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Theorem bcsiALT 29537
Description: Bunjakovaskij-Cauchy-Schwarz inequality. Remark 3.4 of [Beran] p. 98. (Contributed by NM, 11-Oct-1999.) (New usage is discouraged.) (Proof modification is discouraged.)
Hypotheses
Ref Expression
bcs.1 𝐴 ∈ ℋ
bcs.2 𝐵 ∈ ℋ
Assertion
Ref Expression
bcsiALT (abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵))

Proof of Theorem bcsiALT
StepHypRef Expression
1 fveq2 6771 . . 3 ((𝐴 ·ih 𝐵) = 0 → (abs‘(𝐴 ·ih 𝐵)) = (abs‘0))
2 abs0 14995 . . . 4 (abs‘0) = 0
3 bcs.1 . . . . . 6 𝐴 ∈ ℋ
4 normge0 29484 . . . . . 6 (𝐴 ∈ ℋ → 0 ≤ (norm𝐴))
53, 4ax-mp 5 . . . . 5 0 ≤ (norm𝐴)
6 bcs.2 . . . . . 6 𝐵 ∈ ℋ
7 normge0 29484 . . . . . 6 (𝐵 ∈ ℋ → 0 ≤ (norm𝐵))
86, 7ax-mp 5 . . . . 5 0 ≤ (norm𝐵)
93normcli 29489 . . . . . 6 (norm𝐴) ∈ ℝ
106normcli 29489 . . . . . 6 (norm𝐵) ∈ ℝ
119, 10mulge0i 11522 . . . . 5 ((0 ≤ (norm𝐴) ∧ 0 ≤ (norm𝐵)) → 0 ≤ ((norm𝐴) · (norm𝐵)))
125, 8, 11mp2an 689 . . . 4 0 ≤ ((norm𝐴) · (norm𝐵))
132, 12eqbrtri 5100 . . 3 (abs‘0) ≤ ((norm𝐴) · (norm𝐵))
141, 13eqbrtrdi 5118 . 2 ((𝐴 ·ih 𝐵) = 0 → (abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵)))
15 df-ne 2946 . . . 4 ((𝐴 ·ih 𝐵) ≠ 0 ↔ ¬ (𝐴 ·ih 𝐵) = 0)
166, 3his1i 29458 . . . . . . . 8 (𝐵 ·ih 𝐴) = (∗‘(𝐴 ·ih 𝐵))
1716oveq2i 7282 . . . . . . 7 (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (𝐵 ·ih 𝐴)) = (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (∗‘(𝐴 ·ih 𝐵)))
1817oveq2i 7282 . . . . . 6 (((∗‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) · (𝐴 ·ih 𝐵)) + (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (𝐵 ·ih 𝐴))) = (((∗‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) · (𝐴 ·ih 𝐵)) + (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (∗‘(𝐴 ·ih 𝐵))))
193, 6hicli 29439 . . . . . . 7 (𝐴 ·ih 𝐵) ∈ ℂ
20 abslem2 15049 . . . . . . 7 (((𝐴 ·ih 𝐵) ∈ ℂ ∧ (𝐴 ·ih 𝐵) ≠ 0) → (((∗‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) · (𝐴 ·ih 𝐵)) + (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (∗‘(𝐴 ·ih 𝐵)))) = (2 · (abs‘(𝐴 ·ih 𝐵))))
2119, 20mpan 687 . . . . . 6 ((𝐴 ·ih 𝐵) ≠ 0 → (((∗‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) · (𝐴 ·ih 𝐵)) + (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (∗‘(𝐴 ·ih 𝐵)))) = (2 · (abs‘(𝐴 ·ih 𝐵))))
2218, 21eqtr2id 2793 . . . . 5 ((𝐴 ·ih 𝐵) ≠ 0 → (2 · (abs‘(𝐴 ·ih 𝐵))) = (((∗‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) · (𝐴 ·ih 𝐵)) + (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (𝐵 ·ih 𝐴))))
2319abs00i 15108 . . . . . . . 8 ((abs‘(𝐴 ·ih 𝐵)) = 0 ↔ (𝐴 ·ih 𝐵) = 0)
2423necon3bii 2998 . . . . . . 7 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 ↔ (𝐴 ·ih 𝐵) ≠ 0)
2519abscli 15105 . . . . . . . . . 10 (abs‘(𝐴 ·ih 𝐵)) ∈ ℝ
2625recni 10990 . . . . . . . . 9 (abs‘(𝐴 ·ih 𝐵)) ∈ ℂ
2719, 26divclzi 11710 . . . . . . . 8 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → ((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) ∈ ℂ)
