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Theorem strlem1 30132
 Description: Lemma for strong state theorem: if closed subspace 𝐴 is not contained in 𝐵, there is a unit vector 𝑢 in their difference. (Contributed by NM, 25-Oct-1999.) (New usage is discouraged.)
Hypotheses
Ref Expression
strlem1.1 𝐴C
strlem1.2 𝐵C
Assertion
Ref Expression
strlem1 𝐴𝐵 → ∃𝑢 ∈ (𝐴𝐵)(norm𝑢) = 1)
Distinct variable groups:   𝑢,𝐴   𝑢,𝐵

Proof of Theorem strlem1
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 neq0 4244 . . 3 (¬ (𝐴𝐵) = ∅ ↔ ∃𝑥 𝑥 ∈ (𝐴𝐵))
2 ssdif0 4262 . . 3 (𝐴𝐵 ↔ (𝐴𝐵) = ∅)
31, 2xchnxbir 336 . 2 𝐴𝐵 ↔ ∃𝑥 𝑥 ∈ (𝐴𝐵))
4 eldifi 4032 . . . . . . . . . . 11 (𝑥 ∈ (𝐴𝐵) → 𝑥𝐴)
5 strlem1.1 . . . . . . . . . . . 12 𝐴C
65cheli 29114 . . . . . . . . . . 11 (𝑥𝐴𝑥 ∈ ℋ)
7 normcl 29007 . . . . . . . . . . 11 (𝑥 ∈ ℋ → (norm𝑥) ∈ ℝ)
84, 6, 73syl 18 . . . . . . . . . 10 (𝑥 ∈ (𝐴𝐵) → (norm𝑥) ∈ ℝ)
9 strlem1.2 . . . . . . . . . . . . . . . 16 𝐵C
10 ch0 29110 . . . . . . . . . . . . . . . 16 (𝐵C → 0𝐵)
119, 10ax-mp 5 . . . . . . . . . . . . . . 15 0𝐵
12 eldifn 4033 . . . . . . . . . . . . . . 15 (0 ∈ (𝐴𝐵) → ¬ 0𝐵)
1311, 12mt2 203 . . . . . . . . . . . . . 14 ¬ 0 ∈ (𝐴𝐵)
14 eleq1 2839 . . . . . . . . . . . . . 14 (𝑥 = 0 → (𝑥 ∈ (𝐴𝐵) ↔ 0 ∈ (𝐴𝐵)))
1513, 14mtbiri 330 . . . . . . . . . . . . 13 (𝑥 = 0 → ¬ 𝑥 ∈ (𝐴𝐵))
1615con2i 141 . . . . . . . . . . . 12 (𝑥 ∈ (𝐴𝐵) → ¬ 𝑥 = 0)
17 norm-i 29011 . . . . . . . . . . . . 13 (𝑥 ∈ ℋ → ((norm𝑥) = 0 ↔ 𝑥 = 0))
184, 6, 173syl 18 . . . . . . . . . . . 12 (𝑥 ∈ (𝐴𝐵) → ((norm𝑥) = 0 ↔ 𝑥 = 0))
1916, 18mtbird 328 . . . . . . . . . . 11 (𝑥 ∈ (𝐴𝐵) → ¬ (norm𝑥) = 0)
2019neqned 2958 . . . . . . . . . 10 (𝑥 ∈ (𝐴𝐵) → (norm𝑥) ≠ 0)
218, 20rereccld 11505 . . . . . . . . 9 (𝑥 ∈ (𝐴𝐵) → (1 / (norm𝑥)) ∈ ℝ)
2221recnd 10707 . . . . . . . 8 (𝑥 ∈ (𝐴𝐵) → (1 / (norm𝑥)) ∈ ℂ)
235chshii 29109 . . . . . . . . . 10 𝐴S
24 shmulcl 29100 . . . . . . . . . 10 ((𝐴S ∧ (1 / (norm𝑥)) ∈ ℂ ∧ 𝑥𝐴) → ((1 / (norm𝑥)) · 𝑥) ∈ 𝐴)
2523, 24mp3an1 1445 . . . . . . . . 9 (((1 / (norm𝑥)) ∈ ℂ ∧ 𝑥𝐴) → ((1 / (norm𝑥)) · 𝑥) ∈ 𝐴)
