ivthreinc - Intuitionistic Logic Explorer

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Theorem ivthreinc 14965

Description: Restating the intermediate value theorem. Given a hypothesis stating the intermediate value theorem (in a strong form which is not provable given our axioms alone), provide a conclusion similar to the theorem as stated in the Metamath Proof Explorer (which is also similar to how we state the theorem for a strictly monotonic function at ivthinc 14963). Being able to have a hypothesis stating the intermediate value theorem will be helpful when it comes time to show that it implies a constructive taboo. This version of the theorem requires that the function 𝐹 is continuous on the entire real line, not just (𝐴[,]𝐵) which may be an unnecessary condition but which is sufficient for the way we want to use it. (Contributed by Jim Kingdon, 7-Jul-2025.)

**Hypotheses**
Ref	Expression
ivthreinc.1	⊢ (𝜑 → 𝐴 ∈ ℝ)
ivthreinc.2	⊢ (𝜑 → 𝐵 ∈ ℝ)
ivthreinc.3	⊢ (𝜑 → 𝑈 ∈ ℝ)
ivthreinc.4	⊢ (𝜑 → 𝐴 < 𝐵)
ivthreinc.7	⊢ (𝜑 → 𝐹 ∈ (ℝ–cn→ℝ))
ivthreinc.9	⊢ (𝜑 → ((𝐹‘𝐴) < 𝑈 ∧ 𝑈 < (𝐹‘𝐵)))
ivthreinc.i	⊢ (𝜑 → ∀𝑓(𝑓 ∈ (ℝ–cn→ℝ) → ∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ (𝑓‘𝑎) < 0 ∧ 0 < (𝑓‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ (𝑓‘𝑥) = 0))))

**Assertion**
Ref	Expression
ivthreinc	⊢ (𝜑 → ∃𝑐 ∈ (𝐴(,)𝐵)(𝐹‘𝑐) = 𝑈)

Distinct variable groups: 𝐴,𝑎,𝑏,𝑥 𝐴,𝑐,𝑥 𝐵,𝑏,𝑥 𝐵,𝑐 𝐹,𝑎,𝑏,𝑓,𝑥 𝐹,𝑐 𝑈,𝑎,𝑏,𝑓,𝑥 𝑈,𝑐 𝜑,𝑥 Allowed substitution hints: 𝜑(𝑓,𝑎,𝑏,𝑐) 𝐴(𝑓) 𝐵(𝑓,𝑎)

