Theorem fvineqsneu 35319

Description: A theorem about functions where the image of every point intersects the domain only at that point. (Contributed by ML, 27-Mar-2021.)

Assertion

Ref	Expression
fvineqsneu	⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → ∀𝑞 ∈ 𝐴 ∃!𝑥 ∈ ran 𝐹 𝑞 ∈ 𝑥)

Distinct variable groups:   𝐴,𝑞,𝑥   𝐹,𝑞,𝑥   𝐴,𝑝   𝐹,𝑝

Proof of Theorem fvineqsneu

Dummy variables 𝑜 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		fnfvelrn 6901	. . . . . 6 ⊢ ((𝐹 Fn 𝐴 ∧ 𝑜 ∈ 𝐴) → (𝐹‘𝑜) ∈ ran 𝐹)
2	1	ex 416	. . . . 5 ⊢ (𝐹 Fn 𝐴 → (𝑜 ∈ 𝐴 → (𝐹‘𝑜) ∈ ran 𝐹))
3	2	adantr 484	. . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑜 ∈ 𝐴 → (𝐹‘𝑜) ∈ ran 𝐹))
4		fnrnfv 6772	. . . . . . . . . 10 ⊢ (𝐹 Fn 𝐴 → ran 𝐹 = {𝑦 ∣ ∃𝑝 ∈ 𝐴 𝑦 = (𝐹‘𝑝)})
5	4	abeq2d 2871	. . . . . . . . 9 ⊢ (𝐹 Fn 𝐴 → (𝑦 ∈ ran 𝐹 ↔ ∃𝑝 ∈ 𝐴 𝑦 = (𝐹‘𝑝)))
6	5	adantr 484	. . . . . . . 8 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑦 ∈ ran 𝐹 ↔ ∃𝑝 ∈ 𝐴 𝑦 = (𝐹‘𝑝)))
7		nfv 1922	. . . . . . . . . 10 ⊢ Ⅎ𝑝 𝐹 Fn 𝐴
8		nfra1 3140	. . . . . . . . . 10 ⊢ Ⅎ𝑝∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}
9	7, 8	nfan 1907	. . . . . . . . 9 ⊢ Ⅎ𝑝(𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝})
10		nfv 1922	. . . . . . . . 9 ⊢ Ⅎ𝑝∀𝑜 ∈ 𝐴 (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜))
11		eleq2 2826	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑦 = (𝐹‘𝑝) → (𝑜 ∈ 𝑦 ↔ 𝑜 ∈ (𝐹‘𝑝)))
12		elin 3882	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑜 ∈ ((𝐹‘𝑝) ∩ 𝐴) ↔ (𝑜 ∈ (𝐹‘𝑝) ∧ 𝑜 ∈ 𝐴))
13	12	rbaib 542	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑜 ∈ 𝐴 → (𝑜 ∈ ((𝐹‘𝑝) ∩ 𝐴) ↔ 𝑜 ∈ (𝐹‘𝑝)))
14	13	ad2antll 729	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴)) → (𝑜 ∈ ((𝐹‘𝑝) ∩ 𝐴) ↔ 𝑜 ∈ (𝐹‘𝑝)))
15		rsp 3127	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝} → (𝑝 ∈ 𝐴 → ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}))
16		eleq2 2826	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝐹‘𝑝) ∩ 𝐴) = {𝑝} → (𝑜 ∈ ((𝐹‘𝑝) ∩ 𝐴) ↔ 𝑜 ∈ {𝑝}))
17		velsn 4557	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑜 ∈ {𝑝} ↔ 𝑜 = 𝑝)
18		equcom 2026	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑜 = 𝑝 ↔ 𝑝 = 𝑜)
19	17, 18	bitri 278	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑜 ∈ {𝑝} ↔ 𝑝 = 𝑜)
20	16, 19	bitrdi 290	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝐹‘𝑝) ∩ 𝐴) = {𝑝} → (𝑜 ∈ ((𝐹‘𝑝) ∩ 𝐴) ↔ 𝑝 = 𝑜))
21	15, 20	syl6 35	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝} → (𝑝 ∈ 𝐴 → (𝑜 ∈ ((𝐹‘𝑝) ∩ 𝐴) ↔ 𝑝 = 𝑜)))
