Step | Hyp | Ref
| Expression |
1 | | iccssxr 13162 |
. . . . . . 7
⊢ (𝐴[,]𝐵) ⊆
ℝ* |
2 | | simplrl 774 |
. . . . . . 7
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ (𝐴[,]𝐵)) |
3 | 1, 2 | sselid 3919 |
. . . . . 6
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈
ℝ*) |
4 | | simplrr 775 |
. . . . . . 7
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈ (𝐴[,]𝐵)) |
5 | 1, 4 | sselid 3919 |
. . . . . 6
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈
ℝ*) |
6 | | dvgt0.a |
. . . . . . . . . 10
⊢ (𝜑 → 𝐴 ∈ ℝ) |
7 | | dvgt0.b |
. . . . . . . . . 10
⊢ (𝜑 → 𝐵 ∈ ℝ) |
8 | | iccssre 13161 |
. . . . . . . . . 10
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ⊆ ℝ) |
9 | 6, 7, 8 | syl2anc 584 |
. . . . . . . . 9
⊢ (𝜑 → (𝐴[,]𝐵) ⊆ ℝ) |
10 | 9 | ad2antrr 723 |
. . . . . . . 8
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝐴[,]𝐵) ⊆ ℝ) |
11 | 10, 2 | sseldd 3922 |
. . . . . . 7
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ ℝ) |
12 | 10, 4 | sseldd 3922 |
. . . . . . 7
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈ ℝ) |
13 | | simpr 485 |
. . . . . . 7
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 < 𝑌) |
14 | 11, 12, 13 | ltled 11123 |
. . . . . 6
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ≤ 𝑌) |
15 | | ubicc2 13197 |
. . . . . 6
⊢ ((𝑋 ∈ ℝ*
∧ 𝑌 ∈
ℝ* ∧ 𝑋
≤ 𝑌) → 𝑌 ∈ (𝑋[,]𝑌)) |
16 | 3, 5, 14, 15 | syl3anc 1370 |
. . . . 5
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈ (𝑋[,]𝑌)) |
17 | 16 | fvresd 6794 |
. . . 4
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) = (𝐹‘𝑌)) |
18 | | lbicc2 13196 |
. . . . . 6
⊢ ((𝑋 ∈ ℝ*
∧ 𝑌 ∈
ℝ* ∧ 𝑋
≤ 𝑌) → 𝑋 ∈ (𝑋[,]𝑌)) |
19 | 3, 5, 14, 18 | syl3anc 1370 |
. . . . 5
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ (𝑋[,]𝑌)) |
20 | 19 | fvresd 6794 |
. . . 4
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋) = (𝐹‘𝑋)) |
21 | 17, 20 | oveq12d 7293 |
. . 3
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) = ((𝐹‘𝑌) − (𝐹‘𝑋))) |
22 | 21 | oveq1d 7290 |
. 2
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋)) = (((𝐹‘𝑌) − (𝐹‘𝑋)) / (𝑌 − 𝑋))) |
23 | | iccss2 13150 |
. . . . . 6
⊢ ((𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵)) → (𝑋[,]𝑌) ⊆ (𝐴[,]𝐵)) |
24 | 23 | ad2antlr 724 |
. . . . 5
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋[,]𝑌) ⊆ (𝐴[,]𝐵)) |
25 | | dvgt0.f |
. . . . . 6
⊢ (𝜑 → 𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ)) |
26 | 25 | ad2antrr 723 |
. . . . 5
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ)) |
27 | | rescncf 24060 |
. . . . 5
⊢ ((𝑋[,]𝑌) ⊆ (𝐴[,]𝐵) → (𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ) → (𝐹 ↾ (𝑋[,]𝑌)) ∈ ((𝑋[,]𝑌)–cn→ℝ))) |
28 | 24, 26, 27 | sylc 65 |
. . . 4
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝐹 ↾ (𝑋[,]𝑌)) ∈ ((𝑋[,]𝑌)–cn→ℝ)) |
29 | | dvgt0lem.d |
. . . . . . . 8
⊢ (𝜑 → (ℝ D 𝐹):(𝐴(,)𝐵)⟶𝑆) |
30 | 29 | ad2antrr 723 |
. . . . . . 7
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D 𝐹):(𝐴(,)𝐵)⟶𝑆) |
