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Theorem metnrmlem1a 24787

Description: Lemma for metnrm 24791. (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 480	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝑆 ∩ 𝑇) = ∅)
3		inelcm 4465	. . . . . . . 8 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝐴 ∈ 𝑇) → (𝑆 ∩ 𝑇) ≠ ∅)
4	3	expcom 413	. . . . . . 7 ⊢ (𝐴 ∈ 𝑇 → (𝐴 ∈ 𝑆 → (𝑆 ∩ 𝑇) ≠ ∅))
5	4	adantl 481	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐴 ∈ 𝑆 → (𝑆 ∩ 𝑇) ≠ ∅))
6	5	necon2bd 2953	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ((𝑆 ∩ 𝑇) = ∅ → ¬ 𝐴 ∈ 𝑆))
7	2, 6	mpd 15	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ¬ 𝐴 ∈ 𝑆)
8		eqcom 2735	. . . . . 6 ⊢ (0 = (𝐹‘𝐴) ↔ (𝐹‘𝐴) = 0)
9		metnrmlem.1	. . . . . . . 8 ⊢ (𝜑 → 𝐷 ∈ (∞Met‘𝑋))
10	9	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐷 ∈ (∞Met‘𝑋))
11		metnrmlem.2	. . . . . . . . . 10 ⊢ (𝜑 → 𝑆 ∈ (Clsd‘𝐽))
12	11	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑆 ∈ (Clsd‘𝐽))
13		eqid 2728	. . . . . . . . . 10 ⊢ ∪ 𝐽 = ∪ 𝐽
14	13	cldss 22946	. . . . . . . . 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 24360	. . . . . . . . 9 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝑋 = ∪ 𝐽)
18	10, 17	syl 17	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑋 = ∪ 𝐽)
19	15, 18	sseqtrrd 4021	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑆 ⊆ 𝑋)
20		metnrmlem.3	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑇 ∈ (Clsd‘𝐽))
21	20	adantr 480	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑇 ∈ (Clsd‘𝐽))
22	13	cldss 22946	. . . . . . . . . 10 ⊢ (𝑇 ∈ (Clsd‘𝐽) → 𝑇 ⊆ ∪ 𝐽)
23	21, 22	syl 17	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑇 ⊆ ∪ 𝐽)
24	23, 18	sseqtrrd 4021	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝑇 ⊆ 𝑋)
25		simpr 484	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐴 ∈ 𝑇)
26	24, 25	sseldd 3981	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐴 ∈ 𝑋)
27		metdscn.f	. . . . . . . 8 ⊢ 𝐹 = (𝑥 ∈ 𝑋 ↦ inf(ran (𝑦 ∈ 𝑆 ↦ (𝑥𝐷𝑦)), ℝ^*, < ))
28	27, 16	metdseq0 24783	. . . . . . 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 283	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (0 = (𝐹‘𝐴) ↔ 𝐴 ∈ ((cls‘𝐽)‘𝑆)))
31		cldcls 22959	. . . . . . 7 ⊢ (𝑆 ∈ (Clsd‘𝐽) → ((cls‘𝐽)‘𝑆) = 𝑆)
32	12, 31	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → ((cls‘𝐽)‘𝑆) = 𝑆)
33	32	eleq2d 2815	. . . . 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 24777	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑆 ⊆ 𝑋) → 𝐹:𝑋⟶(0[,]+∞))
37	10, 19, 36	syl2anc 583	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 𝐹:𝑋⟶(0[,]+∞))
38	37, 26	ffvelcdmd 7095	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐹‘𝐴) ∈ (0[,]+∞))
39		elxrge0 13467	. . . . . . 7 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) ↔ ((𝐹‘𝐴) ∈ ℝ^* ∧ 0 ≤ (𝐹‘𝐴)))
40	39	simprbi 496	. . . . . 6 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → 0 ≤ (𝐹‘𝐴))
41	38, 40	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 0 ≤ (𝐹‘𝐴))
42		0xr 11292	. . . . . 6 ⊢ 0 ∈ ℝ^*
43		eliccxr 13445	. . . . . . 7 ⊢ ((𝐹‘𝐴) ∈ (0[,]+∞) → (𝐹‘𝐴) ∈ ℝ^*)
44	38, 43	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → (𝐹‘𝐴) ∈ ℝ^*)
45		xrleloe 13156	. . . . . 6 ⊢ ((0 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^*) → (0 ≤ (𝐹‘𝐴) ↔ (0 < (𝐹‘𝐴) ∨ 0 = (𝐹‘𝐴))))
46	42, 44, 45	sylancr 586	. . . . 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 11304	. . . . 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 586	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ^*)
53		1red 11246	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 1 ∈ ℝ)
54		0lt1 11767	. . . . . 6 ⊢ 0 < 1
55		breq2 5152	. . . . . . 7 ⊢ (1 = if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) → (0 < 1 ↔ 0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴))))
56		breq2 5152	. . . . . . 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 586	. . . . 5 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → 0 < if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)))
59		xrltle 13161	. . . . . 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 586	. . . . 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 13189	. . . . 5 ⊢ ((1 ∈ ℝ^* ∧ (𝐹‘𝐴) ∈ ℝ^*) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ≤ 1)
63	50, 44, 62	sylancr 586	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ≤ 1)
64		xrrege0 13186	. . . 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 13046	. 2 ⊢ ((𝜑 ∧ 𝐴 ∈ 𝑇) → if(1 ≤ (𝐹‘𝐴), 1, (𝐹‘𝐴)) ∈ ℝ⁺)
67	49, 66	jca 511	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 395 ∨ wo 846 = wceq 1534 ∈ wcel 2099 ≠ wne 2937 ∩ cin 3946 ⊆ wss 3947 ∅c0 4323 ifcif 4529 ∪ cuni 4908 class class class wbr 5148 ↦ cmpt 5231 ran crn 5679 ⟶wf 6544 ‘cfv 6548 (class class class)co 7420 infcinf 9465 ℝcr 11138 0cc0 11139 1c1 11140 +∞cpnf 11276 ℝ^*cxr 11278 < clt 11279 ≤ cle 11280 ℝ⁺crp 13007 [,]cicc 13360 ∞Metcxmet 21264 MetOpencmopn 21269 Clsdccld 22933 clsccl 22935

