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Theorem metnrmlem1a 24594

Description: Lemma for metnrm 24598. (Contributed by Mario Carneiro, 14-Jan-2014.) (Revised by Mario Carneiro, 4-Sep-2015.)

**Hypotheses**
Ref	Expression
metdscn.f	⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ inf(ran (𝑦 ∈ 𝑆 ↦ (𝑥𝐷𝑦)), ℝ^*, < ))
metdscn.j	⊢ 𝐽 = (MetOpen‘𝐷)
metnrmlem.1	⊢ (𝜑 → 𝐷 ∈ (∞Met‘𝑋))
metnrmlem.2	⊢ (𝜑 → 𝑆 ∈ (Clsd‘𝐽))
metnrmlem.3	⊢ (𝜑 → 𝑇 ∈ (Clsd‘𝐽))
metnrmlem.4	⊢ (𝜑 → (𝑆 ∩ 𝑇) = ∅)

**Assertion**
Ref	Expression
metnrmlem1a	⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 < (𝐹‘𝐴) ∧ if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ⁺))

Distinct variable groups: 𝑥,𝑦,𝐴 𝑥,𝐷,𝑦 𝑦,𝐽 𝑥,𝑇,𝑦 𝑥,𝑆,𝑦 𝑥,𝑋,𝑦 Allowed substitution hints: 𝜑(𝑥,𝑦) 𝐹(𝑥,𝑦) 𝐽(𝑥)

