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Theorem dvgt0lem1 24601

Description: Lemma for dvgt0 24603 and dvlt0 24604. (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 12822	. . . . . . 7 ⊢ (𝐴[,]𝐵) ⊆ ℝ^*
2		simplrl 775	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ (𝐴[,]𝐵))
3	1, 2	sseldi 3967	. . . . . 6 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ ℝ^*)
4		simplrr 776	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈ (𝐴[,]𝐵))
5	1, 4	sseldi 3967	. . . . . 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 12821	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ⊆ ℝ)
9	6, 7, 8	syl2anc 586	. . . . . . . . 9 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ ℝ)
10	9	ad2antrr 724	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝐴[,]𝐵) ⊆ ℝ)
11	10, 2	sseldd 3970	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ ℝ)
12	10, 4	sseldd 3970	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈ ℝ)
13		simpr 487	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 < 𝑌)
14	11, 12, 13	ltled 10790	. . . . . 6 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ≤ 𝑌)
15		ubicc2 12856	. . . . . 6 ⊢ ((𝑋 ∈ ℝ^* ∧ 𝑌 ∈ ℝ^* ∧ 𝑋 ≤ 𝑌) → 𝑌 ∈ (𝑋[,]𝑌))
16	3, 5, 14, 15	syl3anc 1367	. . . . 5 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ∈ (𝑋[,]𝑌))
17	16	fvresd 6692	. . . 4 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((𝐹 ↾ (𝑋[,]𝑌))‘𝑌) = (𝐹‘𝑌))
18		lbicc2 12855	. . . . . 6 ⊢ ((𝑋 ∈ ℝ^* ∧ 𝑌 ∈ ℝ^* ∧ 𝑋 ≤ 𝑌) → 𝑋 ∈ (𝑋[,]𝑌))
19	3, 5, 14, 18	syl3anc 1367	. . . . 5 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑋 ∈ (𝑋[,]𝑌))
20	19	fvresd 6692	. . . 4 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((𝐹 ↾ (𝑋[,]𝑌))‘𝑋) = (𝐹‘𝑋))
21	17, 20	oveq12d 7176	. . 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 7173	. 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 12810	. . . . . 6 ⊢ ((𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵)) → (𝑋[,]𝑌) ⊆ (𝐴[,]𝐵))
24	23	ad2antlr 725	. . . . 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 724	. . . . 5 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ))
27		rescncf 23507	. . . . 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 724	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D 𝐹):(𝐴(,)𝐵)⟶𝑆)
31	6	ad2antrr 724	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐴 ∈ ℝ)
32	31	rexrd 10693	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐴 ∈ ℝ^*)
33	7	ad2antrr 724	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐵 ∈ ℝ)
34		elicc2 12804	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑋 ∈ (𝐴[,]𝐵) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵)))
35	31, 33, 34	syl2anc 586	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋 ∈ (𝐴[,]𝐵) ↔ (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵)))
36	2, 35	mpbid 234	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋 ∈ ℝ ∧ 𝐴 ≤ 𝑋 ∧ 𝑋 ≤ 𝐵))
37	36	simp2d 1139	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐴 ≤ 𝑋)
38		iooss1 12776	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐴 ≤ 𝑋) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌))
39	32, 37, 38	syl2anc 586	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝑌))
40	33	rexrd 10693	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐵 ∈ ℝ^*)
41		elicc2 12804	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝑌 ∈ (𝐴[,]𝐵) ↔ (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵)))
42	31, 33, 41	syl2anc 586	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑌 ∈ (𝐴[,]𝐵) ↔ (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵)))
43	4, 42	mpbid 234	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑌 ∈ ℝ ∧ 𝐴 ≤ 𝑌 ∧ 𝑌 ≤ 𝐵))
44	43	simp3d 1140	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝑌 ≤ 𝐵)
45		iooss2 12777	. . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝑌 ≤ 𝐵) → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵))
46	40, 44, 45	syl2anc 586	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝐴(,)𝑌) ⊆ (𝐴(,)𝐵))
47	39, 46	sstrd 3979	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋(,)𝑌) ⊆ (𝐴(,)𝐵))
48	30, 47	fssresd 6547	. . . . . 6 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((ℝ D 𝐹) ↾ (𝑋(,)𝑌)):(𝑋(,)𝑌)⟶𝑆)
49		ax-resscn 10596	. . . . . . . . . 10 ⊢ ℝ ⊆ ℂ
50	49	a1i 11	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ℝ ⊆ ℂ)
51		cncff 23503	. . . . . . . . . . . 12 ⊢ (𝐹 ∈ ((𝐴[,]𝐵)–cn→ℝ) → 𝐹:(𝐴[,]𝐵)⟶ℝ)
52	25, 51	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐹:(𝐴[,]𝐵)⟶ℝ)
53	52	ad2antrr 724	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐹:(𝐴[,]𝐵)⟶ℝ)
54		fss 6529	. . . . . . . . . 10 ⊢ ((𝐹:(𝐴[,]𝐵)⟶ℝ ∧ ℝ ⊆ ℂ) → 𝐹:(𝐴[,]𝐵)⟶ℂ)
55	53, 49, 54	sylancl 588	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → 𝐹:(𝐴[,]𝐵)⟶ℂ)
56		iccssre 12821	. . . . . . . . . 10 ⊢ ((𝑋 ∈ ℝ ∧ 𝑌 ∈ ℝ) → (𝑋[,]𝑌) ⊆ ℝ)
57	11, 12, 56	syl2anc 586	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (𝑋[,]𝑌) ⊆ ℝ)
58		eqid 2823	. . . . . . . . . 10 ⊢ (TopOpen‘ℂ_fld) = (TopOpen‘ℂ_fld)
59	58	tgioo2 23413	. . . . . . . . . 10 ⊢ (topGen‘ran (,)) = ((TopOpen‘ℂ_fld) ↾_t ℝ)
60	58, 59	dvres 24511	. . . . . . . . 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 23431	. . . . . . . . . 10 ⊢ ((𝑋 ∈ ℝ ∧ 𝑌 ∈ ℝ) → ((int‘(topGen‘ran (,)))‘(𝑋[,]𝑌)) = (𝑋(,)𝑌))
63	11, 12, 62	syl2anc 586	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → ((int‘(topGen‘ran (,)))‘(𝑋[,]𝑌)) = (𝑋(,)𝑌))
64	63	reseq2d 5855	. . . . . . . 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 2858	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D (𝐹 ↾ (𝑋[,]𝑌))) = ((ℝ D 𝐹) ↾ (𝑋(,)𝑌)))
66	65	feq1d 6501	. . . . . 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 259	. . . . 5 ⊢ (((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) → (ℝ D (𝐹 ↾ (𝑋[,]𝑌))):(𝑋(,)𝑌)⟶𝑆)
68	67	fdmd 6525	. . . 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 24591	. . 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 6853	. . . . 5 ⊢ ((((𝜑 ∧ (𝑋 ∈ (𝐴[,]𝐵) ∧ 𝑌 ∈ (𝐴[,]𝐵))) ∧ 𝑋 < 𝑌) ∧ 𝑧 ∈ (𝑋(,)𝑌)) → ((ℝ D (𝐹 ↾ (𝑋[,]𝑌)))‘𝑧) ∈ 𝑆)
71		eleq1 2902	. . . . 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 247	. . . 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 3286	. . 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 2916	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 208 ∧ wa 398 ∧ w3a 1083 = wceq 1537 ∈ wcel 2114 ∃wrex 3141 ⊆ wss 3938 class class class wbr 5068 ran crn 5558 ↾ cres 5559 ⟶wf 6353 ‘cfv 6357 (class class class)co 7158 ℂcc 10537 ℝcr 10538 ℝ^*cxr 10676 < clt 10677 ≤ cle 10678 − cmin 10872 / cdiv 11299 (,)cioo 12741 [,]cicc 12744 TopOpenctopn 16697 topGenctg 16713 ℂ_fldccnfld 20547 intcnt 21627 –cn→ccncf 23486 D cdv 24463

