |
| 7 | | breq2 2628 |
. . . . . . . . . . 11
⊢ (y = w →
(x ≤ y ↔ x ≤
w)) |
| 8 | 7 | rcla4v 1876 |
. . . . . . . . . 10
⊢ (w ∈ A → (∀y ∈ A x ≤ y →
x ≤ w)) |
| 9 | | breq2 2628 |
. . . . . . . . . . 11
⊢ (y = x →
(w ≤ y ↔ w ≤
x)) |
| 10 | 9 | rcla4v 1876 |
. . . . . . . . . 10
⊢ (x ∈ A → (∀y ∈ A w ≤ y →
w ≤ x)) |
| 11 | 8, 10 | im2anan9 565 |
. . . . . . . . 9
⊢ ((w ∈ A ⋀ x ∈ A) → ((∀y ∈ A x ≤ y ⋀ ∀y ∈ A w ≤
y) → (x ≤ w ⋀ w ≤
x))) |
| 12 | 11 | ancoms 438 |
. . . . . . . 8
⊢ ((x ∈ A ⋀ w ∈ A) → ((∀y ∈ A x ≤ y ⋀ ∀y ∈ A w ≤
y) → (x ≤ w ⋀ w ≤
x))) |
| 13 | | ssel 2066 |
. . . . . . . . . . . . . 14
⊢ (A ⊆ ℝ → (x
∈ A
→ x ∈ ℝ)) |
| 14 | | ssel 2066 |
. . . . . . . . . . . . . 14
⊢ (A ⊆ ℝ → (w
∈ A
→ w ∈ ℝ)) |
| 15 | 13, 14 | anim12d 560 |
. . . . . . . . . . . . 13
⊢ (A ⊆ ℝ → ((x
∈ A ⋀ w ∈ A) →
(x ∈
ℝ ⋀
w ∈ ℝ))) |
| 16 | 15 | impcom 351 |
. . . . . . . . . . . 12
⊢ (((x ∈ A ⋀ w ∈ A) ⋀ A ⊆ ℝ) → (x
∈ ℝ ⋀ w ∈ ℝ)) |
| 17 | | letri3t 5529 |
. . . . . . . . . . . 12
⊢ ((x ∈ ℝ ⋀ w ∈ ℝ) → (x =
w ↔ (x ≤ w ⋀ w ≤
x))) |
| 18 | 16, 17 | syl 10 |
. . . . . . . . . . 11
⊢ (((x ∈ A ⋀ w ∈ A) ⋀ A ⊆ ℝ) → (x =
w ↔ (x ≤ w ⋀ w ≤
x))) |
| 19 | 18 | biimprd 154 |
. . . . . . . . . 10
⊢ (((x ∈ A ⋀ w ∈ A) ⋀ A ⊆ ℝ) → ((x
≤ w ⋀
w ≤ x) → x =
w)) |
| 20 | 19 | ex 373 |
. . . . . . . . 9
⊢ ((x ∈ A ⋀ w ∈ A) → (A
⊆ ℝ
→ ((x ≤ w ⋀ w ≤ x) →
x = w))) |
| 21 | 20 | com23 32 |
. . . . . . . 8
⊢ ((x ∈ A ⋀ w ∈ A) → ((x
≤ w ⋀
w ≤ x) → (A
⊆ ℝ
→ x = w))) |
| 22 | 12, 21 | syld 27 |
. . . . . . 7
⊢ ((x ∈ A ⋀ w ∈ A) → ((∀y ∈ A x ≤ y ⋀ ∀y ∈ A w ≤
y) → (A ⊆ ℝ → x =
w))) |
| 23 | 22 | com3r 35 |
. . . . . 6
⊢ (A ⊆ ℝ → ((x
∈ A ⋀ w ∈ A) →
((∀y
∈ A
x ≤ y ⋀ ∀y ∈ A w ≤ y) →
x = w))) |
| 24 | 23 | r19.21aivv 1723 |
. . . . 5
⊢ (A ⊆ ℝ → ∀x ∈ A ∀w ∈ A ((∀y ∈ A x ≤ y ⋀ ∀y ∈ A w ≤
y) → x = w)) |
| 25 | 6, 24 | syl 10 |
. . . 4
⊢ (A ⊆ {z ∈ ℤ∣B ≤ z} →
∀x
∈ A ∀w ∈ A ((∀y ∈ A x ≤ y ⋀ ∀y ∈ A w ≤
y) → x = w)) |
| 26 | 25 | ad2antrl 408 |
. . 3
⊢ ((B ∈ ℤ ⋀ (A ⊆ {z ∈ ℤ∣B ≤ z} ⋀ A ≠ ∅)) → ∀x ∈ A ∀w ∈ A ((∀y ∈ A x ≤ y ⋀ ∀y ∈ A w ≤
y) → x = w)) |
| 27 | 1, 26 | jca 288 |
. 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))) |
| 28 | | breq1 2627 |
. . . 4
⊢ (x = w →
(x ≤ y ↔ w ≤
y)) |
| 29 | 28 | ralbidv 1666 |
. . 3
⊢ (x = w →
(∀y
∈ A
x ≤ y ↔ ∀y ∈ A w ≤ y)) |
| 30 | 29 | reu4 1937 |
. 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))) |
| 31 | 27, 30 | sylibr 200 |
1
⊢ ((B ∈ ℤ ⋀ (A ⊆ {z ∈ ℤ∣B ≤ z} ⋀ A ≠ ∅)) → ∃!x ∈ A ∀y ∈ A x ≤ y) |