2625ex 416 . . . . . . . 8 ((1 / (norm𝑥)) ∈ ℂ → (𝑥𝐴 → ((1 / (norm𝑥)) · 𝑥) ∈ 𝐴))
2722, 26syl 17 . . . . . . 7 (𝑥 ∈ (𝐴𝐵) → (𝑥𝐴 → ((1 / (norm𝑥)) · 𝑥) ∈ 𝐴))
288recnd 10707 . . . . . . . . . 10 (𝑥 ∈ (𝐴𝐵) → (norm𝑥) ∈ ℂ)
299chshii 29109 . . . . . . . . . . . 12 𝐵S
30 shmulcl 29100 . . . . . . . . . . . 12 ((𝐵S ∧ (norm𝑥) ∈ ℂ ∧ ((1 / (norm𝑥)) · 𝑥) ∈ 𝐵) → ((norm𝑥) · ((1 / (norm𝑥)) · 𝑥)) ∈ 𝐵)
3129, 30mp3an1 1445 . . . . . . . . . . 11 (((norm𝑥) ∈ ℂ ∧ ((1 / (norm𝑥)) · 𝑥) ∈ 𝐵) → ((norm𝑥) · ((1 / (norm𝑥)) · 𝑥)) ∈ 𝐵)
3231ex 416 . . . . . . . . . 10 ((norm𝑥) ∈ ℂ → (((1 / (norm𝑥)) · 𝑥) ∈ 𝐵 → ((norm𝑥) · ((1 / (norm𝑥)) · 𝑥)) ∈ 𝐵))
3328, 32syl 17 . . . . . . . . 9 (𝑥 ∈ (𝐴𝐵) → (((1 / (norm𝑥)) · 𝑥) ∈ 𝐵 → ((norm𝑥) · ((1 / (norm𝑥)) · 𝑥)) ∈ 𝐵))
3428, 20recidd 11449 . . . . . . . . . . . 12 (𝑥 ∈ (𝐴𝐵) → ((norm𝑥) · (1 / (norm𝑥))) = 1)
3534oveq1d 7165 . . . . . . . . . . 11 (𝑥 ∈ (𝐴𝐵) → (((norm𝑥) · (1 / (norm𝑥))) · 𝑥) = (1 · 𝑥))
364, 6syl 17 . . . . . . . . . . . 12 (𝑥 ∈ (𝐴𝐵) → 𝑥 ∈ ℋ)
37 ax-hvmulass 28889 . . . . . . . . . . . 12 (((norm𝑥) ∈ ℂ ∧ (1 / (norm𝑥)) ∈ ℂ ∧ 𝑥 ∈ ℋ) → (((norm𝑥) · (1 / (norm𝑥))) · 𝑥) = ((norm𝑥) · ((1 / (norm𝑥)) · 𝑥)))
3828, 22, 36, 37syl3anc 1368 . . . . . . . . . . 11 (𝑥 ∈ (𝐴𝐵) → (((norm𝑥) · (1 / (norm𝑥))) · 𝑥) = ((norm𝑥) · ((1 / (norm𝑥)) · 𝑥)))
39 ax-hvmulid 28888 . . . . . . . . . . . 12 (𝑥 ∈ ℋ → (1 · 𝑥) = 𝑥)
404, 6, 393syl 18 . . . . . . . . . . 11 (𝑥 ∈ (𝐴𝐵) → (1 · 𝑥) = 𝑥)
4135, 38, 403eqtr3d 2801 . . . . . . . . . 10 (𝑥 ∈ (𝐴𝐵) → ((norm𝑥) · ((1 / (norm𝑥)) · 𝑥)) = 𝑥)
4241eleq1d 2836 . . . . . . . . 9 (𝑥 ∈ (𝐴𝐵) → (((norm𝑥) · ((1 / (norm𝑥)) · 𝑥)) ∈ 𝐵𝑥𝐵))
4333, 42sylibd 242 . . . . . . . 8 (𝑥 ∈ (𝐴𝐵) → (((1 / (norm𝑥)) · 𝑥) ∈ 𝐵𝑥𝐵))
4443con3d 155 . . . . . . 7 (𝑥 ∈ (𝐴𝐵) → (¬ 𝑥𝐵 → ¬ ((1 / (norm𝑥)) · 𝑥) ∈ 𝐵))
4527, 44anim12d 611 . . . . . 6 (𝑥 ∈ (𝐴𝐵) → ((𝑥𝐴 ∧ ¬ 𝑥𝐵) → (((1 / (norm𝑥)) · 𝑥) ∈ 𝐴 ∧ ¬ ((1 / (norm𝑥)) · 𝑥) ∈ 𝐵)))
46 eldif 3868 . . . . . 6 (𝑥 ∈ (𝐴𝐵) ↔ (𝑥𝐴 ∧ ¬ 𝑥𝐵))
47 eldif 3868 . . . . . 6 (((1 / (norm𝑥)) · 𝑥) ∈ (𝐴𝐵) ↔ (((1 / (norm𝑥)) · 𝑥) ∈ 𝐴 ∧ ¬ ((1 / (norm𝑥)) · 𝑥) ∈ 𝐵))
4845, 46, 473imtr4g 299 . . . . 5 (𝑥 ∈ (𝐴𝐵) → (𝑥 ∈ (𝐴𝐵) → ((1 / (norm𝑥)) · 𝑥) ∈ (𝐴𝐵)))