22	21	adantl 485	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑝 ∈ 𝐴 → (𝑜 ∈ ((𝐹‘𝑝) ∩ 𝐴) ↔ 𝑝 = 𝑜)))
23	22	adantrd 495	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → ((𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴) → (𝑜 ∈ ((𝐹‘𝑝) ∩ 𝐴) ↔ 𝑝 = 𝑜)))
24	23	imp 410	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴)) → (𝑜 ∈ ((𝐹‘𝑝) ∩ 𝐴) ↔ 𝑝 = 𝑜))
25	14, 24	bitr3d 284	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴)) → (𝑜 ∈ (𝐹‘𝑝) ↔ 𝑝 = 𝑜))
26	11, 25	sylan9bbr 514	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴)) ∧ 𝑦 = (𝐹‘𝑝)) → (𝑜 ∈ 𝑦 ↔ 𝑝 = 𝑜))
27	26	ex 416	. . . . . . . . . . . . . . . 16 ⊢ (((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴)) → (𝑦 = (𝐹‘𝑝) → (𝑜 ∈ 𝑦 ↔ 𝑝 = 𝑜)))
28	27	anass1rs 655	. . . . . . . . . . . . . . 15 ⊢ ((((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ 𝑜 ∈ 𝐴) ∧ 𝑝 ∈ 𝐴) → (𝑦 = (𝐹‘𝑝) → (𝑜 ∈ 𝑦 ↔ 𝑝 = 𝑜)))
29	28	impr 458	. . . . . . . . . . . . . 14 ⊢ ((((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ 𝑜 ∈ 𝐴) ∧ (𝑝 ∈ 𝐴 ∧ 𝑦 = (𝐹‘𝑝))) → (𝑜 ∈ 𝑦 ↔ 𝑝 = 𝑜))
30	29	an32s 652	. . . . . . . . . . . . 13 ⊢ ((((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑦 = (𝐹‘𝑝))) ∧ 𝑜 ∈ 𝐴) → (𝑜 ∈ 𝑦 ↔ 𝑝 = 𝑜))
31		eqeq1 2741	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑦 = (𝐹‘𝑝) → (𝑦 = (𝐹‘𝑜) ↔ (𝐹‘𝑝) = (𝐹‘𝑜)))
32		dffn3 6558	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝐹 Fn 𝐴 ↔ 𝐹:𝐴⟶ran 𝐹)
33		fvineqsnf1 35318	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝐹:𝐴⟶ran 𝐹 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → 𝐹:𝐴–1-1→ran 𝐹)
34	32, 33	sylanb 584	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → 𝐹:𝐴–1-1→ran 𝐹)
35		dff13 7067	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝐹:𝐴–1-1→ran 𝐹 ↔ (𝐹:𝐴⟶ran 𝐹 ∧ ∀𝑝 ∈ 𝐴 ∀𝑜 ∈ 𝐴 ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜)))
36	34, 35	sylib 221	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝐹:𝐴⟶ran 𝐹 ∧ ∀𝑝 ∈ 𝐴 ∀𝑜 ∈ 𝐴 ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜)))
37	36	simprd 499	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → ∀𝑝 ∈ 𝐴 ∀𝑜 ∈ 𝐴 ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜))
38		rsp 3127	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (∀𝑝 ∈ 𝐴 ∀𝑜 ∈ 𝐴 ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜) → (𝑝 ∈ 𝐴 → ∀𝑜 ∈ 𝐴 ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜)))
39	37, 38	syl 17	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑝 ∈ 𝐴 → ∀𝑜 ∈ 𝐴 ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜)))