31 | 6 | ad2antrr 723 |
. . . . . . . . . 10
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐴 ∈ ℝ) |
32 | 31 | rexrd 11025 |
. . . . . . . . 9
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐴 ∈
ℝ*) |
33 | 7 | ad2antrr 723 |
. . . . . . . . . . . 12
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐵 ∈ ℝ) |
34 | | elicc2 13144 |
. . . . . . . . . . . 12
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑋 ∈ (𝐴[,]𝐵) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵))) |
35 | 31, 33, 34 | syl2anc 584 |
. . . . . . . . . . 11
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋 ∈ (𝐴[,]𝐵) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵))) |
36 | 2, 35 | mpbid 231 |
. . . . . . . . . 10
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵)) |
37 | 36 | simp2d 1142 |
. . . . . . . . 9
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐴 ≤ 𝑋) |
38 | | iooss1 13114 |
. . . . . . . . 9
⊢ ((𝐴 ∈ ℝ*
∧ 𝐴 ≤ 𝑋) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌)) |
39 | 32, 37, 38 | syl2anc 584 |
. . . . . . . 8
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌)) |
40 | 33 | rexrd 11025 |
. . . . . . . . 9
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐵 ∈
ℝ*) |
41 | | elicc2 13144 |
. . . . . . . . . . . 12
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑌 ∈ (𝐴[,]𝐵) ↔ (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵))) |
42 | 31, 33, 41 | syl2anc 584 |
. . . . . . . . . . 11
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑌 ∈ (𝐴[,]𝐵) ↔ (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵))) |
43 | 4, 42 | mpbid 231 |
. . . . . . . . . 10
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵)) |
44 | 43 | simp3d 1143 |
. . . . . . . . 9
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ≤ 𝐵) |
45 | | iooss2 13115 |
. . . . . . . . 9
⊢ ((𝐵 ∈ ℝ*
∧ 𝑌 ≤ 𝐵) → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵)) |
46 | 40, 44, 45 | syl2anc 584 |
. . . . . . . 8
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵)) |
47 | 39, 46 | sstrd 3931 |
. . . . . . 7
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝐵)) |
48 | 30, 47 | fssresd 6641 |
. . . . . 6
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((ℝ D 𝐹) ↾ (𝑋(,)𝑌)):(𝑋(,)𝑌)⟶𝑆) |
49 | | ax-resscn 10928 |
. . . . . . . . . 10
⊢ ℝ
⊆ ℂ |
50 | 49 | a1i 11 |
. . . . . . . . 9
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ℝ ⊆
ℂ) |
51 | | cncff 24056 |
. . . . . . . . . . . 12
⊢ (𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ) → 𝐹:(𝐴[,]𝐵)⟶ℝ) |
52 | 25, 51 | syl 17 |
. . . . . . . . . . 11
⊢ (𝜑 → 𝐹:(𝐴[,]𝐵)⟶ℝ) |
53 | 52 | ad2antrr 723 |
. . . . . . . . . 10
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐹:(𝐴[,]𝐵)⟶ℝ) |
54 | | fss 6617 |
. . . . . . . . . 10
⊢ ((𝐹:(𝐴[,]𝐵)⟶ℝ ∧ ℝ ⊆
ℂ) → 𝐹:(𝐴[,]𝐵)⟶ℂ) |
55 | 53, 49, 54 | sylancl 586 |
. . . . . . . . 9
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐹:(𝐴[,]𝐵)⟶ℂ) |
56 | | iccssre 13161 |
