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Theorem dvferm2lem 25934

Description: Lemma for dvferm 25936. (Contributed by Mario Carneiro, 24-Feb-2015.)

**Hypotheses**
Ref	Expression
dvferm.a	⊢ (𝜑 → 𝐹:𝑋⟶ℝ)
dvferm.b	⊢ (𝜑 → 𝑋 ⊆ ℝ)
dvferm.u	⊢ (𝜑 → 𝑈 ∈ (𝐴(,)𝐵))
dvferm.s	⊢ (𝜑 → (𝐴(,)𝐵) ⊆ 𝑋)
dvferm.d	⊢ (𝜑 → 𝑈 ∈ dom (ℝ D 𝐹))
dvferm2.r	⊢ (𝜑 → ∀𝑦 ∈ (𝐴(,)𝑈)(𝐹‘𝑦) ≤ (𝐹‘𝑈))
dvferm2.z	⊢ (𝜑 → ((ℝ D 𝐹)‘𝑈) < 0)
dvferm2.t	⊢ (𝜑 → 𝑇 ∈ ℝ⁺)
dvferm2.l	⊢ (𝜑 → ∀𝑧 ∈ (𝑋 ∖ {𝑈})((𝑧 ≠ 𝑈 ∧ (abs‘(𝑧 − 𝑈)) < 𝑇) → (abs‘((((𝐹‘𝑧) − (𝐹‘𝑈)) / (𝑧 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) < -((ℝ D 𝐹)‘𝑈)))
dvferm2.x	⊢ 𝑆 = ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) / 2)

**Assertion**
Ref	Expression
dvferm2lem	⊢ ¬ 𝜑

Distinct variable groups: 𝑦,𝑧,𝐴 𝑦,𝐵,𝑧 𝑦,𝐹,𝑧 𝑦,𝑈,𝑧 𝑦,𝑋,𝑧 𝜑,𝑦 𝑦,𝑆,𝑧 𝑧,𝑇 Allowed substitution hints: 𝜑(𝑧) 𝑇(𝑦)

**Proof of Theorem dvferm2lem**
Step	Hyp	Ref	Expression
1		dvferm2.x	. . . . . . . . . . . 12 ⊢ 𝑆 = ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) / 2)
2		mnfxr 11299	. . . . . . . . . . . . . . . 16 ⊢ -∞ ∈ ℝ^*
3	2	a1i 11	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → -∞ ∈ ℝ^*)
4		ioossre 13415	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴(,)𝐵) ⊆ ℝ
5		dvferm.u	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝜑 → 𝑈 ∈ (𝐴(,)𝐵))
6	4, 5	sselid 3970	. . . . . . . . . . . . . . . . . 18 ⊢ (𝜑 → 𝑈 ∈ ℝ)
7		dvferm2.t	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝜑 → 𝑇 ∈ ℝ⁺)
8	7	rpred 13046	. . . . . . . . . . . . . . . . . 18 ⊢ (𝜑 → 𝑇 ∈ ℝ)
9	6, 8	resubcld 11670	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → (𝑈 − 𝑇) ∈ ℝ)
10	9	rexrd 11292	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑈 − 𝑇) ∈ ℝ^*)
11		ne0i 4330	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑈 ∈ (𝐴(,)𝐵) → (𝐴(,)𝐵) ≠ ∅)
12		ndmioo 13381	. . . . . . . . . . . . . . . . . . 19 ⊢ (¬ (𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (𝐴(,)𝐵) = ∅)
13	12	necon1ai 2958	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐴(,)𝐵) ≠ ∅ → (𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*))
14	5, 11, 13	3syl 18	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → (𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*))
15	14	simpld 493	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
16	10, 15	ifcld 4570	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) ∈ ℝ^*)
17	6	rexrd 11292	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑈 ∈ ℝ^*)
18	9	mnfltd 13134	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → -∞ < (𝑈 − 𝑇))
19		xrmax2 13185	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐴 ∈ ℝ^* ∧ (𝑈 − 𝑇) ∈ ℝ^*) → (𝑈 − 𝑇) ≤ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴))
20	15, 10, 19	syl2anc 582	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑈 − 𝑇) ≤ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴))