4948pm2.43i 52 . . . 4 (𝑥 ∈ (𝐴𝐵) → ((1 / (norm𝑥)) · 𝑥) ∈ (𝐴𝐵))
50 norm-iii 29022 . . . . . 6 (((1 / (norm𝑥)) ∈ ℂ ∧ 𝑥 ∈ ℋ) → (norm‘((1 / (norm𝑥)) · 𝑥)) = ((abs‘(1 / (norm𝑥))) · (norm𝑥)))
5122, 36, 50syl2anc 587 . . . . 5 (𝑥 ∈ (𝐴𝐵) → (norm‘((1 / (norm𝑥)) · 𝑥)) = ((abs‘(1 / (norm𝑥))) · (norm𝑥)))
5215necon2ai 2980 . . . . . . . . 9 (𝑥 ∈ (𝐴𝐵) → 𝑥 ≠ 0)
53 normgt0 29009 . . . . . . . . . 10 (𝑥 ∈ ℋ → (𝑥 ≠ 0 ↔ 0 < (norm𝑥)))
544, 6, 533syl 18 . . . . . . . . 9 (𝑥 ∈ (𝐴𝐵) → (𝑥 ≠ 0 ↔ 0 < (norm𝑥)))
5552, 54mpbid 235 . . . . . . . 8 (𝑥 ∈ (𝐴𝐵) → 0 < (norm𝑥))
56 1re 10679 . . . . . . . . 9 1 ∈ ℝ
57 0le1 11201 . . . . . . . . 9 0 ≤ 1
58 divge0 11547 . . . . . . . . 9 (((1 ∈ ℝ ∧ 0 ≤ 1) ∧ ((norm𝑥) ∈ ℝ ∧ 0 < (norm𝑥))) → 0 ≤ (1 / (norm𝑥)))
5956, 57, 58mpanl12 701 . . . . . . . 8 (((norm𝑥) ∈ ℝ ∧ 0 < (norm𝑥)) → 0 ≤ (1 / (norm𝑥)))
608, 55, 59syl2anc 587 . . . . . . 7 (𝑥 ∈ (𝐴𝐵) → 0 ≤ (1 / (norm𝑥)))
6121, 60absidd 14830 . . . . . 6 (𝑥 ∈ (𝐴𝐵) → (abs‘(1 / (norm𝑥))) = (1 / (norm𝑥)))
6261oveq1d 7165 . . . . 5 (𝑥 ∈ (𝐴𝐵) → ((abs‘(1 / (norm𝑥))) · (norm𝑥)) = ((1 / (norm𝑥)) · (norm𝑥)))
6328, 20recid2d 11450 . . . . 5 (𝑥 ∈ (𝐴𝐵) → ((1 / (norm𝑥)) · (norm𝑥)) = 1)
6451, 62, 633eqtrd 2797 . . . 4 (𝑥 ∈ (𝐴𝐵) → (norm‘((1 / (norm𝑥)) · 𝑥)) = 1)
65 fveqeq2 6667 . . . . 5 (𝑢 = ((1 / (norm𝑥)) · 𝑥) → ((norm𝑢) = 1 ↔ (norm‘((1 / (norm𝑥)) · 𝑥)) = 1))
6665rspcev 3541 . . . 4 ((((1 / (norm𝑥)) · 𝑥) ∈ (𝐴𝐵) ∧ (norm‘((1 / (norm𝑥)) · 𝑥)) = 1) → ∃𝑢 ∈ (𝐴𝐵)(norm𝑢) = 1)
6749, 64, 66syl2anc 587 . . 3 (𝑥 ∈ (𝐴𝐵) → ∃𝑢 ∈ (𝐴𝐵)(norm𝑢) = 1)
6867exlimiv 1931 . 2 (∃𝑥 𝑥 ∈ (𝐴𝐵) → ∃𝑢 ∈ (𝐴𝐵)(norm𝑢) = 1)
693, 68sylbi 220 1 𝐴𝐵 → ∃𝑢 ∈ (𝐴𝐵)(norm𝑢) = 1)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 399   = wceq 1538  ∃wex 1781   ∈ wcel 2111   ≠ wne 2951  ∃wrex 3071   ∖ cdif 3855   ⊆ wss 3858  ∅c0 4225   class class class wbr 5032  ‘cfv 6335  (class class class)co 7150  ℂcc 10573  ℝcr 10574  0cc0 10575  1c1 10576   · cmul 10580   < clt 10713   ≤ cle 10714   / cdiv 11335  abscabs 14641   ℋchba 28801   ·ℎ csm 28803  normℎcno 28805  0ℎc0v 28806   Sℋ csh 28810   Cℋ cch 28811 