2819, 26divreczi 11713 . . . . . . . . . 10 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → ((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) = ((𝐴 ·ih 𝐵) · (1 / (abs‘(𝐴 ·ih 𝐵)))))
2928fveq2d 6775 . . . . . . . . 9 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (abs‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) = (abs‘((𝐴 ·ih 𝐵) · (1 / (abs‘(𝐴 ·ih 𝐵))))))
3026recclzi 11700 . . . . . . . . . . 11 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (1 / (abs‘(𝐴 ·ih 𝐵))) ∈ ℂ)
31 absmul 15004 . . . . . . . . . . 11 (((𝐴 ·ih 𝐵) ∈ ℂ ∧ (1 / (abs‘(𝐴 ·ih 𝐵))) ∈ ℂ) → (abs‘((𝐴 ·ih 𝐵) · (1 / (abs‘(𝐴 ·ih 𝐵))))) = ((abs‘(𝐴 ·ih 𝐵)) · (abs‘(1 / (abs‘(𝐴 ·ih 𝐵))))))
3219, 30, 31sylancr 587 . . . . . . . . . 10 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (abs‘((𝐴 ·ih 𝐵) · (1 / (abs‘(𝐴 ·ih 𝐵))))) = ((abs‘(𝐴 ·ih 𝐵)) · (abs‘(1 / (abs‘(𝐴 ·ih 𝐵))))))
3325rerecclzi 11739 . . . . . . . . . . . 12 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (1 / (abs‘(𝐴 ·ih 𝐵))) ∈ ℝ)
34 0re 10978 . . . . . . . . . . . . . 14 0 ∈ ℝ
3533, 34jctil 520 . . . . . . . . . . . . 13 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (0 ∈ ℝ ∧ (1 / (abs‘(𝐴 ·ih 𝐵))) ∈ ℝ))
3619absgt0i 15109 . . . . . . . . . . . . . . 15 ((𝐴 ·ih 𝐵) ≠ 0 ↔ 0 < (abs‘(𝐴 ·ih 𝐵)))
3724, 36bitri 274 . . . . . . . . . . . . . 14 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 ↔ 0 < (abs‘(𝐴 ·ih 𝐵)))
3825recgt0i 11880 . . . . . . . . . . . . . 14 (0 < (abs‘(𝐴 ·ih 𝐵)) → 0 < (1 / (abs‘(𝐴 ·ih 𝐵))))
3937, 38sylbi 216 . . . . . . . . . . . . 13 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → 0 < (1 / (abs‘(𝐴 ·ih 𝐵))))
40 ltle 11064 . . . . . . . . . . . . 13 ((0 ∈ ℝ ∧ (1 / (abs‘(𝐴 ·ih 𝐵))) ∈ ℝ) → (0 < (1 / (abs‘(𝐴 ·ih 𝐵))) → 0 ≤ (1 / (abs‘(𝐴 ·ih 𝐵)))))
4135, 39, 40sylc 65 . . . . . . . . . . . 12 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → 0 ≤ (1 / (abs‘(𝐴 ·ih 𝐵))))
4233, 41absidd 15132 . . . . . . . . . . 11 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (abs‘(1 / (abs‘(𝐴 ·ih 𝐵)))) = (1 / (abs‘(𝐴 ·ih 𝐵))))
4342oveq2d 7287 . . . . . . . . . 10 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → ((abs‘(𝐴 ·ih 𝐵)) · (abs‘(1 / (abs‘(𝐴 ·ih 𝐵))))) = ((abs‘(𝐴 ·ih 𝐵)) · (1 / (abs‘(𝐴 ·ih 𝐵)))))
4432, 43eqtrd 2780 . . . . . . . . 9 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (abs‘((𝐴 ·ih 𝐵) · (1 / (abs‘(𝐴 ·ih 𝐵))))) = ((abs‘(𝐴 ·ih 𝐵)) · (1 / (abs‘(𝐴 ·ih 𝐵)))))
4526recidzi 11702 . . . . . . . . 9 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → ((abs‘(𝐴 ·ih 𝐵)) · (1 / (abs‘(𝐴 ·ih 𝐵)))) = 1)
4629, 44, 453eqtrd 2784 . . . . . . . 8 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (abs‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) = 1)
4727, 46jca 512 . . . . . . 7 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) ∈ ℂ ∧ (abs‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) = 1))
