Theorem bfp 32793

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 3890	. . . 4 ⊢ (𝑋 ≠ ∅ ↔ ∃𝑤 𝑤 ∈ 𝑋)
3	1, 2	sylib 207	. . 3 ⊢ (𝜑 → ∃𝑤 𝑤 ∈ 𝑋)
4		bfp.2	. . . . 5 ⊢ (𝜑 → 𝐷 ∈ (CMet‘𝑋))
5	4	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝐷 ∈ (CMet‘𝑋))
6	1	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝑋 ≠ ∅)
7		bfp.4	. . . . 5 ⊢ (𝜑 → 𝐾 ∈ ℝ+)
8	7	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝐾 ∈ ℝ+)
9		bfp.5	. . . . 5 ⊢ (𝜑 → 𝐾 < 1)
10	9	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝐾 < 1)
11		bfp.6	. . . . 5 ⊢ (𝜑 → 𝐹:𝑋⟶𝑋)
12	11	adantr 480	. . . 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 747	. . . 4 ⊢ (((𝜑 ∧ 𝑤 ∈ 𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) ≤ (𝐾 · (𝑥𝐷𝑦)))
15		eqid 2610	. . . 4 ⊢ (MetOpen‘𝐷) = (MetOpen‘𝐷)
16		simpr 476	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → 𝑤 ∈ 𝑋)
17		eqid 2610	. . . 4 ⊢ seq1((𝐹 ∘ 1st ), (ℕ × {𝑤})) = seq1((𝐹 ∘ 1st ), (ℕ × {𝑤}))
18	5, 6, 8, 10, 12, 14, 15, 16, 17	bfplem2 32792	. . 3 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑋) → ∃𝑧 ∈ 𝑋 (𝐹‘𝑧) = 𝑧)
19	3, 18	exlimddv 1850	. 2 ⊢ (𝜑 → ∃𝑧 ∈ 𝑋 (𝐹‘𝑧) = 𝑧)
20		oveq12 6558	. . . . . . . . . . . 12 ⊢ (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) = (𝑥𝐷𝑦))
21	20	adantl 481	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) = (𝑥𝐷𝑦))
22	13	adantr 480	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝐹‘𝑥)𝐷(𝐹‘𝑦)) ≤ (𝐾 · (𝑥𝐷𝑦)))
23	21, 22	eqbrtrrd 4607	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) ≤ (𝐾 · (𝑥𝐷𝑦)))
24		cmetmet 22892	. . . . . . . . . . . . . 14 ⊢ (𝐷 ∈ (CMet‘𝑋) → 𝐷 ∈ (Met‘𝑋))
25	4, 24	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐷 ∈ (Met‘𝑋))
26	25	ad2antrr 758	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝐷 ∈ (Met‘𝑋))
27		simplrl 796	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝑥 ∈ 𝑋)
28		simplrr 797	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝑦 ∈ 𝑋)
29		metcl 21947	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑥𝐷𝑦) ∈ ℝ)
30	26, 27, 28, 29	syl3anc 1318	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) ∈ ℝ)
31	7	rpred 11748	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐾 ∈ ℝ)
32	31	ad2antrr 758	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝐾 ∈ ℝ)
33	32, 30	remulcld 9949	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝐾 · (𝑥𝐷𝑦)) ∈ ℝ)
34	30, 33	suble0d 10497	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (((𝑥𝐷𝑦) − (𝐾 · (𝑥𝐷𝑦))) ≤ 0 ↔ (𝑥𝐷𝑦) ≤ (𝐾 · (𝑥𝐷𝑦))))
35	23, 34	mpbird 246	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝑥𝐷𝑦) − (𝐾 · (𝑥𝐷𝑦))) ≤ 0)
36		1cnd 9935	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 1 ∈ ℂ)
37	32	recnd 9947	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝐾 ∈ ℂ)
38	30	recnd 9947	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) ∈ ℂ)
39	36, 37, 38	subdird 10366	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 − 𝐾) · (𝑥𝐷𝑦)) = ((1 · (𝑥𝐷𝑦)) − (𝐾 · (𝑥𝐷𝑦))))
40	38	mulid2d 9937	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (1 · (𝑥𝐷𝑦)) = (𝑥𝐷𝑦))
41	40	oveq1d 6564	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 · (𝑥𝐷𝑦)) − (𝐾 · (𝑥𝐷𝑦))) = ((𝑥𝐷𝑦) − (𝐾 · (𝑥𝐷𝑦))))
42	39, 41	eqtrd 2644	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 − 𝐾) · (𝑥𝐷𝑦)) = ((𝑥𝐷𝑦) − (𝐾 · (𝑥𝐷𝑦))))
43		1re 9918	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℝ
44		resubcl 10224	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℝ ∧ 𝐾 ∈ ℝ) → (1 − 𝐾) ∈ ℝ)