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-sep 5169  ax-nul 5176  ax-pow 5234  ax-pr 5298  ax-un 7459  ax-cnex 10631  ax-resscn 10632  ax-1cn 10633  ax-icn 10634  ax-addcl 10635  ax-addrcl 10636  ax-mulcl 10637  ax-mulrcl 10638  ax-mulcom 10639  ax-addass 10640  ax-mulass 10641  ax-distr 10642  ax-i2m1 10643  ax-1ne0 10644  ax-1rid 10645  ax-rnegex 10646  ax-rrecex 10647  ax-cnre 10648  ax-pre-lttri 10649  ax-pre-lttrn 10650  ax-pre-ltadd 10651  ax-pre-mulgt0 10652  ax-pre-sup 10653  ax-hilex 28881  ax-hfvadd 28882  ax-hv0cl 28885  ax-hfvmul 28887  ax-hvmulid 28888  ax-hvmulass 28889  ax-hvmul0 28892  ax-hfi 28961  ax-his1 28964  ax-his3 28966  ax-his4 28967 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-nel 3056  df-ral 3075  df-rex 3076  df-reu 3077  df-rmo 3078  df-rab 3079  df-v 3411  df-sbc 3697  df-csb 3806  df-dif 3861  df-un 3863  df-in 3865  df-ss 3875  df-pss 3877  df-nul 4226  df-if 4421  df-pw 4496  df-sn 4523  df-pr 4525  df-tp 4527  df-op 4529  df-uni 4799  df-iun 4885  df-br 5033  df-opab 5095  df-mpt 5113  df-tr 5139  df-id 5430  df-eprel 5435  df-po 5443  df-so 5444  df-fr 5483  df-we 5485  df-xp 5530  df-rel 5531  df-cnv 5532  df-co 5533  df-dm 5534  df-rn 5535  df-res 5536  df-ima 5537  df-pred 6126  df-ord 6172  df-on 6173  df-lim 6174  df-suc 6175  df-iota 6294  df-fun 6337  df-fn 6338  df-f 6339  df-f1 6340  df-fo 6341  df-f1o 6342  df-fv 6343  df-riota 7108  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7580  df-2nd 7694  df-wrecs 7957  df-recs 8018  df-rdg 8056  df-er 8299  df-en 8528  df-dom 8529  df-sdom 8530  df-sup 8939  df-pnf 10715  df-mnf 10716  df-xr 10717  df-ltxr 10718  df-le 10719  df-sub 10910  df-neg 10911  df-div 11336  df-nn 11675  df-2 11737  df-3 11738  df-n0 11935  df-z 12021  df-uz 12283  df-rp 12431  df-seq 13419  df-exp 13480  df-cj 14506  df-re 14507  df-im 14508  df-sqrt 14642  df-abs 14643  df-hnorm 28850  df-sh 29089  df-ch 29103 This theorem is referenced by:  stri  30139  hstri  30147
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