Theorem nmoolb 29034

Description: A lower bound for an operator norm. (Contributed by NM, 8-Dec-2007.) (New usage is discouraged.)

Hypotheses

Ref	Expression
nmoolb.1	⊢ 𝑋 = (BaseSet‘𝑈)
nmoolb.2	⊢ 𝑌 = (BaseSet‘𝑊)
nmoolb.l	⊢ 𝐿 = (normCV‘𝑈)
nmoolb.m	⊢ 𝑀 = (normCV‘𝑊)
nmoolb.3	⊢ 𝑁 = (𝑈 normOpOLD 𝑊)

Assertion

Ref	Expression
nmoolb	⊢ (((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ (𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1)) → (𝑀‘(𝑇‘𝐴)) ≤ (𝑁‘𝑇))

Proof of Theorem nmoolb

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nmoolb.2	. . . . . 6 ⊢ 𝑌 = (BaseSet‘𝑊)
2		nmoolb.m	. . . . . 6 ⊢ 𝑀 = (normCV‘𝑊)
3	1, 2	nmosetre 29027	. . . . 5 ⊢ ((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ)
4		ressxr 10950	. . . . 5 ⊢ ℝ ⊆ ℝ*
5	3, 4	sstrdi 3929	. . . 4 ⊢ ((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ*)
6	5	3adant1 1128	. . 3 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ*)
7		fveq2 6756	. . . . . . . 8 ⊢ (𝑦 = 𝐴 → (𝐿‘𝑦) = (𝐿‘𝐴))
8	7	breq1d 5080	. . . . . . 7 ⊢ (𝑦 = 𝐴 → ((𝐿‘𝑦) ≤ 1 ↔ (𝐿‘𝐴) ≤ 1))
9		2fveq3 6761	. . . . . . . 8 ⊢ (𝑦 = 𝐴 → (𝑀‘(𝑇‘𝑦)) = (𝑀‘(𝑇‘𝐴)))
10	9	eqeq2d 2749	. . . . . . 7 ⊢ (𝑦 = 𝐴 → ((𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦)) ↔ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴))))
11	8, 10	anbi12d 630	. . . . . 6 ⊢ (𝑦 = 𝐴 → (((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))) ↔ ((𝐿‘𝐴) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴)))))
12		eqid 2738	. . . . . . 7 ⊢ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴))
13	12	biantru 529	. . . . . 6 ⊢ ((𝐿‘𝐴) ≤ 1 ↔ ((𝐿‘𝐴) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴))))
14	11, 13	bitr4di 288	. . . . 5 ⊢ (𝑦 = 𝐴 → (((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))) ↔ (𝐿‘𝐴) ≤ 1))
15	14	rspcev 3552	. . . 4 ⊢ ((𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1) → ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))))
16		fvex 6769	. . . . 5 ⊢ (𝑀‘(𝑇‘𝐴)) ∈ V
17		eqeq1 2742	. . . . . . 7 ⊢ (𝑥 = (𝑀‘(𝑇‘𝐴)) → (𝑥 = (𝑀‘(𝑇‘𝑦)) ↔ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))))
18	17	anbi2d 628	. . . . . 6 ⊢ (𝑥 = (𝑀‘(𝑇‘𝐴)) → (((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦))) ↔ ((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦)))))
19	18	rexbidv 3225	. . . . 5 ⊢ (𝑥 = (𝑀‘(𝑇‘𝐴)) → (∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦))) ↔ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦)))))
20	16, 19	elab 3602	. . . 4 ⊢ ((𝑀‘(𝑇‘𝐴)) ∈ {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ↔ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))))
21	15, 20	sylibr 233	. . 3 ⊢ ((𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1) → (𝑀‘(𝑇‘𝐴)) ∈ {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))})
22		supxrub 12987	. . 3 ⊢ (({𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ* ∧ (𝑀‘(𝑇‘𝐴)) ∈ {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))}) → (𝑀‘(𝑇‘𝐴)) ≤ sup({𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))}, ℝ*, < ))
23	6, 21, 22	syl2an 595	. 2 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ (𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1)) → (𝑀‘(𝑇‘𝐴)) ≤ sup({𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))}, ℝ*, < ))
24		nmoolb.1	. . . 4 ⊢ 𝑋 = (BaseSet‘𝑈)
25		nmoolb.l	. . . 4 ⊢ 𝐿 = (normCV‘𝑈)
26		nmoolb.3	. . . 4 ⊢ 𝑁 = (𝑈 normOpOLD 𝑊)
27	24, 1, 25, 2, 26	nmooval 29026	. . 3 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → (𝑁‘𝑇) = sup({𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))}, ℝ*, < ))
28	27	adantr 480	. 2 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ (𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1)) → (𝑁‘𝑇) = sup({𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))}, ℝ*, < ))
29	23, 28	breqtrrd 5098	1 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ (𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1)) → (𝑀‘(𝑇‘𝐴)) ≤ (𝑁‘𝑇))

Syntax hints:   → wi 4   ∧ wa 395   ∧ w3a 1085   = wceq 1539   ∈ wcel 2108  {cab 2715  ∃wrex 3064   ⊆ wss 3883   class class class wbr 5070  ⟶wf 6414  ‘cfv 6418  (class class class)co 7255  supcsup 9129  ℝcr 10801  1c1 10803  ℝ^*cxr 10939   < clt 10940   ≤ cle 10941  NrmCVeccnv 28847  BaseSetcba 28849  norm_CVcnmcv 28853   normOp_OLD cnmoo 29004

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566  ax-cnex 10858  ax-resscn 10859  ax-1cn 10860  ax-icn 10861  ax-addcl 10862  ax-addrcl 10863  ax-mulcl 10864  ax-mulrcl 10865  ax-mulcom 10866  ax-addass 10867  ax-mulass 10868  ax-distr 10869  ax-i2m1 10870  ax-1ne0 10871  ax-1rid 10872  ax-rnegex 10873  ax-rrecex 10874  ax-cnre 10875  ax-pre-lttri 10876  ax-pre-lttrn 10877  ax-pre-ltadd 10878  ax-pre-mulgt0 10879  ax-pre-sup 10880

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-nel 3049  df-ral 3068  df-rex 3069  df-reu 3070  df-rmo 3071  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4837  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-id 5480  df-po 5494  df-so 5495  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-riota 7212  df-ov 7258  df-oprab 7259  df-mpo 7260  df-1st 7804  df-2nd 7805  df-er 8456  df-map 8575  df-en 8692  df-dom 8693  df-sdom 8694  df-sup 9131  df-pnf 10942  df-mnf 10943  df-xr 10944  df-ltxr 10945  df-le 10946  df-sub 11137  df-neg 11138  df-vc 28822  df-nv 28855  df-va 28858  df-ba 28859  df-sm 28860  df-0v 28861  df-nmcv 28863  df-nmoo 29008

This theorem is referenced by:  nmblolbii  29062