Proof of Theorem fzmaxdif
Step | Hyp | Ref
| Expression |
1 | | simp2r 1192 |
. . . . . 6
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐷 ∈ (𝐸...𝐹)) |
2 | | elfzelz 12896 |
. . . . . 6
⊢ (𝐷 ∈ (𝐸...𝐹) → 𝐷 ∈ ℤ) |
3 | 1, 2 | syl 17 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐷 ∈ ℤ) |
4 | 3 | zred 12075 |
. . . 4
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐷 ∈ ℝ) |
5 | | simp2l 1191 |
. . . . . 6
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐹 ∈ ℤ) |
6 | 5 | zred 12075 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐹 ∈ ℝ) |
7 | | simp1r 1190 |
. . . . . . 7
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐴 ∈ (𝐵...𝐶)) |
8 | | elfzel1 12895 |
. . . . . . 7
⊢ (𝐴 ∈ (𝐵...𝐶) → 𝐵 ∈ ℤ) |
9 | 7, 8 | syl 17 |
. . . . . 6
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐵 ∈ ℤ) |
10 | 9 | zred 12075 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐵 ∈ ℝ) |
11 | 6, 10 | resubcld 11056 |
. . . 4
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐹 − 𝐵) ∈ ℝ) |
12 | 4, 11 | resubcld 11056 |
. . 3
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐷 − (𝐹 − 𝐵)) ∈ ℝ) |
13 | | elfzelz 12896 |
. . . . 5
⊢ (𝐴 ∈ (𝐵...𝐶) → 𝐴 ∈ ℤ) |
14 | 7, 13 | syl 17 |
. . . 4
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐴 ∈ ℤ) |
15 | 14 | zred 12075 |
. . 3
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐴 ∈ ℝ) |
16 | | elfzle2 12899 |
. . . . . 6
⊢ (𝐷 ∈ (𝐸...𝐹) → 𝐷 ≤ 𝐹) |
17 | 1, 16 | syl 17 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐷 ≤ 𝐹) |
18 | 4, 6, 11, 17 | lesub1dd 11244 |
. . . 4
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐷 − (𝐹 − 𝐵)) ≤ (𝐹 − (𝐹 − 𝐵))) |
19 | 6 | recnd 10657 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐹 ∈ ℂ) |
20 | 10 | recnd 10657 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐵 ∈ ℂ) |
21 | 19, 20 | nncand 10990 |
. . . 4
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐹 − (𝐹 − 𝐵)) = 𝐵) |
22 | 18, 21 | breqtrd 5083 |
. . 3
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐷 − (𝐹 − 𝐵)) ≤ 𝐵) |
23 | | elfzle1 12898 |
. . . 4
⊢ (𝐴 ∈ (𝐵...𝐶) → 𝐵 ≤ 𝐴) |
24 | 7, 23 | syl 17 |
. . 3
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐵 ≤ 𝐴) |
25 | 12, 10, 15, 22, 24 | letrd 10785 |
. 2
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐷 − (𝐹 − 𝐵)) ≤ 𝐴) |
26 | | simp1l 1189 |
. . . 4
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐶 ∈ ℤ) |
27 | 26 | zred 12075 |
. . 3
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐶 ∈ ℝ) |
28 | 4, 11 | readdcld 10658 |
. . 3
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐷 + (𝐹 − 𝐵)) ∈ ℝ) |
29 | | elfzle2 12899 |
. . . 4
⊢ (𝐴 ∈ (𝐵...𝐶) → 𝐴 ≤ 𝐶) |
30 | 7, 29 | syl 17 |
. . 3
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐴 ≤ 𝐶) |
31 | 27, 4 | resubcld 11056 |
. . . . . 6
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐶 − 𝐷) ∈ ℝ) |
32 | | elfzel1 12895 |
. . . . . . . . 9
⊢ (𝐷 ∈ (𝐸...𝐹) → 𝐸 ∈ ℤ) |
33 | 1, 32 | syl 17 |
. . . . . . . 8
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐸 ∈ ℤ) |
34 | 33 | zred 12075 |
. . . . . . 7
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐸 ∈ ℝ) |
35 | 27, 34 | resubcld 11056 |
. . . . . 6
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐶 − 𝐸) ∈ ℝ) |
36 | | elfzle1 12898 |
. . . . . . . 8
⊢ (𝐷 ∈ (𝐸...𝐹) → 𝐸 ≤ 𝐷) |
37 | 1, 36 | syl 17 |
. . . . . . 7
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐸 ≤ 𝐷) |
38 | 34, 4, 27, 37 | lesub2dd 11245 |
. . . . . 6
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐶 − 𝐷) ≤ (𝐶 − 𝐸)) |
39 | | simp3 1130 |
. . . . . 6
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) |
40 | 31, 35, 11, 38, 39 | letrd 10785 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐶 − 𝐷) ≤ (𝐹 − 𝐵)) |
41 | 27, 4, 11 | lesubaddd 11225 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → ((𝐶 − 𝐷) ≤ (𝐹 − 𝐵) ↔ 𝐶 ≤ ((𝐹 − 𝐵) + 𝐷))) |
42 | 40, 41 | mpbid 233 |
. . . 4
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐶 ≤ ((𝐹 − 𝐵) + 𝐷)) |
43 | 11 | recnd 10657 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (𝐹 − 𝐵) ∈ ℂ) |
44 | 4 | recnd 10657 |
. . . . 5
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐷 ∈ ℂ) |
45 | 43, 44 | addcomd 10830 |
. . . 4
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → ((𝐹 − 𝐵) + 𝐷) = (𝐷 + (𝐹 − 𝐵))) |
46 | 42, 45 | breqtrd 5083 |
. . 3
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐶 ≤ (𝐷 + (𝐹 − 𝐵))) |
47 | 15, 27, 28, 30, 46 | letrd 10785 |
. 2
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → 𝐴 ≤ (𝐷 + (𝐹 − 𝐵))) |
48 | 15, 4, 11 | absdifled 14782 |
. 2
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → ((abs‘(𝐴 − 𝐷)) ≤ (𝐹 − 𝐵) ↔ ((𝐷 − (𝐹 − 𝐵)) ≤ 𝐴 ∧ 𝐴 ≤ (𝐷 + (𝐹 − 𝐵))))) |
49 | 25, 47, 48 | mpbir2and 709 |
1
⊢ (((𝐶 ∈ ℤ ∧ 𝐴 ∈ (𝐵...𝐶)) ∧ (𝐹 ∈ ℤ ∧ 𝐷 ∈ (𝐸...𝐹)) ∧ (𝐶 − 𝐸) ≤ (𝐹 − 𝐵)) → (abs‘(𝐴 − 𝐷)) ≤ (𝐹 − 𝐵)) |