45	43, 31, 44	sylancr 694	. . . . . . . . . . . 12 ⊢ (𝜑 → (1 − 𝐾) ∈ ℝ)
46	45	ad2antrr 758	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (1 − 𝐾) ∈ ℝ)
47	46	recnd 9947	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (1 − 𝐾) ∈ ℂ)
48	47	mul01d 10114	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 − 𝐾) · 0) = 0)
49	35, 42, 48	3brtr4d 4615	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((1 − 𝐾) · (𝑥𝐷𝑦)) ≤ ((1 − 𝐾) · 0))
50		0red 9920	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 0 ∈ ℝ)
51		posdif 10400	. . . . . . . . . . . 12 ⊢ ((𝐾 ∈ ℝ ∧ 1 ∈ ℝ) → (𝐾 < 1 ↔ 0 < (1 − 𝐾)))
52	31, 43, 51	sylancl 693	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐾 < 1 ↔ 0 < (1 − 𝐾)))
53	9, 52	mpbid 221	. . . . . . . . . 10 ⊢ (𝜑 → 0 < (1 − 𝐾))
54	53	ad2antrr 758	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 0 < (1 − 𝐾))
55		lemul2 10755	. . . . . . . . 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 1322	. . . . . . . 8 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝑥𝐷𝑦) ≤ 0 ↔ ((1 − 𝐾) · (𝑥𝐷𝑦)) ≤ ((1 − 𝐾) · 0)))
57	49, 56	mpbird 246	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) ≤ 0)
58		metge0 21960	. . . . . . . 8 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → 0 ≤ (𝑥𝐷𝑦))
59	26, 27, 28, 58	syl3anc 1318	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 0 ≤ (𝑥𝐷𝑦))
60		0re 9919	. . . . . . . 8 ⊢ 0 ∈ ℝ
61		letri3 10002	. . . . . . . 8 ⊢ (((𝑥𝐷𝑦) ∈ ℝ ∧ 0 ∈ ℝ) → ((𝑥𝐷𝑦) = 0 ↔ ((𝑥𝐷𝑦) ≤ 0 ∧ 0 ≤ (𝑥𝐷𝑦))))
62	30, 60, 61	sylancl 693	. . . . . . 7 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝑥𝐷𝑦) = 0 ↔ ((𝑥𝐷𝑦) ≤ 0 ∧ 0 ≤ (𝑥𝐷𝑦))))
63	57, 59, 62	mpbir2and 959	. . . . . 6 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → (𝑥𝐷𝑦) = 0)
64		meteq0 21954	. . . . . . 7 ⊢ ((𝐷 ∈ (Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → ((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦))
65	26, 27, 28, 64	syl3anc 1318	. . . . . 6 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → ((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦))
66	63, 65	mpbid 221	. . . . 5 ⊢ (((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ ((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦)) → 𝑥 = 𝑦)
67	66	ex 449	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → 𝑥 = 𝑦))
68	67	ralrimivva 2954	. . 3 ⊢ (𝜑 → ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → 𝑥 = 𝑦))
69		fveq2 6103	. . . . . . . 8 ⊢ (𝑥 = 𝑧 → (𝐹‘𝑥) = (𝐹‘𝑧))
70		id 22	. . . . . . . 8 ⊢ (𝑥 = 𝑧 → 𝑥 = 𝑧)
71	69, 70	eqeq12d 2625	. . . . . . 7 ⊢ (𝑥 = 𝑧 → ((𝐹‘𝑥) = 𝑥 ↔ (𝐹‘𝑧) = 𝑧))
72	71	anbi1d 737	. . . . . 6 ⊢ (𝑥 = 𝑧 → (((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) ↔ ((𝐹‘𝑧) = 𝑧 ∧ (𝐹‘𝑦) = 𝑦)))
73		equequ1 1939	. . . . . 6 ⊢ (𝑥 = 𝑧 → (𝑥 = 𝑦 ↔ 𝑧 = 𝑦))
74	72, 73	imbi12d 333	. . . . 5 ⊢ (𝑥 = 𝑧 → ((((𝐹‘𝑥) = 𝑥 ∧ (𝐹‘𝑦) = 𝑦) → 𝑥 = 𝑦) ↔ (((𝐹‘𝑧) = 𝑧 ∧ (𝐹‘𝑦) = 𝑦) → 𝑧 = 𝑦)))
75	74	ralbidv 2969	. . . 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	cbvralv 3147	. . 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 207	. 2 ⊢ (𝜑 → ∀𝑧 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝐹‘𝑧) = 𝑧 ∧ (𝐹‘𝑦) = 𝑦) → 𝑧 = 𝑦))
78		fveq2 6103	. . . 4 ⊢ (𝑧 = 𝑦 → (𝐹‘𝑧) = (𝐹‘𝑦))
79		id 22	. . . 4 ⊢ (𝑧 = 𝑦 → 𝑧 = 𝑦)
80	78, 79	eqeq12d 2625	. . 3 ⊢ (𝑧 = 𝑦 → ((𝐹‘𝑧) = 𝑧 ↔ (𝐹‘𝑦) = 𝑦))
81	80	reu4 3367	. 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 695	1 ⊢ (𝜑 → ∃!𝑧 ∈ 𝑋 (𝐹‘𝑧) = 𝑧)

Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   = wceq 1475  ∃wex 1695   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896  ∃wrex 2897  ∃!wreu 2898  ∅c0 3874  {csn 4125   class class class wbr 4583   × cxp 5036   ∘ ccom 5042  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549  1^st c1st 7057  ℝcr 9814  0cc0 9815  1c1 9816   · cmul 9820   < clt 9953   ≤ cle 9954   − cmin 10145  ℕcn 10897  ℝ⁺crp 11708  seqcseq 12663  Metcme 19553  MetOpencmopn 19557  CMetcms 22860

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-inf2 8421  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892  ax-pre-sup 9893

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-fal 1481  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-se 4998  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-isom 5813  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-oadd 7451  df-er 7629  df-map 7746  df-pm 7747  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-sup 8231  df-inf 8232  df-oi 8298  df-card 8648  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-div 10564  df-nn 10898  df-2 10956  df-3 10957  df-n0 11170  df-z 11255  df-uz 11564  df-q 11665  df-rp 11709  df-xneg 11822  df-xadd 11823  df-xmul 11824  df-ico 12052  df-icc 12053  df-fz 12198  df-fzo 12335  df-fl 12455  df-seq 12664  df-exp 12723  df-hash 12980  df-cj 13687  df-re 13688  df-im 13689  df-sqrt 13823  df-abs 13824  df-clim 14067  df-rlim 14068  df-sum 14265  df-rest 15906  df-topgen 15927  df-psmet 19559  df-xmet 19560  df-met 19561  df-bl 19562  df-mopn 19563  df-fbas 19564  df-fg 19565  df-top 20521  df-bases 20522  df-topon 20523  df-ntr 20634  df-nei 20712  df-lm 20843  df-haus 20929  df-fil 21460  df-fm 21552  df-flim 21553  df-flf 21554  df-cfil 22861  df-cau 22862  df-cmet 22863

This theorem is referenced by: (None)