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Theorem stdbdmopn 24531

Description: The standard bounded metric corresponding to 𝐶 generates the same topology as 𝐶. (Contributed by Mario Carneiro, 26-Aug-2015.)

**Hypotheses**
Ref	Expression
stdbdmet.1	⊢ 𝐷 = (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ if((𝑥𝐶𝑦) ≤ 𝑅, (𝑥𝐶𝑦), 𝑅))
stdbdmopn.2	⊢ 𝐽 = (MetOpen‘𝐶)

**Assertion**
Ref	Expression
stdbdmopn	⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) → 𝐽 = (MetOpen‘𝐷))

Distinct variable groups: 𝑥,𝑦,𝐶 𝑥,𝑅,𝑦 𝑥,𝑋,𝑦 Allowed substitution hints: 𝐷(𝑥,𝑦) 𝐽(𝑥,𝑦)

Proof of Theorem stdbdmopn Dummy variables 𝑟 𝑠 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		rpxr 13044	. . . . . . . 8 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ^*)
2	1	ad2antll 729	. . . . . . 7 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → 𝑟 ∈ ℝ^*)
3		simpl2 1193	. . . . . . 7 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → 𝑅 ∈ ℝ^*)
4	2, 3	ifcld 4572	. . . . . 6 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ^*)
5		rpre 13043	. . . . . . 7 ⊢ (𝑟 ∈ ℝ⁺ → 𝑟 ∈ ℝ)
6	5	ad2antll 729	. . . . . 6 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → 𝑟 ∈ ℝ)
7		rpgt0 13047	. . . . . . . . 9 ⊢ (𝑟 ∈ ℝ⁺ → 0 < 𝑟)
8	7	ad2antll 729	. . . . . . . 8 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → 0 < 𝑟)
9		simpl3 1194	. . . . . . . 8 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → 0 < 𝑅)
10		breq2 5147	. . . . . . . . 9 ⊢ (𝑟 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (0 < 𝑟 ↔ 0 < if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
11		breq2 5147	. . . . . . . . 9 ⊢ (𝑅 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (0 < 𝑅 ↔ 0 < if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
12	10, 11	ifboth 4565	. . . . . . . 8 ⊢ ((0 < 𝑟 ∧ 0 < 𝑅) → 0 < if(𝑟 ≤ 𝑅, 𝑟, 𝑅))
13	8, 9, 12	syl2anc 584	. . . . . . 7 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → 0 < if(𝑟 ≤ 𝑅, 𝑟, 𝑅))
14		0xr 11308	. . . . . . . 8 ⊢ 0 ∈ ℝ^*
15		xrltle 13191	. . . . . . . 8 ⊢ ((0 ∈ ℝ^* ∧ if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ^*) → (0 < if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → 0 ≤ if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
16	14, 4, 15	sylancr 587	. . . . . . 7 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → (0 < if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → 0 ≤ if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
17	13, 16	mpd 15	. . . . . 6 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → 0 ≤ if(𝑟 ≤ 𝑅, 𝑟, 𝑅))
18		xrmin1 13219	. . . . . . 7 ⊢ ((𝑟 ∈ ℝ^* ∧ 𝑅 ∈ ℝ^*) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑟)
19	2, 3, 18	syl2anc 584	. . . . . 6 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑟)
20		xrrege0 13216	. . . . . 6 ⊢ (((if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ^* ∧ 𝑟 ∈ ℝ) ∧ (0 ≤ if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∧ if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑟)) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ)
21	4, 6, 17, 19, 20	syl22anc 839	. . . . 5 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ)
22	21, 13	elrpd 13074	. . . 4 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ⁺)
23		simprl 771	. . . . . . 7 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → 𝑧 ∈ 𝑋)
24		xrmin2 13220	. . . . . . . 8 ⊢ ((𝑟 ∈ ℝ^* ∧ 𝑅 ∈ ℝ^*) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑅)
25	2, 3, 24	syl2anc 584	. . . . . . 7 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑅)
26	23, 4, 25	3jca 1129	. . . . . 6 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → (𝑧 ∈ 𝑋 ∧ if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ^* ∧ if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑅))
27		stdbdmet.1	. . . . . . 7 ⊢ 𝐷 = (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ if((𝑥𝐶𝑦) ≤ 𝑅, (𝑥𝐶𝑦), 𝑅))
28	27	stdbdbl 24530	. . . . . 6 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ^* ∧ if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑅)) → (𝑧(ball‘𝐷)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)) = (𝑧(ball‘𝐶)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
29	26, 28	syldan 591	. . . . 5 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → (𝑧(ball‘𝐷)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)) = (𝑧(ball‘𝐶)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
30	29	eqcomd 2743	. . . 4 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → (𝑧(ball‘𝐶)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)) = (𝑧(ball‘𝐷)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
31		breq1 5146	. . . . . 6 ⊢ (𝑠 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (𝑠 ≤ 𝑟 ↔ if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑟))
32		oveq2 7439	. . . . . . 7 ⊢ (𝑠 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (𝑧(ball‘𝐶)𝑠) = (𝑧(ball‘𝐶)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
33		oveq2 7439	. . . . . . 7 ⊢ (𝑠 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (𝑧(ball‘𝐷)𝑠) = (𝑧(ball‘𝐷)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
34	32, 33	eqeq12d 2753	. . . . . 6 ⊢ (𝑠 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → ((𝑧(ball‘𝐶)𝑠) = (𝑧(ball‘𝐷)𝑠) ↔ (𝑧(ball‘𝐶)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)) = (𝑧(ball‘𝐷)if(𝑟 ≤ 𝑅, 𝑟, 𝑅))))
35	31, 34	anbi12d 632	. . . . 5 ⊢ (𝑠 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → ((𝑠 ≤ 𝑟 ∧ (𝑧(ball‘𝐶)𝑠) = (𝑧(ball‘𝐷)𝑠)) ↔ (if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑟 ∧ (𝑧(ball‘𝐶)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)) = (𝑧(ball‘𝐷)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))))
36	35	rspcev 3622	. . . 4 ⊢ ((if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ⁺ ∧ (if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑟 ∧ (𝑧(ball‘𝐶)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)) = (𝑧(ball‘𝐷)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))) → ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑧(ball‘𝐶)𝑠) = (𝑧(ball‘𝐷)𝑠)))
37	22, 19, 30, 36	syl12anc 837	. . 3 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑧(ball‘𝐶)𝑠) = (𝑧(ball‘𝐷)𝑠)))
38	37	ralrimivva 3202	. 2 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) → ∀𝑧 ∈ 𝑋 ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑧(ball‘𝐶)𝑠) = (𝑧(ball‘𝐷)𝑠)))
39		simp1 1137	. . 3 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) → 𝐶 ∈ (∞Met‘𝑋))
40	27	stdbdxmet 24528	. . 3 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) → 𝐷 ∈ (∞Met‘𝑋))
41		stdbdmopn.2	. . . 4 ⊢ 𝐽 = (MetOpen‘𝐶)
42		eqid 2737	. . . 4 ⊢ (MetOpen‘𝐷) = (MetOpen‘𝐷)
43	41, 42	metequiv2 24523	. . 3 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) → (∀𝑧 ∈ 𝑋 ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑧(ball‘𝐶)𝑠) = (𝑧(ball‘𝐷)𝑠)) → 𝐽 = (MetOpen‘𝐷)))
44	39, 40, 43	syl2anc 584	. 2 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) → (∀𝑧 ∈ 𝑋 ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑧(ball‘𝐶)𝑠) = (𝑧(ball‘𝐷)𝑠)) → 𝐽 = (MetOpen‘𝐷)))
45	38, 44	mpd 15	1 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) → 𝐽 = (MetOpen‘𝐷))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1087 = wceq 1540 ∈ wcel 2108 ∀wral 3061 ∃wrex 3070 ifcif 4525 class class class wbr 5143 ‘cfv 6561 (class class class)co 7431 ∈ cmpo 7433 ℝcr 11154 0cc0 11155 ℝ^*cxr 11294 < clt 11295 ≤ cle 11296 ℝ⁺crp 13034 ∞Metcxmet 21349 ballcbl 21351 MetOpencmopn 21354

