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Theorem dvgt0lem1 23985

Description: Lemma for dvgt0 23987 and dvlt0 23988. (Contributed by Mario Carneiro, 19-Feb-2015.)

**Hypotheses**
Ref	Expression
dvgt0.a	⊢ (𝜑 → 𝐴 ∈ ℝ)
dvgt0.b	⊢ (𝜑 → 𝐵 ∈ ℝ)
dvgt0.f	⊢ (𝜑 → 𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ))
dvgt0lem.d	⊢ (𝜑 → (ℝ D 𝐹):(𝐴(,)𝐵)⟶𝑆)

**Assertion**
Ref	Expression
dvgt0lem1	⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (((𝐹‘𝑌) − (𝐹‘𝑋)) / (𝑌 − 𝑋)) ∈ 𝑆)

Proof of Theorem dvgt0lem1 Dummy variable 𝑧 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		iccssxr 12470	. . . . . . 7 ⊢ (𝐴[,]𝐵) ⊆ ℝ^*
2		simplrl 819	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ (𝐴[,]𝐵))
3	1, 2	sseldi 3743	. . . . . 6 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ ℝ^*)
4		simplrr 820	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈ (𝐴[,]𝐵))
5	1, 4	sseldi 3743	. . . . . 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 12469	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ⊆ ℝ)
9	6, 7, 8	syl2anc 696	. . . . . . . . 9 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ ℝ)
10	9	ad2antrr 764	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝐴[,]𝐵) ⊆ ℝ)
11	10, 2	sseldd 3746	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ ℝ)
12	10, 4	sseldd 3746	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈ ℝ)
13		simpr 479	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 < 𝑌)
14	11, 12, 13	ltled 10398	. . . . . 6 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ≤ 𝑌)
15		ubicc2 12503	. . . . . 6 ⊢ ((𝑋 ∈ ℝ^* ∧ 𝑌 ∈ ℝ^* ∧ 𝑋 ≤ 𝑌) → 𝑌 ∈ (𝑋[,]𝑌))
16	3, 5, 14, 15	syl3anc 1477	. . . . 5 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈ (𝑋[,]𝑌))
17		fvres 6370	. . . . 5 ⊢ (𝑌 ∈ (𝑋[,]𝑌) → ((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) = (𝐹‘𝑌))
18	16, 17	syl 17	. . . 4 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) = (𝐹‘𝑌))
19		lbicc2 12502	. . . . . 6 ⊢ ((𝑋 ∈ ℝ^* ∧ 𝑌 ∈ ℝ^* ∧ 𝑋 ≤ 𝑌) → 𝑋 ∈ (𝑋[,]𝑌))
20	3, 5, 14, 19	syl3anc 1477	. . . . 5 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ (𝑋[,]𝑌))
21		fvres 6370	. . . . 5 ⊢ (𝑋 ∈ (𝑋[,]𝑌) → ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋) = (𝐹‘𝑋))
22	20, 21	syl 17	. . . 4 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋) = (𝐹‘𝑋))
23	18, 22	oveq12d 6833	. . 3 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) = ((𝐹‘𝑌) − (𝐹‘𝑋)))
24	23	oveq1d 6830	. 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)))
25		iccss2 12458	. . . . . 6 ⊢ ((𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵)) → (𝑋[,]𝑌) ⊆ (𝐴[,]𝐵))
26	25	ad2antlr 765	. . . . 5 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋[,]𝑌) ⊆ (𝐴[,]𝐵))
27		dvgt0.f	. . . . . 6 ⊢ (𝜑 → 𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ))
