Proof of Theorem cau4i
| Step | Hyp | Ref
| Expression |
| 1 | | cau4i.2 |
. . . 4
⊢ Z = (ℤ≥ ‘M) |
| 2 | | rexeq1 1794 |
. . . 4
⊢ (Z = (ℤ≥ ‘M) → (∃j ∈ Z ∀k ∈ Z (j ≤ k →
φ) ↔ ∃j ∈ (ℤ≥ ‘M)∀k ∈ Z (j ≤
k → φ))) |
| 3 | 1, 2 | ax-mp 7 |
. . 3
⊢ (∃j ∈ Z ∀k ∈ Z (j ≤ k →
φ) ↔ ∃j ∈ (ℤ≥ ‘M)∀k ∈ Z (j ≤
k → φ)) |
| 4 | | cau4i.1 |
. . . 4
⊢ M ∈ ℤ |
| 5 | | rexuz 6394 |
. . . 4
⊢ (M ∈ ℤ → (∃j ∈ (ℤ≥ ‘M)∀k ∈ Z (j ≤
k → φ) ↔ ∃j ∈ ℤ (M ≤ j ⋀ ∀k ∈ Z (j ≤
k → φ)))) |
| 6 | 4, 5 | ax-mp 7 |
. . 3
⊢ (∃j ∈ (ℤ≥ ‘M)∀k ∈ Z (j ≤
k → φ) ↔ ∃j ∈ ℤ (M ≤ j ⋀ ∀k ∈ Z (j ≤
k → φ))) |
| 7 | 3, 6 | bitr 173 |
. 2
⊢ (∃j ∈ Z ∀k ∈ Z (j ≤ k →
φ) ↔ ∃j ∈ ℤ (M ≤ j ⋀ ∀k ∈ Z (j ≤
k → φ))) |
| 8 | 4 | zre 6147 |
. . . . . . . . . . . . . 14
⊢ M ∈ ℝ |
| 9 | | letrt 5538 |
. . . . . . . . . . . . . 14
⊢ ((M ∈ ℝ ⋀ j ∈ ℝ ⋀ k ∈ ℝ) → ((M
≤ j ⋀
j ≤ k) → M ≤
k)) |
| 10 | 8, 9 | mp3an1 907 |
. . . . . . . . . . . . 13
⊢ ((j ∈ ℝ ⋀ k ∈ ℝ) → ((M
≤ j ⋀
j ≤ k) → M ≤
k)) |
| 11 | | zret 6145 |
. . . . . . . . . . . . 13
⊢ (j ∈ ℤ → j
∈ ℝ) |
| 12 | | zret 6145 |
. . . . . . . . . . . . 13
⊢ (k ∈ ℤ → k
∈ ℝ) |
| 13 | 10, 11, 12 | syl2an 457 |
. . . . . . . . . . . 12
⊢ ((j ∈ ℤ ⋀ k ∈ ℤ) → ((M
≤ j ⋀
j ≤ k) → M ≤
k)) |
| 14 | 13 | exp4b 381 |
. . . . . . . . . . 11
⊢ (j ∈ ℤ → (k
∈ ℤ →
(M ≤ j → (j ≤
k → M ≤ k)))) |
| 15 | 14 | com23 32 |
. . . . . . . . . 10
⊢ (j ∈ ℤ → (M
≤ j → (k ∈ ℤ → (j
≤ k → M ≤ k)))) |
| 16 | 15 | imp31 362 |
. . . . . . . . 9
⊢ (((j ∈ ℤ ⋀ M ≤ j) ⋀ k ∈ ℤ) →
(j ≤ k → M ≤
k)) |
| 17 | 16 | ancrd 299 |
. . . . . . . 8
⊢ (((j ∈ ℤ ⋀ M ≤ j) ⋀ k ∈ ℤ) →
(j ≤ k → (M ≤
k ⋀
j ≤ k))) |
| 18 | 17 | imim1d 28 |
. . . . . . 7
⊢ (((j ∈ ℤ ⋀ M ≤ j) ⋀ k ∈ ℤ) →
(((M ≤ k ⋀ j ≤ k) →
φ) → (j ≤ k →
φ))) |
| 19 | | impexp 347 |
. . . . . . 7
⊢ (((M ≤ k ⋀ j ≤
k) → φ) ↔ (M ≤ k →
(j ≤ k → φ))) |
| 20 | 18, 19 | syl5ibr 207 |
. . . . . 6
⊢ (((j ∈ ℤ ⋀ M ≤ j) ⋀ k ∈ ℤ) →
((M ≤ k → (j ≤
k → φ)) → (j ≤ k →
φ))) |
| 21 | 20 | r19.20dva 1716 |
. . . . 5
⊢ ((j ∈ ℤ ⋀ M ≤ j) →
(∀k
∈ ℤ
(M ≤ k → (j ≤
k → φ)) → ∀k ∈ ℤ (j ≤ k →
φ))) |
| 22 | | raleq1 1793 |
. . . . . . 7
⊢ (Z = (ℤ≥ ‘M) → (∀k ∈ Z (j ≤ k →
φ) ↔ ∀k ∈ (ℤ≥ ‘M)(j ≤
k → φ))) |
| 23 | 1, 22 | ax-mp 7 |
. . . . . 6
⊢ (∀k ∈ Z (j ≤ k →
φ) ↔ ∀k ∈ (ℤ≥ ‘M)(j ≤
k → φ)) |
| 24 | | raluz 6392 |
. . . . . . 7
⊢ (M ∈ ℤ → (∀k ∈ (ℤ≥ ‘M)(j ≤
k → φ) ↔ ∀k ∈ ℤ (M ≤ k →
(j ≤ k → φ)))) |
| 25 | 4, 24 | ax-mp 7 |
. . . . . 6
⊢ (∀k ∈ (ℤ≥ ‘M)(j ≤
k → φ) ↔ ∀k ∈ ℤ (M ≤ k →
(j ≤ k → φ))) |
| 26 | 23, 25 | bitr 173 |
. . . . 5
⊢ (∀k ∈ Z (j ≤ k →
φ) ↔ ∀k ∈ ℤ (M ≤ k →
(j ≤ k → φ))) |
| 27 | 21, 26 | syl5ib 206 |
. . . 4
⊢ ((j ∈ ℤ ⋀ M ≤ j) →
(∀k
∈ Z
(j ≤ k → φ)
→ ∀k ∈ ℤ (j ≤
k → φ))) |
| 28 | 27 | expimpd 375 |
. . 3
⊢ (j ∈ ℤ → ((M
≤ j ⋀
∀k
∈ Z
(j ≤ k → φ))
→ ∀k ∈ ℤ (j ≤
k → φ))) |
| 29 | 28 | r19.22i 1739 |
. 2
⊢ (∃j ∈ ℤ (M ≤ j ⋀ ∀k ∈ Z (j ≤
k → φ)) → ∃j ∈ ℤ ∀k ∈ ℤ (j ≤ k →
φ)) |
| 30 | 7, 29 | sylbi 199 |
1
⊢ (∃j ∈ Z ∀k ∈ Z (j ≤ k →
φ) → ∃j ∈ ℤ ∀k ∈ ℤ (j ≤ k →
φ)) |