blsscls2 - Metamath Proof Explorer

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Theorem blsscls2 23108

Description: A smaller closed ball is contained in a larger open ball. (Contributed by Mario Carneiro, 10-Jan-2014.)

**Hypotheses**
Ref	Expression
mopni.1	⊢ 𝐽 = (MetOpen‘𝐷)
blcld.3	⊢ 𝑆 = {𝑧 ∈ 𝑋 ∣ (𝑃𝐷𝑧) ≤ 𝑅}

**Assertion**
Ref	Expression
blsscls2	⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) → 𝑆 ⊆ (𝑃(ball‘𝐷)𝑇))

Distinct variable groups: 𝑧,𝐷 𝑧,𝑅 𝑧,𝑃 𝑧,𝑇 𝑧,𝑋 Allowed substitution hints: 𝑆(𝑧) 𝐽(𝑧)

**Proof of Theorem blsscls2**
Step	Hyp	Ref	Expression
1		blcld.3	. 2 ⊢ 𝑆 = {𝑧 ∈ 𝑋 ∣ (𝑃𝐷𝑧) ≤ 𝑅}
2		simplr3 1213	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) ∧ 𝑧 ∈ 𝑋) → 𝑅 < 𝑇)
3		xmetcl 22935	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋) → (𝑃𝐷𝑧) ∈ ℝ^*)
4	3	ad4ant124 1169	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) ∧ 𝑧 ∈ 𝑋) → (𝑃𝐷𝑧) ∈ ℝ^*)
5		simplr1 1211	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) ∧ 𝑧 ∈ 𝑋) → 𝑅 ∈ ℝ^*)
6		simplr2 1212	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) ∧ 𝑧 ∈ 𝑋) → 𝑇 ∈ ℝ^*)
7		xrlelttr 12543	. . . . . . . 8 ⊢ (((𝑃𝐷𝑧) ∈ ℝ^* ∧ 𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^*) → (((𝑃𝐷𝑧) ≤ 𝑅 ∧ 𝑅 < 𝑇) → (𝑃𝐷𝑧) < 𝑇))
8	7	expcomd 419	. . . . . . 7 ⊢ (((𝑃𝐷𝑧) ∈ ℝ^* ∧ 𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^*) → (𝑅 < 𝑇 → ((𝑃𝐷𝑧) ≤ 𝑅 → (𝑃𝐷𝑧) < 𝑇)))
9	4, 5, 6, 8	syl3anc 1367	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) ∧ 𝑧 ∈ 𝑋) → (𝑅 < 𝑇 → ((𝑃𝐷𝑧) ≤ 𝑅 → (𝑃𝐷𝑧) < 𝑇)))
10	2, 9	mpd 15	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) ∧ 𝑧 ∈ 𝑋) → ((𝑃𝐷𝑧) ≤ 𝑅 → (𝑃𝐷𝑧) < 𝑇))
11		simp2 1133	. . . . . . 7 ⊢ ((𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇) → 𝑇 ∈ ℝ^*)
12		elbl2 22994	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑇 ∈ ℝ^*) ∧ (𝑃 ∈ 𝑋 ∧ 𝑧 ∈ 𝑋)) → (𝑧 ∈ (𝑃(ball‘𝐷)𝑇) ↔ (𝑃𝐷𝑧) < 𝑇))
13	12	an4s 658	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑇 ∈ ℝ^* ∧ 𝑧 ∈ 𝑋)) → (𝑧 ∈ (𝑃(ball‘𝐷)𝑇) ↔ (𝑃𝐷𝑧) < 𝑇))
14	11, 13	sylanr1 680	. . . . . 6 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ ((𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇) ∧ 𝑧 ∈ 𝑋)) → (𝑧 ∈ (𝑃(ball‘𝐷)𝑇) ↔ (𝑃𝐷𝑧) < 𝑇))
15	14	anassrs 470	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) ∧ 𝑧 ∈ 𝑋) → (𝑧 ∈ (𝑃(ball‘𝐷)𝑇) ↔ (𝑃𝐷𝑧) < 𝑇))
16	10, 15	sylibrd 261	. . . 4 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) ∧ 𝑧 ∈ 𝑋) → ((𝑃𝐷𝑧) ≤ 𝑅 → 𝑧 ∈ (𝑃(ball‘𝐷)𝑇)))
17	16	ralrimiva 3182	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) → ∀𝑧 ∈ 𝑋 ((𝑃𝐷𝑧) ≤ 𝑅 → 𝑧 ∈ (𝑃(ball‘𝐷)𝑇)))
18		rabss 4047	. . 3 ⊢ ({𝑧 ∈ 𝑋 ∣ (𝑃𝐷𝑧) ≤ 𝑅} ⊆ (𝑃(ball‘𝐷)𝑇) ↔ ∀𝑧 ∈ 𝑋 ((𝑃𝐷𝑧) ≤ 𝑅 → 𝑧 ∈ (𝑃(ball‘𝐷)𝑇)))
19	17, 18	sylibr 236	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) → {𝑧 ∈ 𝑋 ∣ (𝑃𝐷𝑧) ≤ 𝑅} ⊆ (𝑃(ball‘𝐷)𝑇))
20	1, 19	eqsstrid 4014	1 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) → 𝑆 ⊆ (𝑃(ball‘𝐷)𝑇))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1533 ∈ wcel 2110 ∀wral 3138 {crab 3142 ⊆ wss 3935 class class class wbr 5058 ‘cfv 6349 (class class class)co 7150 ℝ^*cxr 10668 < clt 10669 ≤ cle 10670 ∞Metcxmet 20524 ballcbl 20526 MetOpencmopn 20529

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-cnex 10587 ax-resscn 10588 ax-pre-lttri 10605 ax-pre-lttrn 10606

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-iun 4913 df-br 5059 df-opab 5121 df-mpt 5139 df-id 5454 df-po 5468 df-so 5469 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-ov 7153 df-oprab 7154 df-mpo 7155 df-1st 7683 df-2nd 7684 df-er 8283 df-map 8402 df-en 8504 df-dom 8505 df-sdom 8506 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-psmet 20531 df-xmet 20532 df-bl 20534

This theorem is referenced by: blcld 23109 blsscls 23111 ubthlem1 28641

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