Theorem nmoolb 27626

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 27619	. . . . 5 ⊢ ((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ)
4		ressxr 10083	. . . . 5 ⊢ ℝ ⊆ ℝ*
5	3, 4	syl6ss 3615	. . . 4 ⊢ ((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ*)
6	5	3adant1 1079	. . 3 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ*)
7		fveq2 6191	. . . . . . . 8 ⊢ (𝑦 = 𝐴 → (𝐿‘𝑦) = (𝐿‘𝐴))
8	7	breq1d 4663	. . . . . . 7 ⊢ (𝑦 = 𝐴 → ((𝐿‘𝑦) ≤ 1 ↔ (𝐿‘𝐴) ≤ 1))
9		fveq2 6191	. . . . . . . . 9 ⊢ (𝑦 = 𝐴 → (𝑇‘𝑦) = (𝑇‘𝐴))
10	9	fveq2d 6195	. . . . . . . 8 ⊢ (𝑦 = 𝐴 → (𝑀‘(𝑇‘𝑦)) = (𝑀‘(𝑇‘𝐴)))
11	10	eqeq2d 2632	. . . . . . 7 ⊢ (𝑦 = 𝐴 → ((𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦)) ↔ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴))))
12	8, 11	anbi12d 747	. . . . . 6 ⊢ (𝑦 = 𝐴 → (((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))) ↔ ((𝐿‘𝐴) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴)))))
13		eqid 2622	. . . . . . 7 ⊢ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴))
14	13	biantru 526	. . . . . 6 ⊢ ((𝐿‘𝐴) ≤ 1 ↔ ((𝐿‘𝐴) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴))))
15	12, 14	syl6bbr 278	. . . . 5 ⊢ (𝑦 = 𝐴 → (((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))) ↔ (𝐿‘𝐴) ≤ 1))
16	15	rspcev 3309	. . . 4 ⊢ ((𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1) → ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))))
17		fvex 6201	. . . . 5 ⊢ (𝑀‘(𝑇‘𝐴)) ∈ V
18		eqeq1 2626	. . . . . . 7 ⊢ (𝑥 = (𝑀‘(𝑇‘𝐴)) → (𝑥 = (𝑀‘(𝑇‘𝑦)) ↔ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))))
19	18	anbi2d 740	. . . . . 6 ⊢ (𝑥 = (𝑀‘(𝑇‘𝐴)) → (((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦))) ↔ ((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦)))))
20	19	rexbidv 3052	. . . . 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)))))
21	17, 20	elab 3350	. . . 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))))
22	16, 21	sylibr 224	. . 3 ⊢ ((𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1) → (𝑀‘(𝑇‘𝐴)) ∈ {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))})
23		supxrub 12154	. . 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*, < ))
24	6, 22, 23	syl2an 494	. 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*, < ))
25		nmoolb.1	. . . 4 ⊢ 𝑋 = (BaseSet‘𝑈)
26		nmoolb.l	. . . 4 ⊢ 𝐿 = (normCV‘𝑈)
27		nmoolb.3	. . . 4 ⊢ 𝑁 = (𝑈 normOpOLD 𝑊)
28	25, 1, 26, 2, 27	nmooval 27618	. . 3 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → (𝑁‘𝑇) = sup({𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))}, ℝ*, < ))
29	28	adantr 481	. 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*, < ))
30	24, 29	breqtrrd 4681	1 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ (𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1)) → (𝑀‘(𝑇‘𝐴)) ≤ (𝑁‘𝑇))

Syntax hints:   → wi 4   ∧ wa 384   ∧ w3a 1037   = wceq 1483   ∈ wcel 1990  {cab 2608  ∃wrex 2913   ⊆ wss 3574   class class class wbr 4653  ⟶wf 5884  ‘cfv 5888  (class class class)co 6650  supcsup 8346  ℝcr 9935  1c1 9937  ℝ^*cxr 10073   < clt 10074   ≤ cle 10075  NrmCVeccnv 27439  BaseSetcba 27441  norm_CVcnmcv 27445   normOp_OLD cnmoo 27596

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013  ax-pre-sup 10014

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-po 5035  df-so 5036  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-1st 7168  df-2nd 7169  df-er 7742  df-map 7859  df-en 7956  df-dom 7957  df-sdom 7958  df-sup 8348  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-vc 27414  df-nv 27447  df-va 27450  df-ba 27451  df-sm 27452  df-0v 27453  df-nmcv 27455  df-nmoo 27600

This theorem is referenced by:  nmblolbii  27654