Proof of Theorem ivthreinc Dummy variable 𝑟 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ivthreinc.4	. . . 4 ⊢ (𝜑 → 𝐴 < 𝐵)
2		eqid 2196	. . . . . 6 ⊢ (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))
3		fveq2 5561	. . . . . . 7 ⊢ (𝑟 = 𝐴 → (𝐹‘𝑟) = (𝐹‘𝐴))
4	3	oveq1d 5940	. . . . . 6 ⊢ (𝑟 = 𝐴 → ((𝐹‘𝑟) − 𝑈) = ((𝐹‘𝐴) − 𝑈))
5		ivthreinc.1	. . . . . 6 ⊢ (𝜑 → 𝐴 ∈ ℝ)
6		ivthreinc.7	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 ∈ (ℝ–cn→ℝ))
7		cncff 14897	. . . . . . . . 9 ⊢ (𝐹 ∈ (ℝ–cn→ℝ) → 𝐹:ℝ⟶ℝ)
8	6, 7	syl 14	. . . . . . . 8 ⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
9	8, 5	ffvelcdmd 5701	. . . . . . 7 ⊢ (𝜑 → (𝐹‘𝐴) ∈ ℝ)
10		ivthreinc.3	. . . . . . 7 ⊢ (𝜑 → 𝑈 ∈ ℝ)
11	9, 10	resubcld 8424	. . . . . 6 ⊢ (𝜑 → ((𝐹‘𝐴) − 𝑈) ∈ ℝ)
12	2, 4, 5, 11	fvmptd3 5658	. . . . 5 ⊢ (𝜑 → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) = ((𝐹‘𝐴) − 𝑈))
13		ivthreinc.9	. . . . . . 7 ⊢ (𝜑 → ((𝐹‘𝐴) < 𝑈 ∧ 𝑈 < (𝐹‘𝐵)))
14	13	simpld 112	. . . . . 6 ⊢ (𝜑 → (𝐹‘𝐴) < 𝑈)
15	9, 10	sublt0d 8614	. . . . . 6 ⊢ (𝜑 → (((𝐹‘𝐴) − 𝑈) < 0 ↔ (𝐹‘𝐴) < 𝑈))
16	14, 15	mpbird 167	. . . . 5 ⊢ (𝜑 → ((𝐹‘𝐴) − 𝑈) < 0)
17	12, 16	eqbrtrd 4056	. . . 4 ⊢ (𝜑 → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0)
18	13	simprd 114	. . . . . 6 ⊢ (𝜑 → 𝑈 < (𝐹‘𝐵))
19		ivthreinc.2	. . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℝ)
20	8, 19	ffvelcdmd 5701	. . . . . . 7 ⊢ (𝜑 → (𝐹‘𝐵) ∈ ℝ)
21	10, 20	posdifd 8576	. . . . . 6 ⊢ (𝜑 → (𝑈 < (𝐹‘𝐵) ↔ 0 < ((𝐹‘𝐵) − 𝑈)))
22	18, 21	mpbid 147	. . . . 5 ⊢ (𝜑 → 0 < ((𝐹‘𝐵) − 𝑈))
23		fveq2 5561	. . . . . . 7 ⊢ (𝑟 = 𝐵 → (𝐹‘𝑟) = (𝐹‘𝐵))
24	23	oveq1d 5940	. . . . . 6 ⊢ (𝑟 = 𝐵 → ((𝐹‘𝑟) − 𝑈) = ((𝐹‘𝐵) − 𝑈))
25	20, 10	resubcld 8424	. . . . . 6 ⊢ (𝜑 → ((𝐹‘𝐵) − 𝑈) ∈ ℝ)
26	2, 24, 19, 25	fvmptd3 5658	. . . . 5 ⊢ (𝜑 → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐵) = ((𝐹‘𝐵) − 𝑈))
27	22, 26	breqtrrd 4062	. . . 4 ⊢ (𝜑 → 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐵))
28	1, 17, 27	3jca 1179	. . 3 ⊢ (𝜑 → (𝐴 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐵)))
29		breq2 4038	. . . . . 6 ⊢ (𝑏 = 𝐵 → (𝐴 < 𝑏 ↔ 𝐴 < 𝐵))
30		fveq2 5561	. . . . . . 7 ⊢ (𝑏 = 𝐵 → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏) = ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐵))
31	30	breq2d 4046	. . . . . 6 ⊢ (𝑏 = 𝐵 → (0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏) ↔ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐵)))
32	29, 31	3anbi13d 1325	. . . . 5 ⊢ (𝑏 = 𝐵 → ((𝐴 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) ↔ (𝐴 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐵))))
33		breq2 4038	. . . . . . 7 ⊢ (𝑏 = 𝐵 → (𝑥 < 𝑏 ↔ 𝑥 < 𝐵))
34	33	3anbi2d 1328	. . . . . 6 ⊢ (𝑏 = 𝐵 → ((𝐴 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0) ↔ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))
35	34	rexbidv 2498	. . . . 5 ⊢ (𝑏 = 𝐵 → (∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0) ↔ ∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))
36	32, 35	imbi12d 234	. . . 4 ⊢ (𝑏 = 𝐵 → (((𝐴 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)) ↔ ((𝐴 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐵)) → ∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))))
37		breq1 4037	. . . . . . . 8 ⊢ (𝑎 = 𝐴 → (𝑎 < 𝑏 ↔ 𝐴 < 𝑏))
38		fveq2 5561	. . . . . . . . 9 ⊢ (𝑎 = 𝐴 → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) = ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴))
39	38	breq1d 4044	. . . . . . . 8 ⊢ (𝑎 = 𝐴 → (((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ↔ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0))
40	37, 39	3anbi12d 1324	. . . . . . 7 ⊢ (𝑎 = 𝐴 → ((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) ↔ (𝐴 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏))))
41		breq1 4037	. . . . . . . . 9 ⊢ (𝑎 = 𝐴 → (𝑎 < 𝑥 ↔ 𝐴 < 𝑥))
42	41	3anbi1d 1327	. . . . . . . 8 ⊢ (𝑎 = 𝐴 → ((𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0) ↔ (𝐴 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))
43	42	rexbidv 2498	. . . . . . 7 ⊢ (𝑎 = 𝐴 → (∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0) ↔ ∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))
44	40, 43	imbi12d 234	. . . . . 6 ⊢ (𝑎 = 𝐴 → (((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)) ↔ ((𝐴 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))))
45	44	ralbidv 2497	. . . . 5 ⊢ (𝑎 = 𝐴 → (∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)) ↔ ∀𝑏 ∈ ℝ ((𝐴 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))))