**Proof of Theorem metnrmlem1a**
Step	Hyp	Ref	Expression
1		metnrmlem.4	. . . . . 6 ⊢ (𝜑 → (𝑆 ∩ 𝑇) = ∅)
2	1	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝑆 ∩ 𝑇) = ∅)
3		inelcm 4463	. . . . . . . 8 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝐴 ∈ 𝑇) → (𝑆 ∩ 𝑇) ≠ ∅)
4	3	expcom 412	. . . . . . 7 ⊢ (𝐴 ∈ 𝑇 → (𝐴 ∈ 𝑆 → (𝑆 ∩ 𝑇) ≠ ∅))
5	4	adantl 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐴 ∈ 𝑆 → (𝑆 ∩ 𝑇) ≠ ∅))
6	5	necon2bd 2954	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ((𝑆 ∩ 𝑇) = ∅ → ¬ 𝐴 ∈ 𝑆))
7	2, 6	mpd 15	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ¬ 𝐴 ∈ 𝑆)
8		eqcom 2737	. . . . . 6 ⊢ (0 = (𝐹‘𝐴) ↔ (𝐹‘𝐴) = 0)
9		metnrmlem.1	. . . . . . . 8 ⊢ (𝜑 → 𝐷 ∈ (∞Met‘𝑋))
10	9	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐷 ∈ (∞Met‘𝑋))
11		metnrmlem.2	. . . . . . . . . 10 ⊢ (𝜑 → 𝑆 ∈ (Clsd‘𝐽))
12	11	adantr 479	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑆 ∈ (Clsd‘𝐽))
13		eqid 2730	. . . . . . . . . 10 ⊢ ∪ 𝐽 = ∪ 𝐽
14	13	cldss 22753	. . . . . . . . 9 ⊢ (𝑆 ∈ (Clsd‘𝐽) → 𝑆 ⊆ ∪ 𝐽)
15	12, 14	syl 17	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑆 ⊆ ∪ 𝐽)
16		metdscn.j	. . . . . . . . . 10 ⊢ 𝐽 = (MetOpen‘𝐷)
17	16	mopnuni 24167	. . . . . . . . 9 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝑋 = ∪ 𝐽)
18	10, 17	syl 17	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑋 = ∪ 𝐽)
19	15, 18	sseqtrrd 4022	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑆 ⊆ 𝑋)
20		metnrmlem.3	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑇 ∈ (Clsd‘𝐽))
21	20	adantr 479	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑇 ∈ (Clsd‘𝐽))
22	13	cldss 22753	. . . . . . . . . 10 ⊢ (𝑇 ∈ (Clsd‘𝐽) → 𝑇 ⊆ ∪ 𝐽)
23	21, 22	syl 17	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑇 ⊆ ∪ 𝐽)
24	23, 18	sseqtrrd 4022	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑇 ⊆ 𝑋)
25		simpr 483	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐴 ∈ 𝑇)
26	24, 25	sseldd 3982	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐴 ∈ 𝑋)
27		metdscn.f	. . . . . . . 8 ⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ inf(ran (𝑦 ∈ 𝑆 ↦ (𝑥𝐷𝑦)), ℝ^*, < ))
28	27, 16	metdseq0 24590	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐹‘𝐴) = 0 ↔ 𝐴 ∈ ((cls‘𝐽)‘𝑆)))
29	10, 19, 26, 28	syl3anc 1369	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ((𝐹‘𝐴) = 0 ↔ 𝐴 ∈ ((cls‘𝐽)‘𝑆)))
30	8, 29	bitrid 282	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 = (𝐹‘𝐴) ↔ 𝐴 ∈ ((cls‘𝐽)‘𝑆)))
31		cldcls 22766	. . . . . . 7 ⊢ (𝑆 ∈ (Clsd‘𝐽) → ((cls‘𝐽)‘𝑆) = 𝑆)
32	12, 31	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ((cls‘𝐽)‘𝑆) = 𝑆)
33	32	eleq2d 2817	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐴 ∈ ((cls‘𝐽)‘𝑆) ↔ 𝐴 ∈ 𝑆))
34	30, 33	bitrd 278	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 = (𝐹‘𝐴) ↔ 𝐴 ∈ 𝑆))
35	7, 34	mtbird 324	. . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ¬ 0 = (𝐹‘𝐴))
36	27	metdsf 24584	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋) → 𝐹:𝑋⟶(0[,]+∞))
37	10, 19, 36	syl2anc 582	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐹:𝑋⟶(0[,]+∞))
38	37, 26	ffvelcdmd 7086	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐹‘𝐴) ∈ (0[,]+∞))
39		elxrge0 13438	. . . . . . 7 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) ↔ ((𝐹‘𝐴) ∈ ℝ^* ∧ 0 ≤ (𝐹‘𝐴)))
40	39	simprbi 495	. . . . . 6 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → 0 ≤ (𝐹‘𝐴))
41	38, 40	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 0 ≤ (𝐹‘𝐴))
42		0xr 11265	. . . . . 6 ⊢ 0 ∈ ℝ^*
43		eliccxr 13416	. . . . . . 7 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → (𝐹‘𝐴) ∈ ℝ^*)
44	38, 43	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐹‘𝐴) ∈ ℝ^*)
45		xrleloe 13127	. . . . . 6 ⊢ ((0 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^*) → (0 ≤ (𝐹‘𝐴) ↔ (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴))))
46	42, 44, 45	sylancr 585	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 ≤ (𝐹‘𝐴) ↔ (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴))))
47	41, 46	mpbid 231	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴)))
48	47	ord 860	. . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (¬ 0 < (𝐹‘𝐴) → 0 = (𝐹‘𝐴)))
49	35, 48	mt3d 148	. 2 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 0 < (𝐹‘𝐴))
50		1xr 11277	. . . . 5 ⊢ 1 ∈ ℝ^*
51		ifcl 4572	. . . . 5 ⊢ ((1 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ^)
52	50, 44, 51	sylancr 585	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ^*)
53		1red 11219	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 1 ∈ ℝ)
54		0lt1 11740	. . . . . 6 ⊢ 0 < 1
55		breq2 5151	. . . . . . 7 ⊢ (1 = if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) → (0 < 1 ↔ 0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴))))
56		breq2 5151	. . . . . . 7 ⊢ ((𝐹‘𝐴) = if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) → (0 < (𝐹‘𝐴) ↔ 0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴))))
57	55, 56	ifboth 4566	. . . . . 6 ⊢ ((0 < 1 ∧ 0 < (𝐹‘𝐴)) → 0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)))
58	54, 49, 57	sylancr 585	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)))
59		xrltle 13132	. . . . . 6 ⊢ ((0 ∈ ℝ^* ∧ if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ^*) → (0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) → 0 ≤ if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴))))
60	42, 52, 59	sylancr 585	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) → 0 ≤ if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴))))
61	58, 60	mpd 15	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 0 ≤ if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)))
62		xrmin1 13160	. . . . 5 ⊢ ((1 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^*) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ≤ 1)
63	50, 44, 62	sylancr 585	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ≤ 1)
64		xrrege0 13157	. . . 4 ⊢ (((if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ^* ∧ 1 ∈ ℝ) ∧ (0 ≤ if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∧ if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ≤ 1)) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ)
65	52, 53, 61, 63, 64	syl22anc 835	. . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ)
66	65, 58	elrpd 13017	. 2 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ⁺)
67	49, 66	jca 510	1 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 < (𝐹‘𝐴) ∧ if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ⁺))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 394 ∨ wo 843 = wceq 1539 ∈ wcel 2104 ≠ wne 2938 ∩ cin 3946 ⊆ wss 3947 ∅c0 4321 ifcif 4527 ∪ cuni 4907 class class class wbr 5147 ↦ cmpt 5230 ran crn 5676 ⟶wf 6538 ‘cfv 6542 (class class class)co 7411 infcinf 9438 ℝcr 11111 0cc0 11112 1c1 11113 +∞cpnf 11249 ℝ^*cxr 11251 < clt 11252 ≤ cle 11253 ℝ⁺crp 12978 [,]cicc 13331 ∞Metcxmet 21129 MetOpencmopn 21134 Clsdccld 22740 clsccl 22742

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 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3474 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-int 4950 df-iun 4998 df-iin 4999 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 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-er 8705 df-map 8824 df-en 8942 df-dom 8943 df-sdom 8944 df-sup 9439 df-inf 9440 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-nn 12217 df-2 12279 df-n0 12477 df-z 12563 df-uz 12827 df-q 12937 df-rp 12979 df-xneg 13096 df-xadd 13097 df-xmul 13098 df-icc 13335 df-topgen 17393 df-psmet 21136 df-xmet 21137 df-bl 21139 df-mopn 21140 df-top 22616 df-topon 22633 df-bases 22669 df-cld 22743 df-ntr 22744 df-cls 22745

This theorem is referenced by: metnrmlem2 24596 metnrmlem3 24597

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