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| Mirrors > Home > HSE Home > Th. List > nmfn0 | Structured version Visualization version GIF version | ||
| Description: The norm of the identically zero functional is zero. (Contributed by NM, 25-Apr-2006.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| nmfn0 | ⊢ (normfn‘( ℋ × {0})) = 0 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0lnfn 32278 | . . 3 ⊢ ( ℋ × {0}) ∈ LinFn | |
| 2 | lnfnf 32177 | . . 3 ⊢ (( ℋ × {0}) ∈ LinFn → ( ℋ × {0}): ℋ⟶ℂ) | |
| 3 | nmfnval 32169 | . . 3 ⊢ (( ℋ × {0}): ℋ⟶ℂ → (normfn‘( ℋ × {0})) = sup({𝑥 ∣ ∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = (abs‘(( ℋ × {0})‘𝑦)))}, ℝ*, < )) | |
| 4 | 1, 2, 3 | mp2b 10 | . 2 ⊢ (normfn‘( ℋ × {0})) = sup({𝑥 ∣ ∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = (abs‘(( ℋ × {0})‘𝑦)))}, ℝ*, < ) |
| 5 | c0ex 11200 | . . . . . . . . . . . 12 ⊢ 0 ∈ V | |
| 6 | 5 | fvconst2 7203 | . . . . . . . . . . 11 ⊢ (𝑦 ∈ ℋ → (( ℋ × {0})‘𝑦) = 0) |
| 7 | 6 | fveq2d 6886 | . . . . . . . . . 10 ⊢ (𝑦 ∈ ℋ → (abs‘(( ℋ × {0})‘𝑦)) = (abs‘0)) |
| 8 | abs0 15336 | . . . . . . . . . 10 ⊢ (abs‘0) = 0 | |
| 9 | 7, 8 | eqtrdi 2820 | . . . . . . . . 9 ⊢ (𝑦 ∈ ℋ → (abs‘(( ℋ × {0})‘𝑦)) = 0) |
| 10 | 9 | eqeq2d 2780 | . . . . . . . 8 ⊢ (𝑦 ∈ ℋ → (𝑥 = (abs‘(( ℋ × {0})‘𝑦)) ↔ 𝑥 = 0)) |
| 11 | 10 | anbi2d 641 | . . . . . . 7 ⊢ (𝑦 ∈ ℋ → (((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = (abs‘(( ℋ × {0})‘𝑦))) ↔ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = 0))) |
| 12 | 11 | rexbiia 3116 | . . . . . 6 ⊢ (∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = (abs‘(( ℋ × {0})‘𝑦))) ↔ ∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = 0)) |
| 13 | ax-hv0cl 31296 | . . . . . . . 8 ⊢ 0ℎ ∈ ℋ | |
| 14 | 0le1 11737 | . . . . . . . 8 ⊢ 0 ≤ 1 | |
| 15 | fveq2 6882 | . . . . . . . . . . 11 ⊢ (𝑦 = 0ℎ → (normℎ‘𝑦) = (normℎ‘0ℎ)) | |
| 16 | norm0 31421 | . . . . . . . . . . 11 ⊢ (normℎ‘0ℎ) = 0 | |
| 17 | 15, 16 | eqtrdi 2820 | . . . . . . . . . 10 ⊢ (𝑦 = 0ℎ → (normℎ‘𝑦) = 0) |
| 18 | 17 | breq1d 5123 | . . . . . . . . 9 ⊢ (𝑦 = 0ℎ → ((normℎ‘𝑦) ≤ 1 ↔ 0 ≤ 1)) |
| 19 | 18 | rspcev 3590 | . . . . . . . 8 ⊢ ((0ℎ ∈ ℋ ∧ 0 ≤ 1) → ∃𝑦 ∈ ℋ (normℎ‘𝑦) ≤ 1) |
| 20 | 13, 14, 19 | mp2an 704 | . . . . . . 7 ⊢ ∃𝑦 ∈ ℋ (normℎ‘𝑦) ≤ 1 |
| 21 | r19.41v 3201 | . . . . . . 7 ⊢ (∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = 0) ↔ (∃𝑦 ∈ ℋ (normℎ‘𝑦) ≤ 1 ∧ 𝑥 = 0)) | |
| 22 | 20, 21 | mpbiran 721 | . . . . . 6 ⊢ (∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = 0) ↔ 𝑥 = 0) |
| 23 | 12, 22 | bitri 278 | . . . . 5 ⊢ (∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = (abs‘(( ℋ × {0})‘𝑦))) ↔ 𝑥 = 0) |
| 24 | 23 | abbii 2836 | . . . 4 ⊢ {𝑥 ∣ ∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = (abs‘(( ℋ × {0})‘𝑦)))} = {𝑥 ∣ 𝑥 = 0} |
| 25 | df-sn 4595 | . . . 4 ⊢ {0} = {𝑥 ∣ 𝑥 = 0} | |
| 26 | 24, 25 | eqtr4i 2795 | . . 3 ⊢ {𝑥 ∣ ∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = (abs‘(( ℋ × {0})‘𝑦)))} = {0} |
| 27 | 26 | supeq1i 9407 | . 2 ⊢ sup({𝑥 ∣ ∃𝑦 ∈ ℋ ((normℎ‘𝑦) ≤ 1 ∧ 𝑥 = (abs‘(( ℋ × {0})‘𝑦)))}, ℝ*, < ) = sup({0}, ℝ*, < ) |
| 28 | xrltso 13166 | . . 3 ⊢ < Or ℝ* | |
| 29 | 0xr 11256 | . . 3 ⊢ 0 ∈ ℝ* | |
| 30 | supsn 9433 | . . 3 ⊢ (( < Or ℝ* ∧ 0 ∈ ℝ*) → sup({0}, ℝ*, < ) = 0) | |
| 31 | 28, 29, 30 | mp2an 704 | . 2 ⊢ sup({0}, ℝ*, < ) = 0 |
| 32 | 4, 27, 31 | 3eqtri 2796 | 1 ⊢ (normfn‘( ℋ × {0})) = 0 |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 400 = wceq 1567 ∈ wcel 2149 {cab 2747 ∃wrex 3095 {csn 4594 class class class wbr 5113 Or wor 5569 × cxp 5660 ⟶wf 6533 ‘cfv 6537 supcsup 9400 ℂcc 11098 0cc0 11100 1c1 11101 ℝ*cxr 11242 < clt 11243 ≤ cle 11244 abscabs 15285 ℋchba 31212 normℎcno 31216 0ℎc0v 31217 normfncnmf 31244 LinFnclf 31247 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-cnex 11156 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 ax-pre-mulgt0 11177 ax-hilex 31292 ax-hfvadd 31293 ax-hv0cl 31296 ax-hfvmul 31298 ax-hvmul0 31303 ax-hfi 31372 ax-his3 31377 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rmo 3376 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-iun 4962 df-br 5114 df-opab 5178 df-mpt 5197 df-tr 5223 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7863 df-2nd 7987 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-er 8694 df-map 8826 df-en 8944 df-dom 8945 df-sdom 8946 df-sup 9402 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11443 df-neg 11444 df-div 11872 df-nn 12234 df-2 12303 df-n0 12505 df-z 12592 df-uz 12863 df-rp 13017 df-seq 14038 df-exp 14098 df-cj 15150 df-re 15151 df-im 15152 df-sqrt 15286 df-abs 15287 df-hnorm 31261 df-nmfn 32138 df-lnfn 32141 |
| This theorem is referenced by: nmbdfnlb 32343 branmfn 32398 |
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