46	8	ffvelcdmda 5700	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑟 ∈ ℝ) → (𝐹‘𝑟) ∈ ℝ)
47	10	adantr 276	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑟 ∈ ℝ) → 𝑈 ∈ ℝ)
48	46, 47	resubcld 8424	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑟 ∈ ℝ) → ((𝐹‘𝑟) − 𝑈) ∈ ℝ)
49	48	fmpttd 5720	. . . . . . 7 ⊢ (𝜑 → (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)):ℝ⟶ℝ)
50		ax-resscn 7988	. . . . . . . . 9 ⊢ ℝ ⊆ ℂ
51	50	a1i 9	. . . . . . . 8 ⊢ (𝜑 → ℝ ⊆ ℂ)
52	8	feqmptd 5617	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹 = (𝑟 ∈ ℝ ↦ (𝐹‘𝑟)))
53		ssid 3204	. . . . . . . . . . . 12 ⊢ ℂ ⊆ ℂ
54		cncfss 14903	. . . . . . . . . . . 12 ⊢ ((ℝ ⊆ ℂ ∧ ℂ ⊆ ℂ) → (ℝ–cn→ℝ) ⊆ (ℝ–cn→ℂ))
55	50, 53, 54	mp2an 426	. . . . . . . . . . 11 ⊢ (ℝ–cn→ℝ) ⊆ (ℝ–cn→ℂ)
56	55, 6	sselid 3182	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹 ∈ (ℝ–cn→ℂ))
57	52, 56	eqeltrrd 2274	. . . . . . . . 9 ⊢ (𝜑 → (𝑟 ∈ ℝ ↦ (𝐹‘𝑟)) ∈ (ℝ–cn→ℂ))
58	10	recnd 8072	. . . . . . . . . 10 ⊢ (𝜑 → 𝑈 ∈ ℂ)
59	53	a1i 9	. . . . . . . . . 10 ⊢ (𝜑 → ℂ ⊆ ℂ)
60		cncfmptc 14916	. . . . . . . . . 10 ⊢ ((𝑈 ∈ ℂ ∧ ℝ ⊆ ℂ ∧ ℂ ⊆ ℂ) → (𝑟 ∈ ℝ ↦ 𝑈) ∈ (ℝ–cn→ℂ))
61	58, 51, 59, 60	syl3anc 1249	. . . . . . . . 9 ⊢ (𝜑 → (𝑟 ∈ ℝ ↦ 𝑈) ∈ (ℝ–cn→ℂ))
62	57, 61	subcncf 14933	. . . . . . . 8 ⊢ (𝜑 → (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ (ℝ–cn→ℂ))
63		cncfcdm 14902	. . . . . . . 8 ⊢ ((ℝ ⊆ ℂ ∧ (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ (ℝ–cn→ℂ)) → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ (ℝ–cn→ℝ) ↔ (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)):ℝ⟶ℝ))
64	51, 62, 63	syl2anc 411	. . . . . . 7 ⊢ (𝜑 → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ (ℝ–cn→ℝ) ↔ (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)):ℝ⟶ℝ))
65	49, 64	mpbird 167	. . . . . 6 ⊢ (𝜑 → (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ (ℝ–cn→ℝ))
66		ivthreinc.i	. . . . . . 7 ⊢ (𝜑 → ∀𝑓(𝑓 ∈ (ℝ–cn→ℝ) → ∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ (𝑓‘𝑎) < 0 ∧ 0 < (𝑓‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ (𝑓‘𝑥) = 0))))
67		reex 8030	. . . . . . . . 9 ⊢ ℝ ∈ V
68	67	mptex 5791	. . . . . . . 8 ⊢ (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ V
69		eleq1 2259	. . . . . . . . 9 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → (𝑓 ∈ (ℝ–cn→ℝ) ↔ (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ (ℝ–cn→ℝ)))
70		fveq1 5560	. . . . . . . . . . . . . 14 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → (𝑓‘𝑎) = ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎))
71	70	breq1d 4044	. . . . . . . . . . . . 13 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → ((𝑓‘𝑎) < 0 ↔ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0))
72		fveq1 5560	. . . . . . . . . . . . . 14 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → (𝑓‘𝑏) = ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏))
73	72	breq2d 4046	. . . . . . . . . . . . 13 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → (0 < (𝑓‘𝑏) ↔ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)))
74	71, 73	3anbi23d 1326	. . . . . . . . . . . 12 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → ((𝑎 < 𝑏 ∧ (𝑓‘𝑎) < 0 ∧ 0 < (𝑓‘𝑏)) ↔ (𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏))))
75		fveq1 5560	. . . . . . . . . . . . . . 15 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → (𝑓‘𝑥) = ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥))
76	75	eqeq1d 2205	. . . . . . . . . . . . . 14 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → ((𝑓‘𝑥) = 0 ↔ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))
77	76	3anbi3d 1329	. . . . . . . . . . . . 13 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → ((𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ (𝑓‘𝑥) = 0) ↔ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))
78	77	rexbidv 2498	. . . . . . . . . . . 12 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → (∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ (𝑓‘𝑥) = 0) ↔ ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))
79	74, 78	imbi12d 234	. . . . . . . . . . 11 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → (((𝑎 < 𝑏 ∧ (𝑓‘𝑎) < 0 ∧ 0 < (𝑓‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ (𝑓‘𝑥) = 0)) ↔ ((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))))
80	79	ralbidv 2497	. . . . . . . . . 10 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → (∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ (𝑓‘𝑎) < 0 ∧ 0 < (𝑓‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ (𝑓‘𝑥) = 0)) ↔ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))))