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11195 ax-resscn 11196 ax-1cn 11197 ax-icn 11198 ax-addcl 11199 ax-addrcl 11200 ax-mulcl 11201 ax-mulrcl 11202 ax-mulcom 11203 ax-addass 11204 ax-mulass 11205 ax-distr 11206 ax-i2m1 11207 ax-1ne0 11208 ax-1rid 11209 ax-rnegex 11210 ax-rrecex 11211 ax-cnre 11212 ax-pre-lttri 11213 ax-pre-lttrn 11214 ax-pre-ltadd 11215 ax-pre-mulgt0 11216 ax-pre-sup 11217

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-int 4950 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7871 df-1st 7993 df-2nd 7994 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-er 8725 df-map 8847 df-en 8965 df-dom 8966 df-sdom 8967 df-sup 9466 df-inf 9467 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284 df-le 11285 df-sub 11477 df-neg 11478 df-div 11903 df-nn 12244 df-2 12306 df-n0 12504 df-z 12590 df-uz 12854 df-q 12964 df-rp 13008 df-xneg 13125 df-xadd 13126 df-xmul 13127 df-icc 13364 df-topgen 17425 df-psmet 21271 df-xmet 21272 df-bl 21274 df-mopn 21275 df-top 22809 df-topon 22826 df-bases 22862 df-cld 22936 df-ntr 22937 df-cls 22938

This theorem is referenced by: metnrmlem2 24789 metnrmlem3 24790

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