40		rsp 3127	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (∀𝑜 ∈ 𝐴 ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜) → (𝑜 ∈ 𝐴 → ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜)))
41	39, 40	syl6 35	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑝 ∈ 𝐴 → (𝑜 ∈ 𝐴 → ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜))))
42	41	imp32 422	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴)) → ((𝐹‘𝑝) = (𝐹‘𝑜) → 𝑝 = 𝑜))
43		fveq2 6717	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑝 = 𝑜 → (𝐹‘𝑝) = (𝐹‘𝑜))
44	42, 43	impbid1 228	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴)) → ((𝐹‘𝑝) = (𝐹‘𝑜) ↔ 𝑝 = 𝑜))
45	31, 44	sylan9bbr 514	. . . . . . . . . . . . . . . . 17 ⊢ ((((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴)) ∧ 𝑦 = (𝐹‘𝑝)) → (𝑦 = (𝐹‘𝑜) ↔ 𝑝 = 𝑜))
46	45	ex 416	. . . . . . . . . . . . . . . 16 ⊢ (((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑜 ∈ 𝐴)) → (𝑦 = (𝐹‘𝑝) → (𝑦 = (𝐹‘𝑜) ↔ 𝑝 = 𝑜)))
47	46	anass1rs 655	. . . . . . . . . . . . . . 15 ⊢ ((((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ 𝑜 ∈ 𝐴) ∧ 𝑝 ∈ 𝐴) → (𝑦 = (𝐹‘𝑝) → (𝑦 = (𝐹‘𝑜) ↔ 𝑝 = 𝑜)))
48	47	impr 458	. . . . . . . . . . . . . 14 ⊢ ((((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ 𝑜 ∈ 𝐴) ∧ (𝑝 ∈ 𝐴 ∧ 𝑦 = (𝐹‘𝑝))) → (𝑦 = (𝐹‘𝑜) ↔ 𝑝 = 𝑜))
49	48	an32s 652	. . . . . . . . . . . . 13 ⊢ ((((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑦 = (𝐹‘𝑝))) ∧ 𝑜 ∈ 𝐴) → (𝑦 = (𝐹‘𝑜) ↔ 𝑝 = 𝑜))
50	30, 49	bitr4d 285	. . . . . . . . . . . 12 ⊢ ((((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑦 = (𝐹‘𝑝))) ∧ 𝑜 ∈ 𝐴) → (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜)))
51	50	ex 416	. . . . . . . . . . 11 ⊢ (((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑦 = (𝐹‘𝑝))) → (𝑜 ∈ 𝐴 → (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜))))
52	51	ralrimiv 3104	. . . . . . . . . 10 ⊢ (((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) ∧ (𝑝 ∈ 𝐴 ∧ 𝑦 = (𝐹‘𝑝))) → ∀𝑜 ∈ 𝐴 (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜)))
53	52	exp32 424	. . . . . . . . 9 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑝 ∈ 𝐴 → (𝑦 = (𝐹‘𝑝) → ∀𝑜 ∈ 𝐴 (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜)))))
54	9, 10, 53	rexlimd 3236	. . . . . . . 8 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (∃𝑝 ∈ 𝐴 𝑦 = (𝐹‘𝑝) → ∀𝑜 ∈ 𝐴 (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜))))
55	6, 54	sylbid 243	. . . . . . 7 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑦 ∈ ran 𝐹 → ∀𝑜 ∈ 𝐴 (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜))))
