Theorem metdsge 22460

Description: The distance from the point 𝐴 to the set 𝑆 is greater than 𝑅 iff the 𝑅-ball around 𝐴 misses 𝑆. (Contributed by Mario Carneiro, 4-Sep-2015.) (Proof shortened by AV, 30-Sep-2020.)

Hypothesis

Ref	Expression
metdscn.f	⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ inf(ran (𝑦 ∈ 𝑆 ↦ (𝑥𝐷𝑦)), ℝ*, < ))

Assertion

Ref	Expression
metdsge	⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → (𝑅 ≤ (𝐹‘𝐴) ↔ (𝑆 ∩ (𝐴(ball‘𝐷)𝑅)) = ∅))

Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐷,𝑦   𝑥,𝑆,𝑦   𝑥,𝑋,𝑦

Allowed substitution hints:   𝑅(𝑥,𝑦)   𝐹(𝑥,𝑦)

Proof of Theorem metdsge

Dummy variables 𝑤 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpl3 1059	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → 𝐴 ∈ 𝑋)
2		metdscn.f	. . . . 5 ⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ inf(ran (𝑦 ∈ 𝑆 ↦ (𝑥𝐷𝑦)), ℝ*, < ))
3	2	metdsval 22458	. . . 4 ⊢ (𝐴 ∈ 𝑋 → (𝐹‘𝐴) = inf(ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)), ℝ*, < ))
4	1, 3	syl 17	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → (𝐹‘𝐴) = inf(ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)), ℝ*, < ))
5	4	breq2d 4595	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → (𝑅 ≤ (𝐹‘𝐴) ↔ 𝑅 ≤ inf(ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)), ℝ*, < )))
6		simpll1 1093	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) ∧ 𝑤 ∈ 𝑆) → 𝐷 ∈ (∞Met‘𝑋))
7	1	adantr 480	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) ∧ 𝑤 ∈ 𝑆) → 𝐴 ∈ 𝑋)
8		simpl2 1058	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → 𝑆 ⊆ 𝑋)
9	8	sselda 3568	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) ∧ 𝑤 ∈ 𝑆) → 𝑤 ∈ 𝑋)
10		xmetcl 21946	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐴 ∈ 𝑋 ∧ 𝑤 ∈ 𝑋) → (𝐴𝐷𝑤) ∈ ℝ*)
11	6, 7, 9, 10	syl3anc 1318	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) ∧ 𝑤 ∈ 𝑆) → (𝐴𝐷𝑤) ∈ ℝ*)
12		oveq2 6557	. . . . . 6 ⊢ (𝑦 = 𝑤 → (𝐴𝐷𝑦) = (𝐴𝐷𝑤))
13	12	cbvmptv 4678	. . . . 5 ⊢ (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)) = (𝑤 ∈ 𝑆 ↦ (𝐴𝐷𝑤))
14	11, 13	fmptd 6292	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)):𝑆⟶ℝ*)
15		frn 5966	. . . 4 ⊢ ((𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)):𝑆⟶ℝ* → ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)) ⊆ ℝ*)
16	14, 15	syl 17	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)) ⊆ ℝ*)
17		simpr 476	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → 𝑅 ∈ ℝ*)
18		infxrgelb 12037	. . 3 ⊢ ((ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)) ⊆ ℝ* ∧ 𝑅 ∈ ℝ*) → (𝑅 ≤ inf(ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)), ℝ*, < ) ↔ ∀𝑧 ∈ ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦))𝑅 ≤ 𝑧))
