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Theorem cncfco 24820

Description: The composition of two continuous maps on complex numbers is also continuous. (Contributed by Jeff Madsen, 2-Sep-2009.) (Revised by Mario Carneiro, 25-Aug-2014.)

**Hypotheses**
Ref	Expression
cncfco.4	⊢ (𝜑 → 𝐹 ∈ (𝐴–cn→𝐵))
cncfco.5	⊢ (𝜑 → 𝐺 ∈ (𝐵–cn→𝐶))

**Assertion**
Ref	Expression
cncfco	⊢ (𝜑 → (𝐺 ∘ 𝐹) ∈ (𝐴–cn→𝐶))

Proof of Theorem cncfco Dummy variables 𝑤 𝑢 𝑥 𝑦 𝑧 𝑣 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		cncfco.5	. . . 4 ⊢ (𝜑 → 𝐺 ∈ (𝐵–cn→𝐶))
2		cncff 24806	. . . 4 ⊢ (𝐺 ∈ (𝐵–cn→𝐶) → 𝐺:𝐵⟶𝐶)
3	1, 2	syl 17	. . 3 ⊢ (𝜑 → 𝐺:𝐵⟶𝐶)
4		cncfco.4	. . . 4 ⊢ (𝜑 → 𝐹 ∈ (𝐴–cn→𝐵))
5		cncff 24806	. . . 4 ⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐹:𝐴⟶𝐵)
6	4, 5	syl 17	. . 3 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
7		fco 6741	. . 3 ⊢ ((𝐺:𝐵⟶𝐶 ∧ 𝐹:𝐴⟶𝐵) → (𝐺 ∘ 𝐹):𝐴⟶𝐶)
8	3, 6, 7	syl2anc 583	. 2 ⊢ (𝜑 → (𝐺 ∘ 𝐹):𝐴⟶𝐶)
9	1	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) → 𝐺 ∈ (𝐵–cn→𝐶))
10	6	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) → 𝐹:𝐴⟶𝐵)
11		simprl 770	. . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) → 𝑥 ∈ 𝐴)
12	10, 11	ffvelcdmd 7089	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) → (𝐹‘𝑥) ∈ 𝐵)
13		simprr 772	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) → 𝑦 ∈ ℝ⁺)
14		cncfi 24807	. . . . 5 ⊢ ((𝐺 ∈ (𝐵–cn→𝐶) ∧ (𝐹‘𝑥) ∈ 𝐵 ∧ 𝑦 ∈ ℝ⁺) → ∃𝑢 ∈ ℝ⁺ ∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦))
15	9, 12, 13, 14	syl3anc 1369	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) → ∃𝑢 ∈ ℝ⁺ ∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦))
16	4	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) → 𝐹 ∈ (𝐴–cn→𝐵))
17		simplrl 776	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) → 𝑥 ∈ 𝐴)
18		simpr 484	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) → 𝑢 ∈ ℝ⁺)
19		cncfi 24807	. . . . . . 7 ⊢ ((𝐹 ∈ (𝐴–cn→𝐵) ∧ 𝑥 ∈ 𝐴 ∧ 𝑢 ∈ ℝ⁺) → ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢))
20	16, 17, 18, 19	syl3anc 1369	. . . . . 6 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) → ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢))
21	6	ad3antrrr 729	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → 𝐹:𝐴⟶𝐵)
22		simprr 772	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → 𝑤 ∈ 𝐴)
23	21, 22	ffvelcdmd 7089	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → (𝐹‘𝑤) ∈ 𝐵)
24		fvoveq1 7437	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑣 = (𝐹‘𝑤) → (abs‘(𝑣 − (𝐹‘𝑥))) = (abs‘((𝐹‘𝑤) − (𝐹‘𝑥))))
25	24	breq1d 5152	. . . . . . . . . . . . . . . . 17 ⊢ (𝑣 = (𝐹‘𝑤) → ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 ↔ (abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢))
26	25	imbrov2fvoveq 7439	. . . . . . . . . . . . . . . 16 ⊢ (𝑣 = (𝐹‘𝑤) → (((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦) ↔ ((abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘(𝐹‘𝑤)) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)))
27	26	rspcv 3604	. . . . . . . . . . . . . . 15 ⊢ ((𝐹‘𝑤) ∈ 𝐵 → (∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦) → ((abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘(𝐹‘𝑤)) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)))
28	23, 27	syl 17	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → (∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦) → ((abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘(𝐹‘𝑤)) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)))
29		fvco3 6991	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝑤 ∈ 𝐴) → ((𝐺 ∘ 𝐹)‘𝑤) = (𝐺‘(𝐹‘𝑤)))
30	21, 22, 29	syl2anc 583	. . . . . . . . . . . . . . . . . 18 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → ((𝐺 ∘ 𝐹)‘𝑤) = (𝐺‘(𝐹‘𝑤)))
31	17	adantr 480	. . . . . . . . . . . . . . . . . . 19 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → 𝑥 ∈ 𝐴)
32		fvco3 6991	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝑥 ∈ 𝐴) → ((𝐺 ∘ 𝐹)‘𝑥) = (𝐺‘(𝐹‘𝑥)))
33	21, 31, 32	syl2anc 583	. . . . . . . . . . . . . . . . . 18 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → ((𝐺 ∘ 𝐹)‘𝑥) = (𝐺‘(𝐹‘𝑥)))
34	30, 33	oveq12d 7432	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → (((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥)) = ((𝐺‘(𝐹‘𝑤)) − (𝐺‘(𝐹‘𝑥))))
35	34	fveq2d 6895	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) = (abs‘((𝐺‘(𝐹‘𝑤)) − (𝐺‘(𝐹‘𝑥)))))
36	35	breq1d 5152	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → ((abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦 ↔ (abs‘((𝐺‘(𝐹‘𝑤)) − (𝐺‘(𝐹‘𝑥)))) < 𝑦))
37	36	imbi2d 340	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → (((abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦) ↔ ((abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘(𝐹‘𝑤)) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)))