21	3, 10, 16, 18, 20	xrltletrd 13170	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → -∞ < if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴))
22	6, 7	ltsubrpd 13078	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → (𝑈 − 𝑇) < 𝑈)
23		eliooord 13413	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑈 ∈ (𝐴(,)𝐵) → (𝐴 < 𝑈 ∧ 𝑈 < 𝐵))
24	5, 23	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → (𝐴 < 𝑈 ∧ 𝑈 < 𝐵))
25	24	simpld 493	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝐴 < 𝑈)
26		breq1 5146	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑈 − 𝑇) = if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) → ((𝑈 − 𝑇) < 𝑈 ↔ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑈))
27		breq1 5146	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 = if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) → (𝐴 < 𝑈 ↔ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑈))
28	26, 27	ifboth 4563	. . . . . . . . . . . . . . . 16 ⊢ (((𝑈 − 𝑇) < 𝑈 ∧ 𝐴 < 𝑈) → if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑈)
29	22, 25, 28	syl2anc 582	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑈)
30		xrre2 13179	. . . . . . . . . . . . . . 15 ⊢ (((-∞ ∈ ℝ^* ∧ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) ∈ ℝ^* ∧ 𝑈 ∈ ℝ^*) ∧ (-∞ < if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) ∧ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑈)) → if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) ∈ ℝ)
31	3, 16, 17, 21, 29, 30	syl32anc 1375	. . . . . . . . . . . . . 14 ⊢ (𝜑 → if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) ∈ ℝ)
32	31, 6	readdcld 11271	. . . . . . . . . . . . 13 ⊢ (𝜑 → (if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) ∈ ℝ)
33	32	rehalfcld 12487	. . . . . . . . . . . 12 ⊢ (𝜑 → ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) / 2) ∈ ℝ)
34	1, 33	eqeltrid 2829	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑆 ∈ ℝ)
35		avglt2 12479	. . . . . . . . . . . . . 14 ⊢ ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) ∈ ℝ ∧ 𝑈 ∈ ℝ) → (if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑈 ↔ ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) / 2) < 𝑈))
36	31, 6, 35	syl2anc 582	. . . . . . . . . . . . 13 ⊢ (𝜑 → (if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑈 ↔ ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) / 2) < 𝑈))
37	29, 36	mpbid 231	. . . . . . . . . . . 12 ⊢ (𝜑 → ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) / 2) < 𝑈)
38	1, 37	eqbrtrid 5178	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑆 < 𝑈)
39	34, 38	ltned 11378	. . . . . . . . . 10 ⊢ (𝜑 → 𝑆 ≠ 𝑈)
40	34, 6, 38	ltled 11390	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑆 ≤ 𝑈)
41	34, 6, 40	abssuble0d 15409	. . . . . . . . . . 11 ⊢ (𝜑 → (abs‘(𝑆 − 𝑈)) = (𝑈 − 𝑆))
