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| Description: The norm of any Hilbert space functional is nonnegative. (Contributed by NM, 24-May-2006.) (New usage is discouraged.) | 
| Ref | Expression | 
|---|---|
| nmfnge0 | ⊢ (𝑇: ℋ⟶ℂ → 0 ≤ (normfn‘𝑇)) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | ax-hv0cl 31023 | . . . 4 ⊢ 0ℎ ∈ ℋ | |
| 2 | ffvelcdm 7100 | . . . 4 ⊢ ((𝑇: ℋ⟶ℂ ∧ 0ℎ ∈ ℋ) → (𝑇‘0ℎ) ∈ ℂ) | |
| 3 | 1, 2 | mpan2 691 | . . 3 ⊢ (𝑇: ℋ⟶ℂ → (𝑇‘0ℎ) ∈ ℂ) | 
| 4 | 3 | absge0d 15484 | . 2 ⊢ (𝑇: ℋ⟶ℂ → 0 ≤ (abs‘(𝑇‘0ℎ))) | 
| 5 | norm0 31148 | . . . 4 ⊢ (normℎ‘0ℎ) = 0 | |
| 6 | 0le1 11787 | . . . 4 ⊢ 0 ≤ 1 | |
| 7 | 5, 6 | eqbrtri 5163 | . . 3 ⊢ (normℎ‘0ℎ) ≤ 1 | 
| 8 | nmfnlb 31944 | . . 3 ⊢ ((𝑇: ℋ⟶ℂ ∧ 0ℎ ∈ ℋ ∧ (normℎ‘0ℎ) ≤ 1) → (abs‘(𝑇‘0ℎ)) ≤ (normfn‘𝑇)) | |
| 9 | 1, 7, 8 | mp3an23 1454 | . 2 ⊢ (𝑇: ℋ⟶ℂ → (abs‘(𝑇‘0ℎ)) ≤ (normfn‘𝑇)) | 
| 10 | 3 | abscld 15476 | . . . 4 ⊢ (𝑇: ℋ⟶ℂ → (abs‘(𝑇‘0ℎ)) ∈ ℝ) | 
| 11 | 10 | rexrd 11312 | . . 3 ⊢ (𝑇: ℋ⟶ℂ → (abs‘(𝑇‘0ℎ)) ∈ ℝ*) | 
| 12 | nmfnxr 31899 | . . 3 ⊢ (𝑇: ℋ⟶ℂ → (normfn‘𝑇) ∈ ℝ*) | |
| 13 | 0xr 11309 | . . . 4 ⊢ 0 ∈ ℝ* | |
| 14 | xrletr 13201 | . . . 4 ⊢ ((0 ∈ ℝ* ∧ (abs‘(𝑇‘0ℎ)) ∈ ℝ* ∧ (normfn‘𝑇) ∈ ℝ*) → ((0 ≤ (abs‘(𝑇‘0ℎ)) ∧ (abs‘(𝑇‘0ℎ)) ≤ (normfn‘𝑇)) → 0 ≤ (normfn‘𝑇))) | |
| 15 | 13, 14 | mp3an1 1449 | . . 3 ⊢ (((abs‘(𝑇‘0ℎ)) ∈ ℝ* ∧ (normfn‘𝑇) ∈ ℝ*) → ((0 ≤ (abs‘(𝑇‘0ℎ)) ∧ (abs‘(𝑇‘0ℎ)) ≤ (normfn‘𝑇)) → 0 ≤ (normfn‘𝑇))) | 
| 16 | 11, 12, 15 | syl2anc 584 | . 2 ⊢ (𝑇: ℋ⟶ℂ → ((0 ≤ (abs‘(𝑇‘0ℎ)) ∧ (abs‘(𝑇‘0ℎ)) ≤ (normfn‘𝑇)) → 0 ≤ (normfn‘𝑇))) | 
| 17 | 4, 9, 16 | mp2and 699 | 1 ⊢ (𝑇: ℋ⟶ℂ → 0 ≤ (normfn‘𝑇)) | 
| Colors of variables: wff setvar class | 
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2107 class class class wbr 5142 ⟶wf 6556 ‘cfv 6560 ℂcc 11154 0cc0 11156 1c1 11157 ℝ*cxr 11295 ≤ cle 11297 abscabs 15274 ℋchba 30939 normℎcno 30943 0ℎc0v 30944 normfncnmf 30971 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2707 ax-sep 5295 ax-nul 5305 ax-pow 5364 ax-pr 5431 ax-un 7756 ax-cnex 11212 ax-resscn 11213 ax-1cn 11214 ax-icn 11215 ax-addcl 11216 ax-addrcl 11217 ax-mulcl 11218 ax-mulrcl 11219 ax-mulcom 11220 ax-addass 11221 ax-mulass 11222 ax-distr 11223 ax-i2m1 11224 ax-1ne0 11225 ax-1rid 11226 ax-rnegex 11227 ax-rrecex 11228 ax-cnre 11229 ax-pre-lttri 11230 ax-pre-lttrn 11231 ax-pre-ltadd 11232 ax-pre-mulgt0 11233 ax-pre-sup 11234 ax-hilex 31019 ax-hv0cl 31023 ax-hvmul0 31030 ax-hfi 31099 ax-his3 31104 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2728 df-clel 2815 df-nfc 2891 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3379 df-reu 3380 df-rab 3436 df-v 3481 df-sbc 3788 df-csb 3899 df-dif 3953 df-un 3955 df-in 3957 df-ss 3967 df-pss 3970 df-nul 4333 df-if 4525 df-pw 4601 df-sn 4626 df-pr 4628 df-op 4632 df-uni 4907 df-iun 4992 df-br 5143 df-opab 5205 df-mpt 5225 df-tr 5259 df-id 5577 df-eprel 5583 df-po 5591 df-so 5592 df-fr 5636 df-we 5638 df-xp 5690 df-rel 5691 df-cnv 5692 df-co 5693 df-dm 5694 df-rn 5695 df-res 5696 df-ima 5697 df-pred 6320 df-ord 6386 df-on 6387 df-lim 6388 df-suc 6389 df-iota 6513 df-fun 6562 df-fn 6563 df-f 6564 df-f1 6565 df-fo 6566 df-f1o 6567 df-fv 6568 df-riota 7389 df-ov 7435 df-oprab 7436 df-mpo 7437 df-om 7889 df-2nd 8016 df-frecs 8307 df-wrecs 8338 df-recs 8412 df-rdg 8451 df-er 8746 df-map 8869 df-en 8987 df-dom 8988 df-sdom 8989 df-sup 9483 df-pnf 11298 df-mnf 11299 df-xr 11300 df-ltxr 11301 df-le 11302 df-sub 11495 df-neg 11496 df-div 11922 df-nn 12268 df-2 12330 df-3 12331 df-n0 12529 df-z 12616 df-uz 12880 df-rp 13036 df-seq 14044 df-exp 14104 df-cj 15139 df-re 15140 df-im 15141 df-sqrt 15275 df-abs 15276 df-hnorm 30988 df-nmfn 31865 | 
| This theorem is referenced by: (None) | 
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