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Theorem metnrmlem1a 24374

Description: Lemma for metnrm 24378. (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 482	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝑆 ∩ 𝑇) = ∅)
3		inelcm 4465	. . . . . . . 8 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝐴 ∈ 𝑇) → (𝑆 ∩ 𝑇) ≠ ∅)
4	3	expcom 415	. . . . . . 7 ⊢ (𝐴 ∈ 𝑇 → (𝐴 ∈ 𝑆 → (𝑆 ∩ 𝑇) ≠ ∅))
5	4	adantl 483	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐴 ∈ 𝑆 → (𝑆 ∩ 𝑇) ≠ ∅))
6	5	necon2bd 2957	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ((𝑆 ∩ 𝑇) = ∅ → ¬ 𝐴 ∈ 𝑆))
7	2, 6	mpd 15	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ¬ 𝐴 ∈ 𝑆)
8		eqcom 2740	. . . . . 6 ⊢ (0 = (𝐹‘𝐴) ↔ (𝐹‘𝐴) = 0)
9		metnrmlem.1	. . . . . . . 8 ⊢ (𝜑 → 𝐷 ∈ (∞Met‘𝑋))
10	9	adantr 482	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐷 ∈ (∞Met‘𝑋))
11		metnrmlem.2	. . . . . . . . . 10 ⊢ (𝜑 → 𝑆 ∈ (Clsd‘𝐽))
12	11	adantr 482	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑆 ∈ (Clsd‘𝐽))
13		eqid 2733	. . . . . . . . . 10 ⊢ ∪ 𝐽 = ∪ 𝐽
14	13	cldss 22533	. . . . . . . . 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 23947	. . . . . . . . 9 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝑋 = ∪ 𝐽)
18	10, 17	syl 17	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑋 = ∪ 𝐽)
19	15, 18	sseqtrrd 4024	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑆 ⊆ 𝑋)
20		metnrmlem.3	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑇 ∈ (Clsd‘𝐽))
21	20	adantr 482	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑇 ∈ (Clsd‘𝐽))
22	13	cldss 22533	. . . . . . . . . 10 ⊢ (𝑇 ∈ (Clsd‘𝐽) → 𝑇 ⊆ ∪ 𝐽)
23	21, 22	syl 17	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑇 ⊆ ∪ 𝐽)
24	23, 18	sseqtrrd 4024	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑇 ⊆ 𝑋)
25		simpr 486	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐴 ∈ 𝑇)
26	24, 25	sseldd 3984	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐴 ∈ 𝑋)
27		metdscn.f	. . . . . . . 8 ⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ inf(ran (𝑦 ∈ 𝑆 ↦ (𝑥𝐷𝑦)), ℝ^*, < ))
28	27, 16	metdseq0 24370	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋 ∧ 𝐴 ∈ 𝑋) → ((𝐹‘𝐴) = 0 ↔ 𝐴 ∈ ((cls‘𝐽)‘𝑆)))
29	10, 19, 26, 28	syl3anc 1372	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ((𝐹‘𝐴) = 0 ↔ 𝐴 ∈ ((cls‘𝐽)‘𝑆)))
30	8, 29	bitrid 283	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 = (𝐹‘𝐴) ↔ 𝐴 ∈ ((cls‘𝐽)‘𝑆)))
31		cldcls 22546	. . . . . . 7 ⊢ (𝑆 ∈ (Clsd‘𝐽) → ((cls‘𝐽)‘𝑆) = 𝑆)
32	12, 31	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ((cls‘𝐽)‘𝑆) = 𝑆)
33	32	eleq2d 2820	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐴 ∈ ((cls‘𝐽)‘𝑆) ↔ 𝐴 ∈ 𝑆))
34	30, 33	bitrd 279	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 = (𝐹‘𝐴) ↔ 𝐴 ∈ 𝑆))
35	7, 34	mtbird 325	. . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ¬ 0 = (𝐹‘𝐴))
36	27	metdsf 24364	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋) → 𝐹:𝑋⟶(0[,]+∞))
37	10, 19, 36	syl2anc 585	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐹:𝑋⟶(0[,]+∞))
38	37, 26	ffvelcdmd 7088	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐹‘𝐴) ∈ (0[,]+∞))
39		elxrge0 13434	. . . . . . 7 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) ↔ ((𝐹‘𝐴) ∈ ℝ^* ∧ 0 ≤ (𝐹‘𝐴)))
40	39	simprbi 498	. . . . . 6 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → 0 ≤ (𝐹‘𝐴))