4824, 47sylbir 234 . . . . . 6 ((𝐴 ·ih 𝐵) ≠ 0 → (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) ∈ ℂ ∧ (abs‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) = 1))
493, 6normlem7tALT 29477 . . . . . 6 ((((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) ∈ ℂ ∧ (abs‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) = 1) → (((∗‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) · (𝐴 ·ih 𝐵)) + (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (𝐵 ·ih 𝐴))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))))
5048, 49syl 17 . . . . 5 ((𝐴 ·ih 𝐵) ≠ 0 → (((∗‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) · (𝐴 ·ih 𝐵)) + (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (𝐵 ·ih 𝐴))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))))
5122, 50eqbrtrd 5101 . . . 4 ((𝐴 ·ih 𝐵) ≠ 0 → (2 · (abs‘(𝐴 ·ih 𝐵))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))))
5215, 51sylbir 234 . . 3 (¬ (𝐴 ·ih 𝐵) = 0 → (2 · (abs‘(𝐴 ·ih 𝐵))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))))
5310recni 10990 . . . . . 6 (norm𝐵) ∈ ℂ
549recni 10990 . . . . . 6 (norm𝐴) ∈ ℂ
55 normval 29482 . . . . . . . 8 (𝐵 ∈ ℋ → (norm𝐵) = (√‘(𝐵 ·ih 𝐵)))
566, 55ax-mp 5 . . . . . . 7 (norm𝐵) = (√‘(𝐵 ·ih 𝐵))
57 normval 29482 . . . . . . . 8 (𝐴 ∈ ℋ → (norm𝐴) = (√‘(𝐴 ·ih 𝐴)))
583, 57ax-mp 5 . . . . . . 7 (norm𝐴) = (√‘(𝐴 ·ih 𝐴))
5956, 58oveq12i 7283 . . . . . 6 ((norm𝐵) · (norm𝐴)) = ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))
6053, 54, 59mulcomli 10985 . . . . 5 ((norm𝐴) · (norm𝐵)) = ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))
6160breq2i 5087 . . . 4 ((abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵)) ↔ (abs‘(𝐴 ·ih 𝐵)) ≤ ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴))))
62 2pos 12076 . . . . 5 0 < 2
63 hiidge0 29456 . . . . . . . 8 (𝐵 ∈ ℋ → 0 ≤ (𝐵 ·ih 𝐵))
64 hiidrcl 29453 . . . . . . . . . 10 (𝐵 ∈ ℋ → (𝐵 ·ih 𝐵) ∈ ℝ)
656, 64ax-mp 5 . . . . . . . . 9 (𝐵 ·ih 𝐵) ∈ ℝ
6665sqrtcli 15081 . . . . . . . 8 (0 ≤ (𝐵 ·ih 𝐵) → (√‘(𝐵 ·ih 𝐵)) ∈ ℝ)
676, 63, 66mp2b 10 . . . . . . 7 (√‘(𝐵 ·ih 𝐵)) ∈ ℝ
68 hiidge0 29456 . . . . . . . 8 (𝐴 ∈ ℋ → 0 ≤ (𝐴 ·ih 𝐴))
69 hiidrcl 29453 . . . . . . . . . 10 (𝐴 ∈ ℋ → (𝐴 ·ih 𝐴) ∈ ℝ)
703, 69ax-mp 5 . . . . . . . . 9 (𝐴 ·ih 𝐴) ∈ ℝ
7170sqrtcli 15081 . . . . . . . 8 (0 ≤ (𝐴 ·ih 𝐴) → (√‘(𝐴 ·ih 𝐴)) ∈ ℝ)
723, 68, 71mp2b 10 . . . . . . 7 (√‘(𝐴 ·ih 𝐴)) ∈ ℝ
7367, 72remulcli 10992 . . . . . 6 ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴))) ∈ ℝ
74 2re 12047 . . . . . 6 2 ∈ ℝ
7525, 73, 74lemul2i 11898 . . . . 5 (0 < 2 → ((abs‘(𝐴 ·ih 𝐵)) ≤ ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴))) ↔ (2 · (abs‘(𝐴 ·ih 𝐵))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴))))))
7662, 75ax-mp 5 . . . 4 ((abs‘(𝐴 ·ih 𝐵)) ≤ ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴))) ↔ (2 · (abs‘(𝐴 ·ih 𝐵))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))))
