blsscls2 - Metamath Proof Explorer

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Theorem blsscls2 23117

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 22944	. . . . . . . 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 12552	. . . . . . . 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 23003	. . . . . . . 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 3185	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑃 ∈ 𝑋) ∧ (𝑅 ∈ ℝ^* ∧ 𝑇 ∈ ℝ^* ∧ 𝑅 < 𝑇)) → ∀𝑧 ∈ 𝑋 ((𝑃𝐷𝑧) ≤ 𝑅 → 𝑧 ∈ (𝑃(ball‘𝐷)𝑇)))
18		rabss 4051	. . 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 4018	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 1536 ∈ wcel 2113 ∀wral 3141 {crab 3145 ⊆ wss 3939 class class class wbr 5069 ‘cfv 6358 (class class class)co 7159 ℝ^*cxr 10677 < clt 10678 ≤ cle 10679 ∞Metcxmet 20533 ballcbl 20535 MetOpencmopn 20538

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 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-sep 5206 ax-nul 5213 ax-pow 5269 ax-pr 5333 ax-un 7464 ax-cnex 10596 ax-resscn 10597 ax-pre-lttri 10614 ax-pre-lttrn 10615

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ne 3020 df-nel 3127 df-ral 3146 df-rex 3147 df-rab 3150 df-v 3499 df-sbc 3776 df-csb 3887 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-nul 4295 df-if 4471 df-pw 4544 df-sn 4571 df-pr 4573 df-op 4577 df-uni 4842 df-iun 4924 df-br 5070 df-opab 5132 df-mpt 5150 df-id 5463 df-po 5477 df-so 5478 df-xp 5564 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-rn 5569 df-res 5570 df-ima 5571 df-iota 6317 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-ov 7162 df-oprab 7163 df-mpo 7164 df-1st 7692 df-2nd 7693 df-er 8292 df-map 8411 df-en 8513 df-dom 8514 df-sdom 8515 df-pnf 10680 df-mnf 10681 df-xr 10682 df-ltxr 10683 df-le 10684 df-psmet 20540 df-xmet 20541 df-bl 20543

This theorem is referenced by: blcld 23118 blsscls 23120 ubthlem1 28650

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