81	80	ralbidv 2497	. . . . . . . . 9 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → (∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ (𝑓‘𝑎) < 0 ∧ 0 < (𝑓‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ (𝑓‘𝑥) = 0)) ↔ ∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))))
82	69, 81	imbi12d 234	. . . . . . . 8 ⊢ (𝑓 = (𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) → ((𝑓 ∈ (ℝ–cn→ℝ) → ∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ (𝑓‘𝑎) < 0 ∧ 0 < (𝑓‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ (𝑓‘𝑥) = 0))) ↔ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ (ℝ–cn→ℝ) → ∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))))
83	68, 82	spcv 2858	. . . . . . 7 ⊢ (∀𝑓(𝑓 ∈ (ℝ–cn→ℝ) → ∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ (𝑓‘𝑎) < 0 ∧ 0 < (𝑓‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ (𝑓‘𝑥) = 0))) → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ (ℝ–cn→ℝ) → ∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))))
84	66, 83	syl 14	. . . . . 6 ⊢ (𝜑 → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈)) ∈ (ℝ–cn→ℝ) → ∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))))
85	65, 84	mpd 13	. . . . 5 ⊢ (𝜑 → ∀𝑎 ∈ ℝ ∀𝑏 ∈ ℝ ((𝑎 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑎) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝑎 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))
86	45, 85, 5	rspcdva 2873	. . . 4 ⊢ (𝜑 → ∀𝑏 ∈ ℝ ((𝐴 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑏)) → ∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝑏 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))
87	36, 86, 19	rspcdva 2873	. . 3 ⊢ (𝜑 → ((𝐴 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐴) < 0 ∧ 0 < ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝐵)) → ∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)))
88	28, 87	mpd 13	. 2 ⊢ (𝜑 → ∃𝑥 ∈ ℝ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))
89	5	adantr 276	. . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝐴 ∈ ℝ)
90	89	rexrd 8093	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝐴 ∈ ℝ^*)
91	19	adantr 276	. . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝐵 ∈ ℝ)
92	91	rexrd 8093	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝐵 ∈ ℝ^*)
93		simprl 529	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝑥 ∈ ℝ)
94	90, 92, 93	3jca 1179	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → (𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝑥 ∈ ℝ))
95		simprr1 1047	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝐴 < 𝑥)
96		simprr2 1048	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝑥 < 𝐵)
97	95, 96	jca 306	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → (𝐴 < 𝑥 ∧ 𝑥 < 𝐵))
98		elioo4g 10026	. . . 4 ⊢ (𝑥 ∈ (𝐴(,)𝐵) ↔ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝑥 ∈ ℝ) ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵)))
99	94, 97, 98	sylanbrc 417	. . 3 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝑥 ∈ (𝐴(,)𝐵))
100	8	adantr 276	. . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝐹:ℝ⟶ℝ)
101	100, 93	ffvelcdmd 5701	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → (𝐹‘𝑥) ∈ ℝ)
102	101	recnd 8072	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → (𝐹‘𝑥) ∈ ℂ)
103	58	adantr 276	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝑈 ∈ ℂ)
104		fveq2 5561	. . . . . . 7 ⊢ (𝑟 = 𝑥 → (𝐹‘𝑟) = (𝐹‘𝑥))
105	104	oveq1d 5940	. . . . . 6 ⊢ (𝑟 = 𝑥 → ((𝐹‘𝑟) − 𝑈) = ((𝐹‘𝑥) − 𝑈))
106	10	adantr 276	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → 𝑈 ∈ ℝ)
107	101, 106	resubcld 8424	. . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → ((𝐹‘𝑥) − 𝑈) ∈ ℝ)
108	2, 105, 93, 107	fvmptd3 5658	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = ((𝐹‘𝑥) − 𝑈))
109		simprr3 1049	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0)
110	108, 109	eqtr3d 2231	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → ((𝐹‘𝑥) − 𝑈) = 0)
111	102, 103, 110	subeq0d 8362	. . 3 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → (𝐹‘𝑥) = 𝑈)
112		fveqeq2 5570	. . . 4 ⊢ (𝑐 = 𝑥 → ((𝐹‘𝑐) = 𝑈 ↔ (𝐹‘𝑥) = 𝑈))
113	112	rspcev 2868	. . 3 ⊢ ((𝑥 ∈ (𝐴(,)𝐵) ∧ (𝐹‘𝑥) = 𝑈) → ∃𝑐 ∈ (𝐴(,)𝐵)(𝐹‘𝑐) = 𝑈)
114	99, 111, 113	syl2anc 411	. 2 ⊢ ((𝜑 ∧ (𝑥 ∈ ℝ ∧ (𝐴 < 𝑥 ∧ 𝑥 < 𝐵 ∧ ((𝑟 ∈ ℝ ↦ ((𝐹‘𝑟) − 𝑈))‘𝑥) = 0))) → ∃𝑐 ∈ (𝐴(,)𝐵)(𝐹‘𝑐) = 𝑈)
115	88, 114	rexlimddv 2619	1 ⊢ (𝜑 → ∃𝑐 ∈ (𝐴(,)𝐵)(𝐹‘𝑐) = 𝑈)

