Theorem bfp 35262

Description: Banach fixed point theorem, also known as contraction mapping theorem. A contraction on a complete metric space has a unique fixed point. We show existence in the lemmas, and uniqueness here - if 𝐹 has two fixed points, then the distance between them is less than 𝐾 times itself, a contradiction. (Contributed by Jeff Madsen, 2-Sep-2009.) (Proof shortened by Mario Carneiro, 5-Jun-2014.)

Hypotheses

Ref	Expression
bfp.2	⊢ (𝜑 → 𝐷 ∈ (CMet‘𝑋))
bfp.3	⊢ (𝜑 → 𝑋 ≠ ∅)
bfp.4	⊢ (𝜑 → 𝐾 ∈ ℝ+)
bfp.5	⊢ (𝜑 → 𝐾 < 1)
bfp.6	⊢ (𝜑 → 𝐹:𝑋⟶𝑋)
bfp.7	⊢ ((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) ≤ (𝐾 · (𝑥𝐷𝑦)))

Assertion

Ref	Expression
bfp	⊢ (𝜑 → ∃!𝑧 ∈ 𝑋 (𝐹‘𝑧) = 𝑧)

Distinct variable groups:   𝑥,𝑦,𝑧,𝐷   𝜑,𝑥,𝑦   𝑥,𝐹,𝑦,𝑧   𝑥,𝐾,𝑦   𝑥,𝑋,𝑦,𝑧

Allowed substitution hints:   𝜑(𝑧)   𝐾(𝑧)