28	27	ad2antrr 764	. . . . 5 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ))
29		rescncf 22922	. . . . 5 ⊢ ((𝑋[,]𝑌) ⊆ (𝐴[,]𝐵) → (𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ) → (𝐹 ↾ (𝑋[,]𝑌)) ∈ ((𝑋[,]𝑌)–cn→ℝ)))
30	26, 28, 29	sylc 65	. . . 4 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝐹 ↾ (𝑋[,]𝑌)) ∈ ((𝑋[,]𝑌)–cn→ℝ))
31		dvgt0lem.d	. . . . . . . 8 ⊢ (𝜑 → (ℝ D 𝐹):(𝐴(,)𝐵)⟶𝑆)
32	31	ad2antrr 764	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D 𝐹):(𝐴(,)𝐵)⟶𝑆)
33	6	ad2antrr 764	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐴 ∈ ℝ)
34	33	rexrd 10302	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐴 ∈ ℝ^*)
35	7	ad2antrr 764	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐵 ∈ ℝ)
36		elicc2 12452	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑋 ∈ (𝐴[,]𝐵) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵)))
37	33, 35, 36	syl2anc 696	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋 ∈ (𝐴[,]𝐵) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵)))
38	2, 37	mpbid 222	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵))
39	38	simp2d 1138	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐴 ≤ 𝑋)
40		iooss1 12424	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐴 ≤ 𝑋) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌))
41	34, 39, 40	syl2anc 696	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌))
42	35	rexrd 10302	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐵 ∈ ℝ^*)
43		elicc2 12452	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑌 ∈ (𝐴[,]𝐵) ↔ (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵)))
44	33, 35, 43	syl2anc 696	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑌 ∈ (𝐴[,]𝐵) ↔ (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵)))
45	4, 44	mpbid 222	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵))
46	45	simp3d 1139	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ≤ 𝐵)
47		iooss2 12425	. . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝑌 ≤ 𝐵) → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵))
48	42, 46, 47	syl2anc 696	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵))
49	41, 48	sstrd 3755	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝐵))
50	32, 49	fssresd 6233	. . . . . 6 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((ℝ D 𝐹) ↾ (𝑋(,)𝑌)):(𝑋(,)𝑌)⟶𝑆)
51		ax-resscn 10206	. . . . . . . . . 10 ⊢ ℝ ⊆ ℂ
52	51	a1i 11	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ℝ ⊆ ℂ)
53		cncff 22918	. . . . . . . . . . . 12 ⊢ (𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ) → 𝐹:(𝐴[,]𝐵)⟶ℝ)
54	27, 53	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐹:(𝐴[,]𝐵)⟶ℝ)
55	54	ad2antrr 764	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐹:(𝐴[,]𝐵)⟶ℝ)
