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Theorem nmosetre 30646

Description: The set in the supremum of the operator norm definition df-nmoo 30627 is a set of reals. (Contributed by NM, 13-Nov-2007.) (New usage is discouraged.)

**Hypotheses**
Ref	Expression
nmosetre.2	⊢ 𝑌 = (BaseSet‘𝑊)
nmosetre.4	⊢ 𝑁 = (norm_CV‘𝑊)

**Assertion**
Ref	Expression
nmosetre	⊢ ((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑧 ∈ 𝑋 ((𝑀‘𝑧) ≤ 1 ∧ 𝑥 = (𝑁‘(𝑇‘𝑧)))} ⊆ ℝ)

Distinct variable groups: 𝑥,𝑧,𝑇 𝑥,𝑊,𝑧 𝑥,𝑋,𝑧 𝑥,𝑌,𝑧 Allowed substitution hints: 𝑀(𝑥,𝑧) 𝑁(𝑥,𝑧)

**Proof of Theorem nmosetre**
Step	Hyp	Ref	Expression
1		ffvelcdm 7090	. . . . . . . 8 ⊢ ((𝑇:𝑋⟶𝑌 ∧ 𝑧 ∈ 𝑋) → (𝑇‘𝑧) ∈ 𝑌)
2		nmosetre.2	. . . . . . . . 9 ⊢ 𝑌 = (BaseSet‘𝑊)
3		nmosetre.4	. . . . . . . . 9 ⊢ 𝑁 = (norm_CV‘𝑊)
4	2, 3	nvcl 30543	. . . . . . . 8 ⊢ ((𝑊 ∈ NrmCVec ∧ (𝑇‘𝑧) ∈ 𝑌) → (𝑁‘(𝑇‘𝑧)) ∈ ℝ)
5	1, 4	sylan2 591	. . . . . . 7 ⊢ ((𝑊 ∈ NrmCVec ∧ (𝑇:𝑋⟶𝑌 ∧ 𝑧 ∈ 𝑋)) → (𝑁‘(𝑇‘𝑧)) ∈ ℝ)
6	5	anassrs 466	. . . . . 6 ⊢ (((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ 𝑧 ∈ 𝑋) → (𝑁‘(𝑇‘𝑧)) ∈ ℝ)
7		eleq1 2813	. . . . . 6 ⊢ (𝑥 = (𝑁‘(𝑇‘𝑧)) → (𝑥 ∈ ℝ ↔ (𝑁‘(𝑇‘𝑧)) ∈ ℝ))
8	6, 7	imbitrrid 245	. . . . 5 ⊢ (𝑥 = (𝑁‘(𝑇‘𝑧)) → (((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ 𝑧 ∈ 𝑋) → 𝑥 ∈ ℝ))
9	8	impcom 406	. . . 4 ⊢ ((((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ 𝑧 ∈ 𝑋) ∧ 𝑥 = (𝑁‘(𝑇‘𝑧))) → 𝑥 ∈ ℝ)
10	9	adantrl 714	. . 3 ⊢ ((((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) ∧ 𝑧 ∈ 𝑋) ∧ ((𝑀‘𝑧) ≤ 1 ∧ 𝑥 = (𝑁‘(𝑇‘𝑧)))) → 𝑥 ∈ ℝ)
11	10	rexlimdva2 3146	. 2 ⊢ ((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → (∃𝑧 ∈ 𝑋 ((𝑀‘𝑧) ≤ 1 ∧ 𝑥 = (𝑁‘(𝑇‘𝑧))) → 𝑥 ∈ ℝ))
12	11	abssdv 4061	1 ⊢ ((𝑊 ∈ NrmCVec ∧ 𝑇:𝑋⟶𝑌) → {𝑥 ∣ ∃𝑧 ∈ 𝑋 ((𝑀‘𝑧) ≤ 1 ∧ 𝑥 = (𝑁‘(𝑇‘𝑧)))} ⊆ ℝ)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 394 = wceq 1533 ∈ wcel 2098 {cab 2702 ∃wrex 3059 ⊆ wss 3944 class class class wbr 5149 ⟶wf 6545 ‘cfv 6549 ℝcr 11139 1c1 11141 ≤ cle 11281 NrmCVeccnv 30466 BaseSetcba 30468 norm_CVcnmcv 30472

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pr 5429 ax-un 7741

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2930 df-ral 3051 df-rex 3060 df-reu 3364 df-rab 3419 df-v 3463 df-sbc 3774 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-nul 4323 df-if 4531 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4910 df-iun 4999 df-br 5150 df-opab 5212 df-mpt 5233 df-id 5576 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-iota 6501 df-fun 6551 df-fn 6552 df-f 6553 df-f1 6554 df-fo 6555 df-f1o 6556 df-fv 6557 df-ov 7422 df-oprab 7423 df-1st 7994 df-2nd 7995 df-vc 30441 df-nv 30474 df-va 30477 df-ba 30478 df-sm 30479 df-0v 30480 df-nmcv 30482

This theorem is referenced by: nmoxr 30648 nmooge0 30649 nmorepnf 30650 nmoolb 30653 nmoubi 30654 nmlno0lem 30675 nmopsetretHIL 31746

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