42		avglt1 12478	. . . . . . . . . . . . . . . 16 ⊢ ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) ∈ ℝ ∧ 𝑈 ∈ ℝ) → (if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑈 ↔ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) / 2)))
43	31, 6, 42	syl2anc 582	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑈 ↔ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) / 2)))
44	29, 43	mpbid 231	. . . . . . . . . . . . . 14 ⊢ (𝜑 → if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < ((if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) + 𝑈) / 2))
45	44, 1	breqtrrdi 5185	. . . . . . . . . . . . 13 ⊢ (𝜑 → if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴) < 𝑆)
46	9, 31, 34, 20, 45	lelttrd 11400	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑈 − 𝑇) < 𝑆)
47	6, 8, 34, 46	ltsub23d 11847	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑈 − 𝑆) < 𝑇)
48	41, 47	eqbrtrd 5165	. . . . . . . . . 10 ⊢ (𝜑 → (abs‘(𝑆 − 𝑈)) < 𝑇)
49		neeq1 2993	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑆 → (𝑧 ≠ 𝑈 ↔ 𝑆 ≠ 𝑈))
50		fvoveq1 7438	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑆 → (abs‘(𝑧 − 𝑈)) = (abs‘(𝑆 − 𝑈)))
51	50	breq1d 5153	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑆 → ((abs‘(𝑧 − 𝑈)) < 𝑇 ↔ (abs‘(𝑆 − 𝑈)) < 𝑇))
52	49, 51	anbi12d 630	. . . . . . . . . . . 12 ⊢ (𝑧 = 𝑆 → ((𝑧 ≠ 𝑈 ∧ (abs‘(𝑧 − 𝑈)) < 𝑇) ↔ (𝑆 ≠ 𝑈 ∧ (abs‘(𝑆 − 𝑈)) < 𝑇)))
53		fveq2 6891	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = 𝑆 → (𝐹‘𝑧) = (𝐹‘𝑆))
54	53	oveq1d 7430	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = 𝑆 → ((𝐹‘𝑧) − (𝐹‘𝑈)) = ((𝐹‘𝑆) − (𝐹‘𝑈)))
55		oveq1 7422	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = 𝑆 → (𝑧 − 𝑈) = (𝑆 − 𝑈))
56	54, 55	oveq12d 7433	. . . . . . . . . . . . . 14 ⊢ (𝑧 = 𝑆 → (((𝐹‘𝑧) − (𝐹‘𝑈)) / (𝑧 − 𝑈)) = (((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)))
57	56	fvoveq1d 7437	. . . . . . . . . . . . 13 ⊢ (𝑧 = 𝑆 → (abs‘((((𝐹‘𝑧) − (𝐹‘𝑈)) / (𝑧 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) = (abs‘((((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))))
58	57	breq1d 5153	. . . . . . . . . . . 12 ⊢ (𝑧 = 𝑆 → ((abs‘((((𝐹‘𝑧) − (𝐹‘𝑈)) / (𝑧 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) < -((ℝ D 𝐹)‘𝑈) ↔ (abs‘((((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) < -((ℝ D 𝐹)‘𝑈)))
59	52, 58	imbi12d 343	. . . . . . . . . . 11 ⊢ (𝑧 = 𝑆 → (((𝑧 ≠ 𝑈 ∧ (abs‘(𝑧 − 𝑈)) < 𝑇) → (abs‘((((𝐹‘𝑧) − (𝐹‘𝑈)) / (𝑧 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) < -((ℝ D 𝐹)‘𝑈)) ↔ ((𝑆 ≠ 𝑈 ∧ (abs‘(𝑆 − 𝑈)) < 𝑇) → (abs‘((((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) < -((ℝ D 𝐹)‘𝑈))))
60		dvferm2.l	. . . . . . . . . . 11 ⊢ (𝜑 → ∀𝑧 ∈ (𝑋 ∖ {𝑈})((𝑧 ≠ 𝑈 ∧ (abs‘(𝑧 − 𝑈)) < 𝑇) → (abs‘((((𝐹‘𝑧) − (𝐹‘𝑈)) / (𝑧 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) < -((ℝ D 𝐹)‘𝑈)))
61	14	simprd 494	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