41	38, 40	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 0 ≤ (𝐹‘𝐴))
42		0xr 11261	. . . . . 6 ⊢ 0 ∈ ℝ^*
43		eliccxr 13412	. . . . . . 7 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → (𝐹‘𝐴) ∈ ℝ^*)
44	38, 43	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐹‘𝐴) ∈ ℝ^*)
45		xrleloe 13123	. . . . . 6 ⊢ ((0 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^*) → (0 ≤ (𝐹‘𝐴) ↔ (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴))))
46	42, 44, 45	sylancr 588	. . . . 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 863	. . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (¬ 0 < (𝐹‘𝐴) → 0 = (𝐹‘𝐴)))
49	35, 48	mt3d 148	. 2 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 0 < (𝐹‘𝐴))
50		1xr 11273	. . . . 5 ⊢ 1 ∈ ℝ^*
51		ifcl 4574	. . . . 5 ⊢ ((1 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ^)
52	50, 44, 51	sylancr 588	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ^*)
53		1red 11215	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 1 ∈ ℝ)
54		0lt1 11736	. . . . . 6 ⊢ 0 < 1
55		breq2 5153	. . . . . . 7 ⊢ (1 = if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) → (0 < 1 ↔ 0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴))))
56		breq2 5153	. . . . . . 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 4568	. . . . . 6 ⊢ ((0 < 1 ∧ 0 < (𝐹‘𝐴)) → 0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)))
58	54, 49, 57	sylancr 588	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)))
59		xrltle 13128	. . . . . 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 588	. . . . 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 13156	. . . . 5 ⊢ ((1 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^*) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ≤ 1)
63	50, 44, 62	sylancr 588	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ≤ 1)
64		xrrege0 13153	. . . 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 838	. . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ)
66	65, 58	elrpd 13013	. 2 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ⁺)
67	49, 66	jca 513	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 397 ∨ wo 846 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ∩ cin 3948 ⊆ wss 3949 ∅c0 4323 ifcif 4529 ∪ cuni 4909 class class class wbr 5149 ↦ cmpt 5232 ran crn 5678 ⟶wf 6540 ‘cfv 6544 (class class class)co 7409 infcinf 9436 ℝcr 11109 0cc0 11110 1c1 11111 +∞cpnf 11245 ℝ^*cxr 11247 < clt 11248 ≤ cle 11249 ℝ⁺crp 12974 [,]cicc 13327 ∞Metcxmet 20929 MetOpencmopn 20934 Clsdccld 22520 clsccl 22522

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 ax-pre-sup 11188

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-iin 5001 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-er 8703 df-map 8822 df-en 8940 df-dom 8941 df-sdom 8942 df-sup 9437 df-inf 9438 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-div 11872 df-nn 12213 df-2 12275 df-n0 12473 df-z 12559 df-uz 12823 df-q 12933 df-rp 12975 df-xneg 13092 df-xadd 13093 df-xmul 13094 df-icc 13331 df-topgen 17389 df-psmet 20936 df-xmet 20937 df-bl 20939 df-mopn 20940 df-top 22396 df-topon 22413 df-bases 22449 df-cld 22523 df-ntr 22524 df-cls 22525

This theorem is referenced by: metnrmlem2 24376 metnrmlem3 24377

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