38	28, 37	sylibrd 259	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → (∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦) → ((abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦)))
39	38	imp 406	. . . . . . . . . . . 12 ⊢ (((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) ∧ ∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)) → ((abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦))
40	39	an32s 651	. . . . . . . . . . 11 ⊢ (((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ ∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → ((abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦))
41	40	imim2d 57	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ ∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)) ∧ (𝑧 ∈ ℝ⁺ ∧ 𝑤 ∈ 𝐴)) → (((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢) → ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦)))
42	41	anassrs 467	. . . . . . . . 9 ⊢ ((((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ ∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)) ∧ 𝑧 ∈ ℝ⁺) ∧ 𝑤 ∈ 𝐴) → (((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢) → ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦)))
43	42	ralimdva 3163	. . . . . . . 8 ⊢ (((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ ∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)) ∧ 𝑧 ∈ ℝ⁺) → (∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢) → ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦)))
44	43	reximdva 3164	. . . . . . 7 ⊢ ((((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) ∧ ∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦)) → (∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢) → ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦)))
45	44	ex 412	. . . . . 6 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) → (∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦) → (∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘((𝐹‘𝑤) − (𝐹‘𝑥))) < 𝑢) → ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦))))
46	20, 45	mpid 44	. . . . 5 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) ∧ 𝑢 ∈ ℝ⁺) → (∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦) → ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦)))
47	46	rexlimdva 3151	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) → (∃𝑢 ∈ ℝ⁺ ∀𝑣 ∈ 𝐵 ((abs‘(𝑣 − (𝐹‘𝑥))) < 𝑢 → (abs‘((𝐺‘𝑣) − (𝐺‘(𝐹‘𝑥)))) < 𝑦) → ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦)))
48	15, 47	mpd 15	. . 3 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ ℝ⁺)) → ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦))
49	48	ralrimivva 3196	. 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ ℝ⁺ ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦))
50		cncfrss 24804	. . . 4 ⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐴 ⊆ ℂ)
51	4, 50	syl 17	. . 3 ⊢ (𝜑 → 𝐴 ⊆ ℂ)
52		cncfrss2 24805	. . . 4 ⊢ (𝐺 ∈ (𝐵–cn→𝐶) → 𝐶 ⊆ ℂ)
53	1, 52	syl 17	. . 3 ⊢ (𝜑 → 𝐶 ⊆ ℂ)
54		elcncf2 24803	. . 3 ⊢ ((𝐴 ⊆ ℂ ∧ 𝐶 ⊆ ℂ) → ((𝐺 ∘ 𝐹) ∈ (𝐴–cn→𝐶) ↔ ((𝐺 ∘ 𝐹):𝐴⟶𝐶 ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ ℝ⁺ ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦))))
55	51, 53, 54	syl2anc 583	. 2 ⊢ (𝜑 → ((𝐺 ∘ 𝐹) ∈ (𝐴–cn→𝐶) ↔ ((𝐺 ∘ 𝐹):𝐴⟶𝐶 ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ ℝ⁺ ∃𝑧 ∈ ℝ⁺ ∀𝑤 ∈ 𝐴 ((abs‘(𝑤 − 𝑥)) < 𝑧 → (abs‘(((𝐺 ∘ 𝐹)‘𝑤) − ((𝐺 ∘ 𝐹)‘𝑥))) < 𝑦))))
56	8, 49, 55	mpbir2and 712	1 ⊢ (𝜑 → (𝐺 ∘ 𝐹) ∈ (𝐴–cn→𝐶))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1534 ∈ wcel 2099 ∀wral 3057 ∃wrex 3066 ⊆ wss 3945 class class class wbr 5142 ∘ ccom 5676 ⟶wf 6538 ‘cfv 6542 (class class class)co 7414 ℂcc 11130 < clt 11272 − cmin 11468 ℝ⁺crp 13000 abscabs 15207 –cn→ccncf 24789

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-br 5143 df-opab 5205 df-mpt 5226 df-id 5570 df-po 5584 df-so 5585 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-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 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-er 8718 df-map 8840 df-en 8958 df-dom 8959 df-sdom 8960 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-div 11896 df-2 12299 df-cj 15072 df-re 15073 df-im 15074 df-abs 15209 df-cncf 24791

This theorem is referenced by: cncfcompt2 24821 cncfmpt1f 24827 negfcncf 24837 divcncf 25369 cniccbdd 25383 cncombf 25580 cnmbf 25581 dvlip 25919 dvlipcn 25920 itgsubstlem 25976 sincn 26374 coscn 26375 logcn 26574 lgamgulmlem2 26955 ftalem3 27000 evthiccabs 44875 mulc1cncfg 44971 expcnfg 44973 cncfcompt 45265 cncficcgt0 45270 dirkercncflem2 45486 dirkercncflem4 45488 fourierdlem18 45507 fourierdlem93 45581 fourierdlem101 45589 fourierdlem111 45599

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