62	24	simprd 494	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑈 < 𝐵)
63	17, 61, 62	xrltled 13159	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑈 ≤ 𝐵)
64		iooss2 13390	. . . . . . . . . . . . . . 15 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝑈 ≤ 𝐵) → (𝐴(,)𝑈) ⊆ (𝐴(,)𝐵))
65	61, 63, 64	syl2anc 582	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝐴(,)𝑈) ⊆ (𝐴(,)𝐵))
66		dvferm.s	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝐴(,)𝐵) ⊆ 𝑋)
67	65, 66	sstrd 3983	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝐴(,)𝑈) ⊆ 𝑋)
68	34	rexrd 11292	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑆 ∈ ℝ^*)
69		xrmax1 13184	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ∈ ℝ^* ∧ (𝑈 − 𝑇) ∈ ℝ^*) → 𝐴 ≤ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴))
70	15, 10, 69	syl2anc 582	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝐴 ≤ if(𝐴 ≤ (𝑈 − 𝑇), (𝑈 − 𝑇), 𝐴))
71	15, 16, 68, 70, 45	xrlelttrd 13169	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝐴 < 𝑆)
72		elioo2 13395	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝑈 ∈ ℝ^*) → (𝑆 ∈ (𝐴(,)𝑈) ↔ (𝑆 ∈ ℝ ∧ 𝐴 < 𝑆 ∧ 𝑆 < 𝑈)))
73	15, 17, 72	syl2anc 582	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑆 ∈ (𝐴(,)𝑈) ↔ (𝑆 ∈ ℝ ∧ 𝐴 < 𝑆 ∧ 𝑆 < 𝑈)))
74	34, 71, 38, 73	mpbir3and 1339	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑆 ∈ (𝐴(,)𝑈))
75	67, 74	sseldd 3973	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑆 ∈ 𝑋)
76		eldifsn 4786	. . . . . . . . . . . 12 ⊢ (𝑆 ∈ (𝑋 ∖ {𝑈}) ↔ (𝑆 ∈ 𝑋 ∧ 𝑆 ≠ 𝑈))
77	75, 39, 76	sylanbrc 581	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑆 ∈ (𝑋 ∖ {𝑈}))
78	59, 60, 77	rspcdva 3603	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑆 ≠ 𝑈 ∧ (abs‘(𝑆 − 𝑈)) < 𝑇) → (abs‘((((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) < -((ℝ D 𝐹)‘𝑈)))
79	39, 48, 78	mp2and 697	. . . . . . . . 9 ⊢ (𝜑 → (abs‘((((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) < -((ℝ D 𝐹)‘𝑈))
80		dvferm.a	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐹:𝑋⟶ℝ)
81	80, 75	ffvelcdmd 7089	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐹‘𝑆) ∈ ℝ)
82	66, 5	sseldd 3973	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑈 ∈ 𝑋)
83	80, 82	ffvelcdmd 7089	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐹‘𝑈) ∈ ℝ)
84	81, 83	resubcld 11670	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝐹‘𝑆) − (𝐹‘𝑈)) ∈ ℝ)
85	34, 6	resubcld 11670	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑆 − 𝑈) ∈ ℝ)
86	34	recnd 11270	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑆 ∈ ℂ)
87	6	recnd 11270	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑈 ∈ ℂ)
88	86, 87, 39	subne0d 11608	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑆 − 𝑈) ≠ 0)
89	84, 85, 88	redivcld 12070	. . . . . . . . . 10 ⊢ (𝜑 → (((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) ∈ ℝ)
