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Theorem metequiv2 24010

Description: If there is a sequence of radii approaching zero for which the balls of both metrics coincide, then the generated topologies are equivalent. (Contributed by Mario Carneiro, 26-Aug-2015.)

**Hypotheses**
Ref	Expression
metequiv.3	⊢ 𝐽 = (MetOpen‘𝐶)
metequiv.4	⊢ 𝐾 = (MetOpen‘𝐷)

**Assertion**
Ref	Expression
metequiv2	⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) → (∀𝑥 ∈ 𝑋 ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)) → 𝐽 = 𝐾))

Distinct variable groups: 𝑠,𝑟,𝑥,𝐶 𝐽,𝑟,𝑠,𝑥 𝐾,𝑟,𝑠,𝑥 𝐷,𝑟,𝑠,𝑥 𝑋,𝑟,𝑠,𝑥

**Proof of Theorem metequiv2**
Step	Hyp	Ref	Expression
1		simprrr 780	. . . . . . . . . . 11 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠))
2		simplll 773	. . . . . . . . . . . 12 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → 𝐶 ∈ (∞Met‘𝑋))
3		simplr 767	. . . . . . . . . . . 12 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → 𝑥 ∈ 𝑋)
4		simprlr 778	. . . . . . . . . . . . 13 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → 𝑠 ∈ ℝ⁺)
5	4	rpxrd 13013	. . . . . . . . . . . 12 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → 𝑠 ∈ ℝ^*)
6		simprll 777	. . . . . . . . . . . . 13 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → 𝑟 ∈ ℝ⁺)
7	6	rpxrd 13013	. . . . . . . . . . . 12 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → 𝑟 ∈ ℝ^*)
8		simprrl 779	. . . . . . . . . . . 12 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → 𝑠 ≤ 𝑟)
9		ssbl 23920	. . . . . . . . . . . 12 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋) ∧ (𝑠 ∈ ℝ^* ∧ 𝑟 ∈ ℝ^*) ∧ 𝑠 ≤ 𝑟) → (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟))
10	2, 3, 5, 7, 8, 9	syl221anc 1381	. . . . . . . . . . 11 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟))
11	1, 10	eqsstrrd 4020	. . . . . . . . . 10 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟))
12		simpllr 774	. . . . . . . . . . . 12 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → 𝐷 ∈ (∞Met‘𝑋))
13		ssbl 23920	. . . . . . . . . . . 12 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋) ∧ (𝑠 ∈ ℝ^* ∧ 𝑟 ∈ ℝ^*) ∧ 𝑠 ≤ 𝑟) → (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))
14	12, 3, 5, 7, 8, 13	syl221anc 1381	. . . . . . . . . . 11 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))
15	1, 14	eqsstrd 4019	. . . . . . . . . 10 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))
16	11, 15	jca 512	. . . . . . . . 9 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ ((𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺) ∧ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)))) → ((𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟)))
17	16	expr 457	. . . . . . . 8 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ (𝑟 ∈ ℝ⁺ ∧ 𝑠 ∈ ℝ⁺)) → ((𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)) → ((𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))))
18	17	anassrs 468	. . . . . . 7 ⊢ (((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ 𝑟 ∈ ℝ⁺) ∧ 𝑠 ∈ ℝ⁺) → ((𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)) → ((𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))))
19	18	reximdva 3168	. . . . . 6 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ 𝑟 ∈ ℝ⁺) → (∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)) → ∃𝑠 ∈ ℝ⁺ ((𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))))
20		r19.40 3119	. . . . . 6 ⊢ (∃𝑠 ∈ ℝ⁺ ((𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟)) → (∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟)))
21	19, 20	syl6 35	. . . . 5 ⊢ ((((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) ∧ 𝑟 ∈ ℝ⁺) → (∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)) → (∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))))
22	21	ralimdva 3167	. . . 4 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) → (∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)) → ∀𝑟 ∈ ℝ⁺ (∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))))
23		r19.26 3111	. . . 4 ⊢ (∀𝑟 ∈ ℝ⁺ (∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟)) ↔ (∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟)))
24	22, 23	imbitrdi 250	. . 3 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) ∧ 𝑥 ∈ 𝑋) → (∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)) → (∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))))
25	24	ralimdva 3167	. 2 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) → (∀𝑥 ∈ 𝑋 ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)) → ∀𝑥 ∈ 𝑋 (∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))))
26		metequiv.3	. . 3 ⊢ 𝐽 = (MetOpen‘𝐶)
27		metequiv.4	. . 3 ⊢ 𝐾 = (MetOpen‘𝐷)
28	26, 27	metequiv 24009	. 2 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) → (𝐽 = 𝐾 ↔ ∀𝑥 ∈ 𝑋 (∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐷)𝑠) ⊆ (𝑥(ball‘𝐶)𝑟) ∧ ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑥(ball‘𝐶)𝑠) ⊆ (𝑥(ball‘𝐷)𝑟))))
29	25, 28	sylibrd 258	1 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝐷 ∈ (∞Met‘𝑋)) → (∀𝑥 ∈ 𝑋 ∀𝑟 ∈ ℝ⁺ ∃𝑠 ∈ ℝ⁺ (𝑠 ≤ 𝑟 ∧ (𝑥(ball‘𝐶)𝑠) = (𝑥(ball‘𝐷)𝑠)) → 𝐽 = 𝐾))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ∀wral 3061 ∃wrex 3070 ⊆ wss 3947 class class class wbr 5147 ‘cfv 6540 (class class class)co 7405 ℝ^*cxr 11243 ≤ cle 11245 ℝ⁺crp 12970 ∞Metcxmet 20921 ballcbl 20923 MetOpencmopn 20926

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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-er 8699 df-map 8818 df-en 8936 df-dom 8937 df-sdom 8938 df-sup 9433 df-inf 9434 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-n0 12469 df-z 12555 df-uz 12819 df-q 12929 df-rp 12971 df-xneg 13088 df-xadd 13089 df-xmul 13090 df-topgen 17385 df-psmet 20928 df-xmet 20929 df-bl 20931 df-mopn 20932 df-bases 22440

This theorem is referenced by: stdbdmopn 24018

W3C validator