56		fss 6218	. . . . . . . . . 10 ⊢ ((𝐹:(𝐴[,]𝐵)⟶ℝ ∧ ℝ ⊆ ℂ) → 𝐹:(𝐴[,]𝐵)⟶ℂ)
57	55, 51, 56	sylancl 697	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐹:(𝐴[,]𝐵)⟶ℂ)
58		iccssre 12469	. . . . . . . . . 10 ⊢ ((𝑋 ∈ ℝ ∧ 𝑌 ∈ ℝ) → (𝑋[,]𝑌) ⊆ ℝ)
59	11, 12, 58	syl2anc 696	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋[,]𝑌) ⊆ ℝ)
60		eqid 2761	. . . . . . . . . 10 ⊢ (TopOpen‘ℂ_fld) = (TopOpen‘ℂ_fld)
61	60	tgioo2 22828	. . . . . . . . . 10 ⊢ (topGen‘ran (,)) = ((TopOpen‘ℂ_fld) ↾_t ℝ)
62	60, 61	dvres 23895	. . . . . . . . 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))))
63	52, 57, 10, 59, 62	syl22anc 1478	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D (𝐹 ↾ (𝑋[,]𝑌))) = ((ℝ D 𝐹) ↾ ((int‘(topGen‘ran (,)))‘(𝑋[,]𝑌))))
64		iccntr 22846	. . . . . . . . . 10 ⊢ ((𝑋 ∈ ℝ ∧ 𝑌 ∈ ℝ) → ((int‘(topGen‘ran (,)))‘(𝑋[,]𝑌)) = (𝑋(,)𝑌))
65	11, 12, 64	syl2anc 696	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((int‘(topGen‘ran (,)))‘(𝑋[,]𝑌)) = (𝑋(,)𝑌))
66	65	reseq2d 5552	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((ℝ D 𝐹) ↾ ((int‘(topGen‘ran (,)))‘(𝑋[,]𝑌))) = ((ℝ D 𝐹) ↾ (𝑋(,)𝑌)))
67	63, 66	eqtrd 2795	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D (𝐹 ↾ (𝑋[,]𝑌))) = ((ℝ D 𝐹) ↾ (𝑋(,)𝑌)))
68	67	feq1d 6192	. . . . . 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))
69	50, 68	mpbird 247	. . . . 5 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D (𝐹 ↾ (𝑋[,]𝑌))):(𝑋(,)𝑌)⟶𝑆)
70		fdm 6213	. . . . 5 ⊢ ((ℝ D (𝐹 ↾ (𝑋[,]𝑌))):(𝑋(,)𝑌)⟶𝑆 → dom (ℝ D (𝐹 ↾ (𝑋[,]𝑌))) = (𝑋(,)𝑌))
71	69, 70	syl 17	. . . 4 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → dom (ℝ D (𝐹 ↾ (𝑋[,]𝑌))) = (𝑋(,)𝑌))
72	11, 12, 13, 30, 71	mvth 23975	. . 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)))
73	69	ffvelrnda 6524	. . . . 5 ⊢ ((((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) ∧ 𝑧 ∈ (𝑋(,)𝑌)) → ((ℝ D (𝐹 ↾ (𝑋[,]𝑌)))‘𝑧) ∈ 𝑆)
74		eleq1 2828	. . . . 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))
75	73, 74	syl5ibcom 235	. . . 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))
76	75	rexlimdva 3170	. . 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))
77	72, 76	mpd 15	. 2 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) − ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋)) / (𝑌 − 𝑋)) ∈ 𝑆)
78	24, 77	eqeltrrd 2841	1 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (((𝐹‘𝑌) − (𝐹‘𝑋)) / (𝑌 − 𝑋)) ∈ 𝑆)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 196 ∧ wa 383 ∧ w3a 1072 = wceq 1632 ∈ wcel 2140 ∃wrex 3052 ⊆ wss 3716 class class class wbr 4805 dom cdm 5267 ran crn 5268 ↾ cres 5269 ⟶wf 6046 ‘cfv 6050 (class class class)co 6815 ℂcc 10147 ℝcr 10148 ℝ^*cxr 10286 < clt 10287 ≤ cle 10288 − cmin 10479 / cdiv 10897 (,)cioo 12389 [,]cicc 12392 TopOpenctopn 16305 topGenctg 16321 ℂ_fldccnfld 19969 intcnt 21044 –cn→ccncf 22901 D cdv 23847