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-rep 5192 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 ax-pre-sup 10617 ax-addf 10618 ax-mulf 10619

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-int 4879 df-iun 4923 df-iin 4924 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-se 5517 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-isom 6366 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-of 7411 df-om 7583 df-1st 7691 df-2nd 7692 df-supp 7833 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-1o 8104 df-2o 8105 df-oadd 8108 df-er 8291 df-map 8410 df-pm 8411 df-ixp 8464 df-en 8512 df-dom 8513 df-sdom 8514 df-fin 8515 df-fsupp 8836 df-fi 8877 df-sup 8908 df-inf 8909 df-oi 8976 df-card 9370 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-div 11300 df-nn 11641 df-2 11703 df-3 11704 df-4 11705 df-5 11706 df-6 11707 df-7 11708 df-8 11709 df-9 11710 df-n0 11901 df-z 11985 df-dec 12102 df-uz 12247 df-q 12352 df-rp 12393 df-xneg 12510 df-xadd 12511 df-xmul 12512 df-ioo 12745 df-ico 12747 df-icc 12748 df-fz 12896 df-fzo 13037 df-seq 13373 df-exp 13433 df-hash 13694 df-cj 14460 df-re 14461 df-im 14462 df-sqrt 14596 df-abs 14597 df-struct 16487 df-ndx 16488 df-slot 16489 df-base 16491 df-sets 16492 df-ress 16493 df-plusg 16580 df-mulr 16581 df-starv 16582 df-sca 16583 df-vsca 16584 df-ip 16585 df-tset 16586 df-ple 16587 df-ds 16589 df-unif 16590 df-hom 16591 df-cco 16592 df-rest 16698 df-topn 16699 df-0g 16717 df-gsum 16718 df-topgen 16719 df-pt 16720 df-prds 16723 df-xrs 16777 df-qtop 16782 df-imas 16783 df-xps 16785 df-mre 16859 df-mrc 16860 df-acs 16862 df-mgm 17854 df-sgrp 17903 df-mnd 17914 df-submnd 17959 df-mulg 18227 df-cntz 18449 df-cmn 18910 df-psmet 20539 df-xmet 20540 df-met 20541 df-bl 20542 df-mopn 20543 df-fbas 20544 df-fg 20545 df-cnfld 20548 df-top 21504 df-topon 21521 df-topsp 21543 df-bases 21556 df-cld 21629 df-ntr 21630 df-cls 21631 df-nei 21708 df-lp 21746 df-perf 21747 df-cn 21837 df-cnp 21838 df-haus 21925 df-cmp 21997 df-tx 22172 df-hmeo 22365 df-fil 22456 df-fm 22548 df-flim 22549 df-flf 22550 df-xms 22932 df-ms 22933 df-tms 22934 df-cncf 23488 df-limc 24466 df-dv 24467

This theorem is referenced by: dvgt0 24603 dvlt0 24604 dvge0 24605

W3C validator