Proof of Theorem bfp

Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		bfp.3	. . . 4 ⊢ (𝜑 → 𝑋 ≠ ∅)
2		n0 4260	. . . 4 ⊢ (𝑋 ≠ ∅ ↔ ∃𝑤 𝑤 ∈ 𝑋)
3	1, 2	sylib 221	. . 3 ⊢ (𝜑 → ∃𝑤 𝑤 ∈ 𝑋)
4		bfp.2	. . . . 5 ⊢ (𝜑 → 𝐷 ∈ (CMet‘𝑋))
5	4	adantr 484	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝐷 ∈ (CMet‘𝑋))
6	1	adantr 484	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝑋 ≠ ∅)
7		bfp.4	. . . . 5 ⊢ (𝜑 → 𝐾 ∈ ℝ+)
8	7	adantr 484	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝐾 ∈ ℝ+)
9		bfp.5	. . . . 5 ⊢ (𝜑 → 𝐾 < 1)
10	9	adantr 484	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝐾 < 1)
11		bfp.6	. . . . 5 ⊢ (𝜑 → 𝐹:𝑋⟶𝑋)
12	11	adantr 484	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝐹:𝑋⟶𝑋)
13		bfp.7	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) ≤ (𝐾 · (𝑥𝐷𝑦)))
14	13	adantlr 714	. . . 4 ⊢ (((𝜑 ∧ 𝑤 ∈ 𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) ≤ (𝐾 · (𝑥𝐷𝑦)))
15		eqid 2798	. . . 4 ⊢ (MetOpen‘𝐷) = (MetOpen‘𝐷)
16		simpr 488	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝑤 ∈ 𝑋)
17		eqid 2798	. . . 4 ⊢ seq1((𝐹 ∘ 1st ), (ℕ × {𝑤})) = seq1((𝐹 ∘ 1st ), (ℕ × {𝑤}))
18	5, 6, 8, 10, 12, 14, 15, 16, 17	bfplem2 35261	. . 3 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → ∃𝑧 ∈ 𝑋 (𝐹‘𝑧) = 𝑧)
19	3, 18	exlimddv 1936	. 2 ⊢ (𝜑 → ∃𝑧 ∈ 𝑋 (𝐹‘𝑧) = 𝑧)
20		oveq12 7144	. . . . . . . . . . . 12 ⊢ (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) = (𝑥𝐷𝑦))
21	20	adantl 485	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) = (𝑥𝐷𝑦))
22	13	adantr 484	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) ≤ (𝐾 · (𝑥𝐷𝑦)))
23	21, 22	eqbrtrrd 5054	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) ≤ (𝐾 · (𝑥𝐷𝑦)))
24		cmetmet 23890	. . . . . . . . . . . . . 14 ⊢ (𝐷 ∈ (CMet‘𝑋) → 𝐷 ∈ (Met‘𝑋))
25	4, 24	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐷 ∈ (Met‘𝑋))
26	25	ad2antrr 725	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝐷 ∈ (Met‘𝑋))
27		simplrl 776	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝑥 ∈ 𝑋)
28		simplrr 777	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝑦 ∈ 𝑋)
29		metcl 22939	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑥𝐷𝑦) ∈ ℝ)
30	26, 27, 28, 29	syl3anc 1368	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) ∈ ℝ)
31	7	rpred 12419	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐾 ∈ ℝ)
32	31	ad2antrr 725	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝐾 ∈ ℝ)
33	32, 30	remulcld 10660	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝐾 · (𝑥𝐷𝑦)) ∈ ℝ)
34	30, 33	suble0d 11220	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (((𝑥𝐷𝑦) − (𝐾 · (𝑥𝐷𝑦))) ≤ 0 ↔ (𝑥𝐷𝑦) ≤ (𝐾 · (𝑥𝐷𝑦))))
35	23, 34	mpbird 260	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝑥𝐷𝑦) − (𝐾 · (𝑥𝐷𝑦))) ≤ 0)
36		1cnd 10625	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 1 ∈ ℂ)
37	32	recnd 10658	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝐾 ∈ ℂ)
38	30	recnd 10658	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) ∈ ℂ)
39	36, 37, 38	subdird 11086	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 − 𝐾) · (𝑥𝐷𝑦)) = ((1 · (𝑥𝐷𝑦)) − (𝐾 · (𝑥𝐷𝑦))))
40	38	mulid2d 10648	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (1 · (𝑥𝐷𝑦)) = (𝑥𝐷𝑦))
41	40	oveq1d 7150	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 · (𝑥𝐷𝑦)) − (𝐾 · (𝑥𝐷𝑦))) = ((𝑥𝐷𝑦) − (𝐾 · (𝑥𝐷𝑦))))
42	39, 41	eqtrd 2833	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 − 𝐾) · (𝑥𝐷𝑦)) = ((𝑥𝐷𝑦) − (𝐾 · (𝑥𝐷𝑦))))
43		1re 10630	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℝ
44		resubcl 10939	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℝ ∧ 𝐾 ∈ ℝ) → (1 − 𝐾) ∈ ℝ)