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1871 ax-4 1886 ax-5 1989 ax-6 2055 ax-7 2091 ax-8 2142 ax-9 2149 ax-10 2169 ax-11 2184 ax-12 2197 ax-13 2392 ax-ext 2741 ax-rep 4924 ax-sep 4934 ax-nul 4942 ax-pow 4993 ax-pr 5056 ax-un 7116 ax-inf2 8714 ax-cnex 10205 ax-resscn 10206 ax-1cn 10207 ax-icn 10208 ax-addcl 10209 ax-addrcl 10210 ax-mulcl 10211 ax-mulrcl 10212 ax-mulcom 10213 ax-addass 10214 ax-mulass 10215 ax-distr 10216 ax-i2m1 10217 ax-1ne0 10218 ax-1rid 10219 ax-rnegex 10220 ax-rrecex 10221 ax-cnre 10222 ax-pre-lttri 10223 ax-pre-lttrn 10224 ax-pre-ltadd 10225 ax-pre-mulgt0 10226 ax-pre-sup 10227 ax-addf 10228 ax-mulf 10229

This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-3or 1073 df-3an 1074 df-tru 1635 df-ex 1854 df-nf 1859 df-sb 2048 df-eu 2612 df-mo 2613 df-clab 2748 df-cleq 2754 df-clel 2757 df-nfc 2892 df-ne 2934 df-nel 3037 df-ral 3056 df-rex 3057 df-reu 3058 df-rmo 3059 df-rab 3060 df-v 3343 df-sbc 3578 df-csb 3676 df-dif 3719 df-un 3721 df-in 3723 df-ss 3730 df-pss 3732 df-nul 4060 df-if 4232 df-pw 4305 df-sn 4323 df-pr 4325 df-tp 4327 df-op 4329 df-uni 4590 df-int 4629 df-iun 4675 df-iin 4676 df-br 4806 df-opab 4866 df-mpt 4883 df-tr 4906 df-id 5175 df-eprel 5180 df-po 5188 df-so 5189 df-fr 5226 df-se 5227 df-we 5228 df-xp 5273 df-rel 5274 df-cnv 5275 df-co 5276 df-dm 5277 df-rn 5278 df-res 5279 df-ima 5280 df-pred 5842 df-ord 5888 df-on 5889 df-lim 5890 df-suc 5891 df-iota 6013 df-fun 6052 df-fn 6053 df-f 6054 df-f1 6055 df-fo 6056 df-f1o 6057 df-fv 6058 df-isom 6059 df-riota 6776 df-ov 6818 df-oprab 6819 df-mpt2 6820 df-of 7064 df-om 7233 df-1st 7335 df-2nd 7336 df-supp 7466 df-wrecs 7578 df-recs 7639 df-rdg 7677 df-1o 7731 df-2o 7732 df-oadd 7735 df-er 7914 df-map 8028 df-pm 8029 df-ixp 8078 df-en 8125 df-dom 8126 df-sdom 8127 df-fin 8128 df-fsupp 8444 df-fi 8485 df-sup 8516 df-inf 8517 df-oi 8583 df-card 8976 df-cda 9203 df-pnf 10289 df-mnf 10290 df-xr 10291 df-ltxr 10292 df-le 10293 df-sub 10481 df-neg 10482 df-div 10898 df-nn 11234 df-2 11292 df-3 11293 df-4 11294 df-5 11295 df-6 11296 df-7 11297 df-8 11298 df-9 11299 df-n0 11506 df-z 11591 df-dec 11707 df-uz 11901 df-q 12003 df-rp 12047 df-xneg 12160 df-xadd 12161 df-xmul 12162 df-ioo 12393 df-ico 12395 df-icc 12396 df-fz 12541 df-fzo 12681 df-seq 13017 df-exp 13076 df-hash 13333 df-cj 14059 df-re 14060 df-im 14061 df-sqrt 14195 df-abs 14196 df-struct 16082 df-ndx 16083 df-slot 16084 df-base 16086 df-sets 16087 df-ress 16088 df-plusg 16177 df-mulr 16178 df-starv 16179 df-sca 16180 df-vsca 16181 df-ip 16182 df-tset 16183 df-ple 16184 df-ds 16187 df-unif 16188 df-hom 16189 df-cco 16190 df-rest 16306 df-topn 16307 df-0g 16325 df-gsum 16326 df-topgen 16327 df-pt 16328 df-prds 16331 df-xrs 16385 df-qtop 16390 df-imas 16391 df-xps 16393 df-mre 16469 df-mrc 16470 df-acs 16472 df-mgm 17464 df-sgrp 17506 df-mnd 17517 df-submnd 17558 df-mulg 17763 df-cntz 17971 df-cmn 18416 df-psmet 19961 df-xmet 19962 df-met 19963 df-bl 19964 df-mopn 19965 df-fbas 19966 df-fg 19967 df-cnfld 19970 df-top 20922 df-topon 20939 df-topsp 20960 df-bases 20973 df-cld 21046 df-ntr 21047 df-cls 21048 df-nei 21125 df-lp 21163 df-perf 21164 df-cn 21254 df-cnp 21255 df-haus 21342 df-cmp 21413 df-tx 21588 df-hmeo 21781 df-fil 21872 df-fm 21964 df-flim 21965 df-flf 21966 df-xms 22347 df-ms 22348 df-tms 22349 df-cncf 22903 df-limc 23850 df-dv 23851

This theorem is referenced by: dvgt0 23987 dvlt0 23988 dvge0 23989

W3C validator