56		rsp 3127	. . . . . . 7 ⊢ (∀𝑜 ∈ 𝐴 (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜)) → (𝑜 ∈ 𝐴 → (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜))))
57	55, 56	syl6 35	. . . . . 6 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑦 ∈ ran 𝐹 → (𝑜 ∈ 𝐴 → (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜)))))
58	57	com23 86	. . . . 5 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑜 ∈ 𝐴 → (𝑦 ∈ ran 𝐹 → (𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜)))))
59	58	ralrimdv 3109	. . . 4 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑜 ∈ 𝐴 → ∀𝑦 ∈ ran 𝐹(𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜))))
60		reu6i 3641	. . . . 5 ⊢ (((𝐹‘𝑜) ∈ ran 𝐹 ∧ ∀𝑦 ∈ ran 𝐹(𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜))) → ∃!𝑦 ∈ ran 𝐹 𝑜 ∈ 𝑦)
61	60	ex 416	. . . 4 ⊢ ((𝐹‘𝑜) ∈ ran 𝐹 → (∀𝑦 ∈ ran 𝐹(𝑜 ∈ 𝑦 ↔ 𝑦 = (𝐹‘𝑜)) → ∃!𝑦 ∈ ran 𝐹 𝑜 ∈ 𝑦))
62	3, 59, 61	syl6c 70	. . 3 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → (𝑜 ∈ 𝐴 → ∃!𝑦 ∈ ran 𝐹 𝑜 ∈ 𝑦))
63	62	ralrimiv 3104	. 2 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → ∀𝑜 ∈ 𝐴 ∃!𝑦 ∈ ran 𝐹 𝑜 ∈ 𝑦)
64		nfv 1922	. . . 4 ⊢ Ⅎ𝑥 𝑞 = 𝑜
65		nfv 1922	. . . 4 ⊢ Ⅎ𝑦 𝑞 = 𝑜
66		nfvd 1923	. . . 4 ⊢ (𝑞 = 𝑜 → Ⅎ𝑦 𝑞 ∈ 𝑥)
67		nfvd 1923	. . . 4 ⊢ (𝑞 = 𝑜 → Ⅎ𝑥 𝑜 ∈ 𝑦)
68		eleq12 2827	. . . . 5 ⊢ ((𝑞 = 𝑜 ∧ 𝑥 = 𝑦) → (𝑞 ∈ 𝑥 ↔ 𝑜 ∈ 𝑦))
69	68	ex 416	. . . 4 ⊢ (𝑞 = 𝑜 → (𝑥 = 𝑦 → (𝑞 ∈ 𝑥 ↔ 𝑜 ∈ 𝑦)))
70	64, 65, 66, 67, 69	cbvreud 35281	. . 3 ⊢ (𝑞 = 𝑜 → (∃!𝑥 ∈ ran 𝐹 𝑞 ∈ 𝑥 ↔ ∃!𝑦 ∈ ran 𝐹 𝑜 ∈ 𝑦))
71	70	cbvralvw 3358	. 2 ⊢ (∀𝑞 ∈ 𝐴 ∃!𝑥 ∈ ran 𝐹 𝑞 ∈ 𝑥 ↔ ∀𝑜 ∈ 𝐴 ∃!𝑦 ∈ ran 𝐹 𝑜 ∈ 𝑦)
72	63, 71	sylibr 237	1 ⊢ ((𝐹 Fn 𝐴 ∧ ∀𝑝 ∈ 𝐴 ((𝐹‘𝑝) ∩ 𝐴) = {𝑝}) → ∀𝑞 ∈ 𝐴 ∃!𝑥 ∈ ran 𝐹 𝑞 ∈ 𝑥)

Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 399   = wceq 1543   ∈ wcel 2110  ∀wral 3061  ∃wrex 3062  ∃!wreu 3063   ∩ cin 3865  {csn 4541  ran crn 5552   Fn wfn 6375  ⟶wf 6376  –1-1→wf1 6377  ‘cfv 6380

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2708  ax-sep 5192  ax-nul 5199  ax-pr 5322

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2071  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2886  df-ral 3066  df-rex 3067  df-reu 3068  df-rab 3070  df-v 3410  df-dif 3869  df-un 3871  df-in 3873  df-ss 3883  df-nul 4238  df-if 4440  df-sn 4542  df-pr 4544  df-op 4548  df-uni 4820  df-br 5054  df-opab 5116  df-mpt 5136  df-id 5455  df-xp 5557  df-rel 5558  df-cnv 5559  df-co 5560  df-dm 5561  df-rn 5562  df-iota 6338  df-fun 6382  df-fn 6383  df-f 6384  df-f1 6385  df-fv 6388

This theorem is referenced by:  fvineqsneq  35320