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Theorem stdbdmopn 24422

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 12921	. . . . . . . 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 4525	. . . . . 6 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ^*)
5		rpre 12920	. . . . . . 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 12924	. . . . . . . . 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 5099	. . . . . . . . 9 ⊢ (𝑟 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (0 < 𝑟 ↔ 0 < if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
11		breq2 5099	. . . . . . . . 9 ⊢ (𝑅 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (0 < 𝑅 ↔ 0 < if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
12	10, 11	ifboth 4518	. . . . . . . 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 11181	. . . . . . . 8 ⊢ 0 ∈ ℝ^*
15		xrltle 13069	. . . . . . . 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 13097	. . . . . . 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 13094	. . . . . 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 838	. . . . 5 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ)
22	21, 13	elrpd 12952	. . . 4 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ∈ ℝ⁺)
23		simprl 770	. . . . . . 7 ⊢ (((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) ∧ (𝑧 ∈ 𝑋 ∧ 𝑟 ∈ ℝ⁺)) → 𝑧 ∈ 𝑋)
24		xrmin2 13098	. . . . . . . 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 1128	. . . . . 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 24421	. . . . . 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 2735	. . . 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 5098	. . . . . 6 ⊢ (𝑠 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (𝑠 ≤ 𝑟 ↔ if(𝑟 ≤ 𝑅, 𝑟, 𝑅) ≤ 𝑟))
32		oveq2 7361	. . . . . . 7 ⊢ (𝑠 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (𝑧(ball‘𝐶)𝑠) = (𝑧(ball‘𝐶)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
33		oveq2 7361	. . . . . . 7 ⊢ (𝑠 = if(𝑟 ≤ 𝑅, 𝑟, 𝑅) → (𝑧(ball‘𝐷)𝑠) = (𝑧(ball‘𝐷)if(𝑟 ≤ 𝑅, 𝑟, 𝑅)))
34	32, 33	eqeq12d 2745	. . . . . 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 3579	. . . 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 836	. . 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 3172	. 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 1136	. . 3 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) → 𝐶 ∈ (∞Met‘𝑋))
40	27	stdbdxmet 24419	. . 3 ⊢ ((𝐶 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ^* ∧ 0 < 𝑅) → 𝐷 ∈ (∞Met‘𝑋))
41		stdbdmopn.2	. . . 4 ⊢ 𝐽 = (MetOpen‘𝐶)
42		eqid 2729	. . . 4 ⊢ (MetOpen‘𝐷) = (MetOpen‘𝐷)
43	41, 42	metequiv2 24414	. . 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 1086 = wceq 1540 ∈ wcel 2109 ∀wral 3044 ∃wrex 3053 ifcif 4478 class class class wbr 5095 ‘cfv 6486 (class class class)co 7353 ∈ cmpo 7355 ℝcr 11027 0cc0 11028 ℝ^*cxr 11167 < clt 11168 ≤ cle 11169 ℝ⁺crp 12911 ∞Metcxmet 21264 ballcbl 21266 MetOpencmopn 21269

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 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7675 ax-cnex 11084 ax-resscn 11085 ax-1cn 11086 ax-icn 11087 ax-addcl 11088 ax-addrcl 11089 ax-mulcl 11090 ax-mulrcl 11091 ax-mulcom 11092 ax-addass 11093 ax-mulass 11094 ax-distr 11095 ax-i2m1 11096 ax-1ne0 11097 ax-1rid 11098 ax-rnegex 11099 ax-rrecex 11100 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 ax-pre-ltadd 11104 ax-pre-mulgt0 11105 ax-pre-sup 11106

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3345 df-reu 3346 df-rab 3397 df-v 3440 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4862 df-iun 4946 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5518 df-eprel 5523 df-po 5531 df-so 5532 df-fr 5576 df-we 5578 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-pred 6253 df-ord 6314 df-on 6315 df-lim 6316 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-riota 7310 df-ov 7356 df-oprab 7357 df-mpo 7358 df-om 7807 df-1st 7931 df-2nd 7932 df-frecs 8221 df-wrecs 8252 df-recs 8301 df-rdg 8339 df-er 8632 df-map 8762 df-en 8880 df-dom 8881 df-sdom 8882 df-sup 9351 df-inf 9352 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11367 df-neg 11368 df-div 11796 df-nn 12147 df-2 12209 df-n0 12403 df-z 12490 df-uz 12754 df-q 12868 df-rp 12912 df-xneg 13032 df-xadd 13033 df-xmul 13034 df-icc 13273 df-topgen 17365 df-psmet 21271 df-xmet 21272 df-bl 21274 df-mopn 21275 df-bases 22849

This theorem is referenced by: mopnex 24423 xlebnum 24880

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