90		dvferm.b	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑋 ⊆ ℝ)
91		dvfre 25899	. . . . . . . . . . . 12 ⊢ ((𝐹:𝑋⟶ℝ ∧ 𝑋 ⊆ ℝ) → (ℝ D 𝐹):dom (ℝ D 𝐹)⟶ℝ)
92	80, 90, 91	syl2anc 582	. . . . . . . . . . 11 ⊢ (𝜑 → (ℝ D 𝐹):dom (ℝ D 𝐹)⟶ℝ)
93		dvferm.d	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑈 ∈ dom (ℝ D 𝐹))
94	92, 93	ffvelcdmd 7089	. . . . . . . . . 10 ⊢ (𝜑 → ((ℝ D 𝐹)‘𝑈) ∈ ℝ)
95	94	renegcld 11669	. . . . . . . . . 10 ⊢ (𝜑 → -((ℝ D 𝐹)‘𝑈) ∈ ℝ)
96	89, 94, 95	absdifltd 15410	. . . . . . . . 9 ⊢ (𝜑 → ((abs‘((((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) − ((ℝ D 𝐹)‘𝑈))) < -((ℝ D 𝐹)‘𝑈) ↔ ((((ℝ D 𝐹)‘𝑈) − -((ℝ D 𝐹)‘𝑈)) < (((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) ∧ (((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) < (((ℝ D 𝐹)‘𝑈) + -((ℝ D 𝐹)‘𝑈)))))
97	79, 96	mpbid 231	. . . . . . . 8 ⊢ (𝜑 → ((((ℝ D 𝐹)‘𝑈) − -((ℝ D 𝐹)‘𝑈)) < (((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) ∧ (((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) < (((ℝ D 𝐹)‘𝑈) + -((ℝ D 𝐹)‘𝑈))))
98	97	simprd 494	. . . . . . 7 ⊢ (𝜑 → (((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) < (((ℝ D 𝐹)‘𝑈) + -((ℝ D 𝐹)‘𝑈)))
99	94	recnd 11270	. . . . . . . 8 ⊢ (𝜑 → ((ℝ D 𝐹)‘𝑈) ∈ ℂ)
100	99	negidd 11589	. . . . . . 7 ⊢ (𝜑 → (((ℝ D 𝐹)‘𝑈) + -((ℝ D 𝐹)‘𝑈)) = 0)
101	98, 100	breqtrd 5169	. . . . . 6 ⊢ (𝜑 → (((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) < 0)
102	89	lt0neg1d 11811	. . . . . 6 ⊢ (𝜑 → ((((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) < 0 ↔ 0 < -(((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈))))
103	101, 102	mpbid 231	. . . . 5 ⊢ (𝜑 → 0 < -(((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)))
104	84	recnd 11270	. . . . . 6 ⊢ (𝜑 → ((𝐹‘𝑆) − (𝐹‘𝑈)) ∈ ℂ)
105	85	recnd 11270	. . . . . 6 ⊢ (𝜑 → (𝑆 − 𝑈) ∈ ℂ)
106	104, 105, 88	divneg2d 12032	. . . . 5 ⊢ (𝜑 → -(((𝐹‘𝑆) − (𝐹‘𝑈)) / (𝑆 − 𝑈)) = (((𝐹‘𝑆) − (𝐹‘𝑈)) / -(𝑆 − 𝑈)))
107	103, 106	breqtrd 5169	. . . 4 ⊢ (𝜑 → 0 < (((𝐹‘𝑆) − (𝐹‘𝑈)) / -(𝑆 − 𝑈)))
108	85	renegcld 11669	. . . . 5 ⊢ (𝜑 → -(𝑆 − 𝑈) ∈ ℝ)
109	34, 6	posdifd 11829	. . . . . . 7 ⊢ (𝜑 → (𝑆 < 𝑈 ↔ 0 < (𝑈 − 𝑆)))
110	38, 109	mpbid 231	. . . . . 6 ⊢ (𝜑 → 0 < (𝑈 − 𝑆))
111	86, 87	negsubdi2d 11615	. . . . . 6 ⊢ (𝜑 → -(𝑆 − 𝑈) = (𝑈 − 𝑆))
112	110, 111	breqtrrd 5171	. . . . 5 ⊢ (𝜑 → 0 < -(𝑆 − 𝑈))
113		gt0div 12108	. . . . 5 ⊢ ((((𝐹‘𝑆) − (𝐹‘𝑈)) ∈ ℝ ∧ -(𝑆 − 𝑈) ∈ ℝ ∧ 0 < -(𝑆 − 𝑈)) → (0 < ((𝐹‘𝑆) − (𝐹‘𝑈)) ↔ 0 < (((𝐹‘𝑆) − (𝐹‘𝑈)) / -(𝑆 − 𝑈))))
114	84, 108, 112, 113	syl3anc 1368	. . . 4 ⊢ (𝜑 → (0 < ((𝐹‘𝑆) − (𝐹‘𝑈)) ↔ 0 < (((𝐹‘𝑆) − (𝐹‘𝑈)) / -(𝑆 − 𝑈))))
115	107, 114	mpbird 256	. . 3 ⊢ (𝜑 → 0 < ((𝐹‘𝑆) − (𝐹‘𝑈)))
116	83, 81	posdifd 11829	. . 3 ⊢ (𝜑 → ((𝐹‘𝑈) < (𝐹‘𝑆) ↔ 0 < ((𝐹‘𝑆) − (𝐹‘𝑈))))
117	115, 116	mpbird 256	. 2 ⊢ (𝜑 → (𝐹‘𝑈) < (𝐹‘𝑆))
118		fveq2 6891	. . . . 5 ⊢ (𝑦 = 𝑆 → (𝐹‘𝑦) = (𝐹‘𝑆))
119	118	breq1d 5153	. . . 4 ⊢ (𝑦 = 𝑆 → ((𝐹‘𝑦) ≤ (𝐹‘𝑈) ↔ (𝐹‘𝑆) ≤ (𝐹‘𝑈)))