7761, 76bitri 274 . . 3 ((abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵)) ↔ (2 · (abs‘(𝐴 ·ih 𝐵))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))))
7852, 77sylibr 233 . 2 (¬ (𝐴 ·ih 𝐵) = 0 → (abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵)))
7914, 78pm2.61i 182 1 (abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wb 205  wa 396   = wceq 1542  wcel 2110  wne 2945   class class class wbr 5079  cfv 6432  (class class class)co 7271  cc 10870  cr 10871  0cc0 10872  1c1 10873   + caddc 10875   · cmul 10877   < clt 11010  cle 11011   / cdiv 11632  2c2 12028  ccj 14805  csqrt 14942  abscabs 14943  chba 29277   ·ih csp 29280  normcno 29281
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2015  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2711  ax-sep 5227  ax-nul 5234  ax-pow 5292  ax-pr 5356  ax-un 7582  ax-cnex 10928  ax-resscn 10929  ax-1cn 10930  ax-icn 10931  ax-addcl 10932  ax-addrcl 10933  ax-mulcl 10934  ax-mulrcl 10935  ax-mulcom 10936  ax-addass 10937  ax-mulass 10938  ax-distr 10939  ax-i2m1 10940  ax-1ne0 10941  ax-1rid 10942  ax-rnegex 10943  ax-rrecex 10944  ax-cnre 10945  ax-pre-lttri 10946  ax-pre-lttrn 10947  ax-pre-ltadd 10948  ax-pre-mulgt0 10949  ax-pre-sup 10950  ax-hfvadd 29358  ax-hv0cl 29361  ax-hfvmul 29363  ax-hvmulass 29365  ax-hvmul0 29368  ax-hfi 29437  ax-his1 29440  ax-his2 29441  ax-his3 29442  ax-his4 29443
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2072  df-mo 2542  df-eu 2571  df-clab 2718  df-cleq 2732  df-clel 2818  df-nfc 2891  df-ne 2946  df-nel 3052  df-ral 3071  df-rex 3072  df-reu 3073  df-rmo 3074  df-rab 3075  df-v 3433  df-sbc 3721  df-csb 3838  df-dif 3895  df-un 3897  df-in 3899  df-ss 3909  df-pss 3911  df-nul 4263  df-if 4466  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4846  df-iun 4932  df-br 5080  df-opab 5142  df-mpt 5163  df-tr 5197  df-id 5490  df-eprel 5496  df-po 5504  df-so 5505  df-fr 5545  df-we 5547  df-xp 5596  df-rel 5597  df-cnv 5598  df-co 5599  df-dm 5600  df-rn 5601  df-res 5602  df-ima 5603  df-pred 6201  df-ord 6268  df-on 6269  df-lim 6270  df-suc 6271  df-iota 6390  df-fun 6434  df-fn 6435  df-f 6436  df-f1 6437  df-fo 6438  df-f1o 6439  df-fv 6440  df-riota 7228  df-ov 7274  df-oprab 7275  df-mpo 7276  df-om 7707  df-2nd 7825  df-frecs 8088  df-wrecs 8119  df-recs 8193  df-rdg 8232  df-er 8481  df-en 8717  df-dom 8718  df-sdom 8719  df-sup 9179  df-pnf 11012  df-mnf 11013  df-xr 11014  df-ltxr 11015  df-le 11016  df-sub 11207  df-neg 11208  df-div 11633  df-nn 11974  df-2 12036  df-3 12037  df-4 12038  df-n0 12234  df-z 12320  df-uz 12582  df-rp 12730  df-seq 13720  df-exp 13781  df-cj 14808  df-re 14809  df-im 14810  df-sqrt 14944  df-abs 14945  df-hnorm 29326  df-hvsub 29329
This theorem is referenced by: (None)
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