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 ax-cnex 11211 ax-resscn 11212 ax-1cn 11213 ax-icn 11214 ax-addcl 11215 ax-addrcl 11216 ax-mulcl 11217 ax-mulrcl 11218 ax-mulcom 11219 ax-addass 11220 ax-mulass 11221 ax-distr 11222 ax-i2m1 11223 ax-1ne0 11224 ax-1rid 11225 ax-rnegex 11226 ax-rrecex 11227 ax-cnre 11228 ax-pre-lttri 11229 ax-pre-lttrn 11230 ax-pre-ltadd 11231 ax-pre-mulgt0 11232 ax-pre-sup 11233

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3380 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-1st 8014 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-er 8745 df-map 8868 df-en 8986 df-dom 8987 df-sdom 8988 df-sup 9482 df-inf 9483 df-pnf 11297 df-mnf 11298 df-xr 11299 df-ltxr 11300 df-le 11301 df-sub 11494 df-neg 11495 df-div 11921 df-nn 12267 df-2 12329 df-n0 12527 df-z 12614 df-uz 12879 df-q 12991 df-rp 13035 df-xneg 13154 df-xadd 13155 df-xmul 13156 df-icc 13394 df-topgen 17488 df-psmet 21356 df-xmet 21357 df-bl 21359 df-mopn 21360 df-bases 22953

This theorem is referenced by: mopnex 24532 xlebnum 24997

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