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∧ w3a 980 ∀wal 1362 = wceq 1364 ∈ wcel 2167 ∀wral 2475 ∃wrex 2476 ⊆ wss 3157 class class class wbr 4034 ↦ cmpt 4095 ⟶wf 5255 ‘cfv 5259 (class class class)co 5925 ℂcc 7894 ℝcr 7895 0cc0 7896 ℝ^*cxr 8077 < clt 8078 − cmin 8214 (,)cioo 9980 –cn→ccncf 14890

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-coll 4149 ax-sep 4152 ax-nul 4160 ax-pow 4208 ax-pr 4243 ax-un 4469 ax-setind 4574 ax-iinf 4625 ax-cnex 7987 ax-resscn 7988 ax-1cn 7989 ax-1re 7990 ax-icn 7991 ax-addcl 7992 ax-addrcl 7993 ax-mulcl 7994 ax-mulrcl 7995 ax-addcom 7996 ax-mulcom 7997 ax-addass 7998 ax-mulass 7999 ax-distr 8000 ax-i2m1 8001 ax-0lt1 8002 ax-1rid 8003 ax-0id 8004 ax-rnegex 8005 ax-precex 8006 ax-cnre 8007 ax-pre-ltirr 8008 ax-pre-ltwlin 8009 ax-pre-lttrn 8010 ax-pre-apti 8011 ax-pre-ltadd 8012 ax-pre-mulgt0 8013 ax-pre-mulext 8014 ax-arch 8015 ax-caucvg 8016