. . . . . . . . . 10
⊢ ((𝑋 ∈ ℝ ∧ 𝑌 ∈ ℝ) → (𝑋[,]𝑌) ⊆ ℝ) |
57 | 11, 12, 56 | syl2anc 584 |
. . . . . . . . 9
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋[,]𝑌) ⊆ ℝ) |
58 | | eqid 2738 |
. . . . . . . . . 10
⊢
(TopOpen‘ℂfld) =
(TopOpen‘ℂfld) |
59 | 58 | tgioo2 23966 |
. . . . . . . . . 10
⊢
(topGen‘ran (,)) = ((TopOpen‘ℂfld)
↾t ℝ) |
60 | 58, 59 | dvres 25075 |
. . . . . . . . 9
⊢
(((ℝ ⊆ ℂ ∧ 𝐹:(𝐴[,]𝐵)⟶ℂ) ∧ ((𝐴[,]𝐵) ⊆ ℝ ∧ (𝑋[,]𝑌) ⊆ ℝ)) → (ℝ D (𝐹 ↾ (𝑋[,]𝑌))) = ((ℝ D 𝐹) ↾ ((int‘(topGen‘ran
(,)))‘(𝑋[,]𝑌)))) |
61 | 50, 55, 10, 57, 60 | syl22anc 836 |
. . . . . . . 8
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D (𝐹 ↾ (𝑋[,]𝑌))) = ((ℝ D 𝐹) ↾ ((int‘(topGen‘ran
(,)))‘(𝑋[,]𝑌)))) |
62 | | iccntr 23984 |
. . . . . . . . . 10
⊢ ((𝑋 ∈ ℝ ∧ 𝑌 ∈ ℝ) →
((int‘(topGen‘ran (,)))‘(𝑋[,]𝑌)) = (𝑋(,)𝑌)) |
63 | 11, 12, 62 | syl2anc 584 |
. . . . . . . . 9
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((int‘(topGen‘ran
(,)))‘(𝑋[,]𝑌)) = (𝑋(,)𝑌)) |
64 | 63 | reseq2d 5891 |
. . . . . . . 8
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((ℝ D 𝐹) ↾ ((int‘(topGen‘ran
(,)))‘(𝑋[,]𝑌))) = ((ℝ D 𝐹) ↾ (𝑋(,)𝑌))) |
65 | 61, 64 | eqtrd 2778 |
. . . . . . 7
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D (𝐹 ↾ (𝑋[,]𝑌))) = ((ℝ D 𝐹) ↾ (𝑋(,)𝑌))) |
66 | 65 | feq1d 6585 |
. . . . . 6
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((ℝ D (𝐹 ↾ (𝑋[,]𝑌))):(𝑋(,)𝑌)⟶𝑆 ↔ ((ℝ D 𝐹) ↾ (𝑋(,)𝑌)):(𝑋(,)𝑌)⟶𝑆)) |
67 | 48, 66 | mpbird 256 |
. . . . 5
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D (𝐹 ↾ (𝑋[,]𝑌))):(𝑋(,)𝑌)⟶𝑆) |
68 | 67 | fdmd 6611 |
. . . 4
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → dom (ℝ D (𝐹 ↾ (𝑋[,]𝑌))) = (𝑋(,)𝑌)) |
69 | 11, 12, 13, 28, 68 | mvth 25156 |
. . 3
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ∃𝑧 ∈ (𝑋(,)𝑌)((ℝ D (𝐹 ↾ (𝑋[,]𝑌)))‘𝑧) = ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋))) |
70 | 67 | ffvelrnda 6961 |
. . . . 5
⊢ ((((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) ∧ 𝑧 ∈ (𝑋(,)𝑌)) → ((ℝ D (𝐹 ↾ (𝑋[,]𝑌)))‘𝑧) ∈ 𝑆) |
71 | | eleq1 2826 |
. . . . 5
⊢
(((ℝ D (𝐹
↾ (𝑋[,]𝑌)))‘𝑧) = ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋)) → (((ℝ D (𝐹 ↾ (𝑋[,]𝑌)))‘𝑧) ∈ 𝑆 ↔ ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋)) ∈ 𝑆)) |
72 | 70, 71 | syl5ibcom 244 |
. . . 4
⊢ ((((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) ∧ 𝑧 ∈ (𝑋(,)𝑌)) → (((ℝ D (𝐹 ↾ (𝑋[,]𝑌)))‘𝑧) = ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋)) → ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋)) ∈ 𝑆)) |
73 | 72 | rexlimdva 3213 |
. . 3
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (∃𝑧 ∈ (𝑋(,)𝑌)((ℝ D (𝐹 ↾ (𝑋[,]𝑌)))‘𝑧) = ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋)) → ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋)) ∈ 𝑆)) |
74 | 69, 73 | mpd 15 |
. 2
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋)) ∈ 𝑆) |
75 | 22, 74 | eqeltrrd 2840 |
1
⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (((𝐹‘𝑌) − (𝐹‘𝑋)) / (𝑌 − 𝑋)) ∈ 𝑆) |