Theorem nmoolb 27010

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 27003	. . . . 5 ⊢ ((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ)
4		ressxr 9962	. . . . 5 ⊢ ℝ ⊆ ℝ*
5	3, 4	syl6ss 3580	. . . 4 ⊢ ((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ*)
6	5	3adant1 1072	. . 3 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))} ⊆ ℝ*)
7		fveq2 6103	. . . . . . . 8 ⊢ (𝑦 = 𝐴 → (𝐿‘𝑦) = (𝐿‘𝐴))
8	7	breq1d 4593	. . . . . . 7 ⊢ (𝑦 = 𝐴 → ((𝐿‘𝑦) ≤ 1 ↔ (𝐿‘𝐴) ≤ 1))
9		fveq2 6103	. . . . . . . . 9 ⊢ (𝑦 = 𝐴 → (𝑇‘𝑦) = (𝑇‘𝐴))
10	9	fveq2d 6107	. . . . . . . 8 ⊢ (𝑦 = 𝐴 → (𝑀‘(𝑇‘𝑦)) = (𝑀‘(𝑇‘𝐴)))
11	10	eqeq2d 2620	. . . . . . 7 ⊢ (𝑦 = 𝐴 → ((𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦)) ↔ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴))))
12	8, 11	anbi12d 743	. . . . . 6 ⊢ (𝑦 = 𝐴 → (((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))) ↔ ((𝐿‘𝐴) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴)))))
13		eqid 2610	. . . . . . 7 ⊢ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴))
14	13	biantru 525	. . . . . 6 ⊢ ((𝐿‘𝐴) ≤ 1 ↔ ((𝐿‘𝐴) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝐴))))
15	12, 14	syl6bbr 277	. . . . 5 ⊢ (𝑦 = 𝐴 → (((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))) ↔ (𝐿‘𝐴) ≤ 1))
16	15	rspcev 3282	. . . 4 ⊢ ((𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1) → ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))))
17		fvex 6113	. . . . 5 ⊢ (𝑀‘(𝑇‘𝐴)) ∈ V
18		eqeq1 2614	. . . . . . 7 ⊢ (𝑥 = (𝑀‘(𝑇‘𝐴)) → (𝑥 = (𝑀‘(𝑇‘𝑦)) ↔ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦))))
19	18	anbi2d 736	. . . . . 6 ⊢ (𝑥 = (𝑀‘(𝑇‘𝐴)) → (((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦))) ↔ ((𝐿‘𝑦) ≤ 1 ∧ (𝑀‘(𝑇‘𝐴)) = (𝑀‘(𝑇‘𝑦)))))
20	19	rexbidv 3034	. . . . 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 3319	. . . 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 223	. . 3 ⊢ ((𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1) → (𝑀‘(𝑇‘𝐴)) ∈ {𝑥 ∣ ∃𝑦 ∈ 𝑋 ((𝐿‘𝑦) ≤ 1 ∧ 𝑥 = (𝑀‘(𝑇‘𝑦)))})
23		supxrub 12026	. . 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 493	. 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 27002	. . 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 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*, < ))
30	24, 29	breqtrrd 4611	1 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ (𝐴 ∈ 𝑋 ∧ (𝐿‘𝐴) ≤ 1)) → (𝑀‘(𝑇‘𝐴)) ≤ (𝑁‘𝑇))

Syntax hints:   → wi 4   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  {cab 2596  ∃wrex 2897   ⊆ wss 3540   class class class wbr 4583  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549  supcsup 8229  ℝcr 9814  1c1 9816  ℝ^*cxr 9952   < clt 9953   ≤ cle 9954  NrmCVeccnv 26823  BaseSetcba 26825  norm_CVcnmcv 26829   normOp_OLD cnmoo 26980

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892  ax-pre-sup 9893

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-po 4959  df-so 4960  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-1st 7059  df-2nd 7060  df-er 7629  df-map 7746  df-en 7842  df-dom 7843  df-sdom 7844  df-sup 8231  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-vc 26798  df-nv 26831  df-va 26834  df-ba 26835  df-sm 26836  df-0v 26837  df-nmcv 26839  df-nmoo 26984

This theorem is referenced by:  nmblolbii  27038