120		dvferm2.r	. . . 4 ⊢ (𝜑 → ∀𝑦 ∈ (𝐴(,)𝑈)(𝐹‘𝑦) ≤ (𝐹‘𝑈))
121	119, 120, 74	rspcdva 3603	. . 3 ⊢ (𝜑 → (𝐹‘𝑆) ≤ (𝐹‘𝑈))
122	81, 83, 121	lensymd 11393	. 2 ⊢ (𝜑 → ¬ (𝐹‘𝑈) < (𝐹‘𝑆))
123	117, 122	pm2.65i 193	1 ⊢ ¬ 𝜑

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2930 ∀wral 3051 ∖ cdif 3937 ⊆ wss 3940 ∅c0 4318 ifcif 4524 {csn 4624 class class class wbr 5143 dom cdm 5672 ⟶wf 6538 ‘cfv 6542 (class class class)co 7415 ℝcr 11135 0cc0 11136 + caddc 11139 -∞cmnf 11274 ℝ^*cxr 11275 < clt 11276 ≤ cle 11277 − cmin 11472 -cneg 11473 / cdiv 11899 2c2 12295 ℝ⁺crp 13004 (,)cioo 13354 abscabs 15211 D cdv 25808

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5280 ax-sep 5294 ax-nul 5301 ax-pow 5359 ax-pr 5423 ax-un 7737 ax-cnex 11192 ax-resscn 11193 ax-1cn 11194 ax-icn 11195 ax-addcl 11196 ax-addrcl 11197 ax-mulcl 11198 ax-mulrcl 11199 ax-mulcom 11200 ax-addass 11201 ax-mulass 11202 ax-distr 11203 ax-i2m1 11204 ax-1ne0 11205 ax-1rid 11206 ax-rnegex 11207 ax-rrecex 11208 ax-cnre 11209 ax-pre-lttri 11210 ax-pre-lttrn 11211 ax-pre-ltadd 11212 ax-pre-mulgt0 11213 ax-pre-sup 11214

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3770 df-csb 3886 df-dif 3943 df-un 3945 df-in 3947 df-ss 3957 df-pss 3960 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-tp 4629 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-iin 4994 df-br 5144 df-opab 5206 df-mpt 5227 df-tr 5261 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7371 df-ov 7418 df-oprab 7419 df-mpo 7420 df-om 7868 df-1st 7989 df-2nd 7990 df-frecs 8283 df-wrecs 8314 df-recs 8388 df-rdg 8427 df-1o 8483 df-er 8721 df-map 8843 df-pm 8844 df-en 8961 df-dom 8962 df-sdom 8963 df-fin 8964 df-fi 9432 df-sup 9463 df-inf 9464 df-pnf 11278 df-mnf 11279 df-xr 11280 df-ltxr 11281 df-le 11282 df-sub 11474 df-neg 11475 df-div 11900 df-nn 12241 df-2 12303 df-3 12304 df-4 12305 df-5 12306 df-6 12307 df-7 12308 df-8 12309 df-9 12310 df-n0 12501 df-z 12587 df-dec 12706 df-uz 12851 df-q 12961 df-rp 13005 df-xneg 13122 df-xadd 13123 df-xmul 13124 df-ioo 13358 df-icc 13361 df-fz 13515 df-seq 13997 df-exp 14057 df-cj 15076 df-re 15077 df-im 15078 df-sqrt 15212 df-abs 15213 df-struct 17113 df-slot 17148 df-ndx 17160 df-base 17178 df-plusg 17243 df-mulr 17244 df-starv 17245 df-tset 17249 df-ple 17250 df-ds 17252 df-unif 17253 df-rest 17401 df-topn 17402 df-topgen 17422 df-psmet 21273 df-xmet 21274 df-met 21275 df-bl 21276 df-mopn 21277 df-fbas 21278 df-fg 21279 df-cnfld 21282 df-top 22812 df-topon 22829 df-topsp 22851 df-bases 22865 df-cld 22939 df-ntr 22940 df-cls 22941 df-nei 23018 df-lp 23056 df-perf 23057 df-cn 23147 df-cnp 23148 df-haus 23235 df-fil 23766 df-fm 23858 df-flim 23859 df-flf 23860 df-xms 24242 df-ms 24243 df-cncf 24814 df-limc 25811 df-dv 25812

This theorem is referenced by: dvferm2 25935

W3C validator