45	43, 31, 44	sylancr 590	. . . . . . . . . . . 12 ⊢ (𝜑 → (1 − 𝐾) ∈ ℝ)
46	45	ad2antrr 725	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (1 − 𝐾) ∈ ℝ)
47	46	recnd 10658	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (1 − 𝐾) ∈ ℂ)
48	47	mul01d 10828	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 − 𝐾) · 0) = 0)
49	35, 42, 48	3brtr4d 5062	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 − 𝐾) · (𝑥𝐷𝑦)) ≤ ((1 − 𝐾) · 0))
50		0red 10633	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 0 ∈ ℝ)
51		posdif 11122	. . . . . . . . . . . 12 ⊢ ((𝐾 ∈ ℝ ∧ 1 ∈ ℝ) → (𝐾 < 1 ↔ 0 < (1 − 𝐾)))
52	31, 43, 51	sylancl 589	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐾 < 1 ↔ 0 < (1 − 𝐾)))
53	9, 52	mpbid 235	. . . . . . . . . 10 ⊢ (𝜑 → 0 < (1 − 𝐾))
54	53	ad2antrr 725	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 0 < (1 − 𝐾))
55		lemul2 11482	. . . . . . . . 9 ⊢ (((𝑥𝐷𝑦) ∈ ℝ ∧ 0 ∈ ℝ ∧ ((1 − 𝐾) ∈ ℝ ∧ 0 < (1 − 𝐾))) → ((𝑥𝐷𝑦) ≤ 0 ↔ ((1 − 𝐾) · (𝑥𝐷𝑦)) ≤ ((1 − 𝐾) · 0)))
56	30, 50, 46, 54, 55	syl112anc 1371	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝑥𝐷𝑦) ≤ 0 ↔ ((1 − 𝐾) · (𝑥𝐷𝑦)) ≤ ((1 − 𝐾) · 0)))
57	49, 56	mpbird 260	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) ≤ 0)
58		metge0 22952	. . . . . . . 8 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → 0 ≤ (𝑥𝐷𝑦))
59	26, 27, 28, 58	syl3anc 1368	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 0 ≤ (𝑥𝐷𝑦))
60		0re 10632	. . . . . . . 8 ⊢ 0 ∈ ℝ
61		letri3 10715	. . . . . . . 8 ⊢ (((𝑥𝐷𝑦) ∈ ℝ ∧ 0 ∈ ℝ) → ((𝑥𝐷𝑦) = 0 ↔ ((𝑥𝐷𝑦) ≤ 0 ∧ 0 ≤ (𝑥𝐷𝑦))))
62	30, 60, 61	sylancl 589	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝑥𝐷𝑦) = 0 ↔ ((𝑥𝐷𝑦) ≤ 0 ∧ 0 ≤ (𝑥𝐷𝑦))))
63	57, 59, 62	mpbir2and 712	. . . . . 6 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) = 0)
64		meteq0 22946	. . . . . . 7 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → ((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦))
65	26, 27, 28, 64	syl3anc 1368	. . . . . 6 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦))
66	63, 65	mpbid 235	. . . . 5 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝑥 = 𝑦)
67	66	ex 416	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → 𝑥 = 𝑦))
68	67	ralrimivva 3156	. . 3 ⊢ (𝜑 → ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → 𝑥 = 𝑦))
69		fveq2 6645	. . . . . . . 8 ⊢ (𝑥 = 𝑧 → (𝐹‘𝑥) = (𝐹‘𝑧))
70		id 22	. . . . . . . 8 ⊢ (𝑥 = 𝑧 → 𝑥 = 𝑧)
71	69, 70	eqeq12d 2814	. . . . . . 7 ⊢ (𝑥 = 𝑧 → ((𝐹‘𝑥) = 𝑥 ↔ (𝐹‘𝑧) = 𝑧))
72	71	anbi1d 632	. . . . . 6 ⊢ (𝑥 = 𝑧 → (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) ↔ ((𝐹‘𝑧) = 𝑧 ∧ (𝐹‘𝑦) = 𝑦)))
73		equequ1 2032	. . . . . 6 ⊢ (𝑥 = 𝑧 → (𝑥 = 𝑦 ↔ 𝑧 = 𝑦))
74	72, 73	imbi12d 348	. . . . 5 ⊢ (𝑥 = 𝑧 → ((((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → 𝑥 = 𝑦) ↔ (((𝐹‘𝑧) = 𝑧 ∧ (𝐹‘𝑦) = 𝑦) → 𝑧 = 𝑦)))
75	74	ralbidv 3162	. . . 4 ⊢ (𝑥 = 𝑧 → (∀𝑦 ∈ 𝑋 (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → 𝑥 = 𝑦) ↔ ∀𝑦 ∈ 𝑋 (((𝐹‘𝑧) = 𝑧 ∧ (𝐹‘𝑦) = 𝑦) → 𝑧 = 𝑦)))
76	75	cbvralvw 3396	. . 3 ⊢ (∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → 𝑥 = 𝑦) ↔ ∀𝑧 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝐹‘𝑧) = 𝑧 ∧ (𝐹‘𝑦) = 𝑦) → 𝑧 = 𝑦))
77	68, 76	sylib 221	. 2 ⊢ (𝜑 → ∀𝑧 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝐹‘𝑧) = 𝑧 ∧ (𝐹‘𝑦) = 𝑦) → 𝑧 = 𝑦))
78		fveq2 6645	. . . 4 ⊢ (𝑧 = 𝑦 → (𝐹‘𝑧) = (𝐹‘𝑦))
79		id 22	. . . 4 ⊢ (𝑧 = 𝑦 → 𝑧 = 𝑦)
80	78, 79	eqeq12d 2814	. . 3 ⊢ (𝑧 = 𝑦 → ((𝐹‘𝑧) = 𝑧 ↔ (𝐹‘𝑦) = 𝑦))
81	80	reu4 3670	. 2 ⊢ (∃!𝑧 ∈ 𝑋 (𝐹‘𝑧) = 𝑧 ↔ (∃𝑧 ∈ 𝑋 (𝐹‘𝑧) = 𝑧 ∧ ∀𝑧 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝐹‘𝑧) = 𝑧 ∧ (𝐹‘𝑦) = 𝑦) → 𝑧 = 𝑦)))
82	19, 77, 81	sylanbrc 586	1 ⊢ (𝜑 → ∃!𝑧 ∈ 𝑋 (𝐹‘𝑧) = 𝑧)

Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 399   = wceq 1538  ∃wex 1781   ∈ wcel 2111   ≠ wne 2987  ∀wral 3106  ∃wrex 3107  ∃!wreu 3108  ∅c0 4243  {csn 4525   class class class wbr 5030   × cxp 5517   ∘ ccom 5523  ⟶wf 6320  ‘cfv 6324  (class class class)co 7135  1^st c1st 7669  ℝcr 10525  0cc0 10526  1c1 10527   · cmul 10531   < clt 10664   ≤ cle 10665   − cmin 10859  ℕcn 11625  ℝ⁺crp 12377  seqcseq 13364  Metcmet 20077  MetOpencmopn 20081  CMetccmet 23858

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-rep 5154  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295  ax-un 7441  ax-inf2 9088  ax-cnex 10582  ax-resscn 10583  ax-1cn 10584  ax-icn 10585  ax-addcl 10586  ax-addrcl 10587  ax-mulcl 10588  ax-mulrcl 10589  ax-mulcom 10590  ax-addass 10591  ax-mulass 10592  ax-distr 10593  ax-i2m1 10594  ax-1ne0 10595  ax-1rid 10596  ax-rnegex 10597  ax-rrecex 10598  ax-cnre 10599  ax-pre-lttri 10600  ax-pre-lttrn 10601  ax-pre-ltadd 10602  ax-pre-mulgt0 10603  ax-pre-sup 10604

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-nel 3092  df-ral 3111  df-rex 3112  df-reu 3113  df-rmo 3114  df-rab 3115  df-v 3443  df-sbc 3721  df-csb 3829  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-pss 3900  df-nul 4244  df-if 4426  df-pw 4499  df-sn 4526  df-pr 4528  df-tp 4530  df-op 4532  df-uni 4801  df-int 4839  df-iun 4883  df-br 5031  df-opab 5093  df-mpt 5111  df-tr 5137  df-id 5425  df-eprel 5430  df-po 5438  df-so 5439  df-fr 5478  df-se 5479  df-we 5480  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-res 5531  df-ima 5532  df-pred 6116  df-ord 6162  df-on 6163  df-lim 6164  df-suc 6165  df-iota 6283  df-fun 6326  df-fn 6327  df-f 6328  df-f1 6329  df-fo 6330  df-f1o 6331  df-fv 6332  df-isom 6333  df-riota 7093  df-ov 7138  df-oprab 7139  df-mpo 7140  df-om 7561  df-1st 7671  df-2nd 7672  df-wrecs 7930  df-recs 7991  df-rdg 8029  df-1o 8085  df-oadd 8089  df-er 8272  df-map 8391  df-pm 8392  df-en 8493  df-dom 8494  df-sdom 8495  df-fin 8496  df-sup 8890  df-inf 8891  df-oi 8958  df-card 9352  df-pnf 10666  df-mnf 10667  df-xr 10668  df-ltxr 10669  df-le 10670  df-sub 10861  df-neg 10862  df-div 11287  df-nn 11626  df-2 11688  df-3 11689  df-n0 11886  df-z 11970  df-uz 12232  df-q 12337  df-rp 12378  df-xneg 12495  df-xadd 12496  df-xmul 12497  df-ico 12732  df-icc 12733  df-fz 12886  df-fzo 13029  df-fl 13157  df-seq 13365  df-exp 13426  df-hash 13687  df-cj 14450  df-re 14451  df-im 14452  df-sqrt 14586  df-abs 14587  df-clim 14837  df-rlim 14838  df-sum 15035  df-rest 16688  df-topgen 16709  df-psmet 20083  df-xmet 20084  df-met 20085  df-bl 20086  df-mopn 20087  df-fbas 20088  df-fg 20089  df-top 21499  df-topon 21516  df-bases 21551  df-ntr 21625  df-nei 21703  df-lm 21834  df-haus 21920  df-fil 22451  df-fm 22543  df-flim 22544  df-flf 22545  df-cfil 23859  df-cau 23860  df-cmet 23861

This theorem is referenced by: (None)