This theorem depends on definitions: df-bi 117 df-stab 832 df-dc 836 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-nel 2463 df-ral 2480 df-rex 2481 df-reu 2482 df-rmo 2483 df-rab 2484 df-v 2765 df-sbc 2990 df-csb 3085 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-nul 3452 df-if 3563 df-pw 3608 df-sn 3629 df-pr 3630 df-op 3632 df-uni 3841 df-int 3876 df-iun 3919 df-br 4035 df-opab 4096 df-mpt 4097 df-tr 4133 df-id 4329 df-po 4332 df-iso 4333 df-iord 4402 df-on 4404 df-ilim 4405 df-suc 4407 df-iom 4628 df-xp 4670 df-rel 4671 df-cnv 4672 df-co 4673 df-dm 4674 df-rn 4675 df-res 4676 df-ima 4677 df-iota 5220 df-fun 5261 df-fn 5262 df-f 5263 df-f1 5264 df-fo 5265 df-f1o 5266 df-fv 5267 df-isom 5268 df-riota 5880 df-ov 5928 df-oprab 5929 df-mpo 5930 df-1st 6207 df-2nd 6208 df-recs 6372 df-frec 6458 df-map 6718 df-sup 7059 df-inf 7060 df-pnf 8080 df-mnf 8081 df-xr 8082 df-ltxr 8083 df-le 8084 df-sub 8216 df-neg 8217 df-reap 8619 df-ap 8626 df-div 8717 df-inn 9008 df-2 9066 df-3 9067 df-4 9068 df-n0 9267 df-z 9344 df-uz 9619 df-q 9711 df-rp 9746 df-xneg 9864 df-xadd 9865 df-ioo 9984 df-seqfrec 10557 df-exp 10648 df-cj 11024 df-re 11025 df-im 11026 df-rsqrt 11180 df-abs 11181 df-rest 12943 df-topgen 12962 df-psmet 14175 df-xmet 14176 df-met 14177 df-bl 14178 df-mopn 14179 df-top 14318 df-topon 14331 df-bases 14363 df-cn 14508 df-cnp 14509 df-tx 14573 df-cncf 14891

This theorem is referenced by: ivthdichlem 14971

W3C validator