19	16, 17, 18	syl2anc 691	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → (𝑅 ≤ inf(ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦)), ℝ*, < ) ↔ ∀𝑧 ∈ ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦))𝑅 ≤ 𝑧))
20	17	adantr 480	. . . . . . 7 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) ∧ 𝑤 ∈ 𝑆) → 𝑅 ∈ ℝ*)
21		elbl2 22005	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑅 ∈ ℝ*) ∧ (𝐴 ∈ 𝑋 ∧ 𝑤 ∈ 𝑋)) → (𝑤 ∈ (𝐴(ball‘𝐷)𝑅) ↔ (𝐴𝐷𝑤) < 𝑅))
22	6, 20, 7, 9, 21	syl22anc 1319	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) ∧ 𝑤 ∈ 𝑆) → (𝑤 ∈ (𝐴(ball‘𝐷)𝑅) ↔ (𝐴𝐷𝑤) < 𝑅))
23		xrltnle 9984	. . . . . . 7 ⊢ (((𝐴𝐷𝑤) ∈ ℝ* ∧ 𝑅 ∈ ℝ*) → ((𝐴𝐷𝑤) < 𝑅 ↔ ¬ 𝑅 ≤ (𝐴𝐷𝑤)))
24	11, 20, 23	syl2anc 691	. . . . . 6 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) ∧ 𝑤 ∈ 𝑆) → ((𝐴𝐷𝑤) < 𝑅 ↔ ¬ 𝑅 ≤ (𝐴𝐷𝑤)))
25	22, 24	bitrd 267	. . . . 5 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) ∧ 𝑤 ∈ 𝑆) → (𝑤 ∈ (𝐴(ball‘𝐷)𝑅) ↔ ¬ 𝑅 ≤ (𝐴𝐷𝑤)))
26	25	con2bid 343	. . . 4 ⊢ ((((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) ∧ 𝑤 ∈ 𝑆) → (𝑅 ≤ (𝐴𝐷𝑤) ↔ ¬ 𝑤 ∈ (𝐴(ball‘𝐷)𝑅)))
27	26	ralbidva 2968	. . 3 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → (∀𝑤 ∈ 𝑆 𝑅 ≤ (𝐴𝐷𝑤) ↔ ∀𝑤 ∈ 𝑆 ¬ 𝑤 ∈ (𝐴(ball‘𝐷)𝑅)))
28		ovex 6577	. . . . 5 ⊢ (𝐴𝐷𝑤) ∈ V
29	28	rgenw 2908	. . . 4 ⊢ ∀𝑤 ∈ 𝑆 (𝐴𝐷𝑤) ∈ V
30		breq2 4587	. . . . 5 ⊢ (𝑧 = (𝐴𝐷𝑤) → (𝑅 ≤ 𝑧 ↔ 𝑅 ≤ (𝐴𝐷𝑤)))
31	13, 30	ralrnmpt 6276	. . . 4 ⊢ (∀𝑤 ∈ 𝑆 (𝐴𝐷𝑤) ∈ V → (∀𝑧 ∈ ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦))𝑅 ≤ 𝑧 ↔ ∀𝑤 ∈ 𝑆 𝑅 ≤ (𝐴𝐷𝑤)))
32	29, 31	ax-mp 5	. . 3 ⊢ (∀𝑧 ∈ ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦))𝑅 ≤ 𝑧 ↔ ∀𝑤 ∈ 𝑆 𝑅 ≤ (𝐴𝐷𝑤))
33		disj 3969	. . 3 ⊢ ((𝑆 ∩ (𝐴(ball‘𝐷)𝑅)) = ∅ ↔ ∀𝑤 ∈ 𝑆 ¬ 𝑤 ∈ (𝐴(ball‘𝐷)𝑅))
34	27, 32, 33	3bitr4g 302	. 2 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → (∀𝑧 ∈ ran (𝑦 ∈ 𝑆 ↦ (𝐴𝐷𝑦))𝑅 ≤ 𝑧 ↔ (𝑆 ∩ (𝐴(ball‘𝐷)𝑅)) = ∅))
35	5, 19, 34	3bitrd 293	1 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) ∧ 𝑅 ∈ ℝ*) → (𝑅 ≤ (𝐹‘𝐴) ↔ (𝑆 ∩ (𝐴(ball‘𝐷)𝑅)) = ∅))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  ∀wral 2896  Vcvv 3173   ∩ cin 3539   ⊆ wss 3540  ∅c0 3874   class class class wbr 4583   ↦ cmpt 4643  ran crn 5039  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549  infcinf 8230  ℝ^*cxr 9952   < clt 9953   ≤ cle 9954  ∞Metcxmt 19552  ballcbl 19554

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892  ax-pre-sup 9893

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-po 4959  df-so 4960  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-1st 7059  df-2nd 7060  df-er 7629  df-map 7746  df-en 7842  df-dom 7843  df-sdom 7844  df-sup 8231  df-inf 8232  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-psmet 19559  df-xmet 19560  df-bl 19562

This theorem is referenced by:  metds0  22461  metdstri  22462  metdseq0  22465  lebnumlem3  22570