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Theorem bcsiALT 28164
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 6229 . . 3 ((𝐴 ·ih 𝐵) = 0 → (abs‘(𝐴 ·ih 𝐵)) = (abs‘0))
2 abs0 14069 . . . 4 (abs‘0) = 0
3 bcs.1 . . . . . 6 𝐴 ∈ ℋ
4 normge0 28111 . . . . . 6 (𝐴 ∈ ℋ → 0 ≤ (norm𝐴))
53, 4ax-mp 5 . . . . 5 0 ≤ (norm𝐴)
6 bcs.2 . . . . . 6 𝐵 ∈ ℋ
7 normge0 28111 . . . . . 6 (𝐵 ∈ ℋ → 0 ≤ (norm𝐵))
86, 7ax-mp 5 . . . . 5 0 ≤ (norm𝐵)
93normcli 28116 . . . . . 6 (norm𝐴) ∈ ℝ
106normcli 28116 . . . . . 6 (norm𝐵) ∈ ℝ
119, 10mulge0i 10613 . . . . 5 ((0 ≤ (norm𝐴) ∧ 0 ≤ (norm𝐵)) → 0 ≤ ((norm𝐴) · (norm𝐵)))
125, 8, 11mp2an 708 . . . 4 0 ≤ ((norm𝐴) · (norm𝐵))
132, 12eqbrtri 4706 . . 3 (abs‘0) ≤ ((norm𝐴) · (norm𝐵))
141, 13syl6eqbr 4724 . 2 ((𝐴 ·ih 𝐵) = 0 → (abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵)))
15 df-ne 2824 . . . 4 ((𝐴 ·ih 𝐵) ≠ 0 ↔ ¬ (𝐴 ·ih 𝐵) = 0)
166, 3his1i 28085 . . . . . . . 8 (𝐵 ·ih 𝐴) = (∗‘(𝐴 ·ih 𝐵))
1716oveq2i 6701 . . . . . . 7 (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (𝐵 ·ih 𝐴)) = (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) · (∗‘(𝐴 ·ih 𝐵)))
1817oveq2i 6701 . . . . . 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 28066 . . . . . . 7 (𝐴 ·ih 𝐵) ∈ ℂ
20 abslem2 14123 . . . . . . 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 706 . . . . . 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, 21syl5req 2698 . . . . 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 14181 . . . . . . . 8 ((abs‘(𝐴 ·ih 𝐵)) = 0 ↔ (𝐴 ·ih 𝐵) = 0)
2423necon3bii 2875 . . . . . . 7 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 ↔ (𝐴 ·ih 𝐵) ≠ 0)
2519abscli 14178 . . . . . . . . . 10 (abs‘(𝐴 ·ih 𝐵)) ∈ ℝ
2625recni 10090 . . . . . . . . 9 (abs‘(𝐴 ·ih 𝐵)) ∈ ℂ
2719, 26divclzi 10798 . . . . . . . 8 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → ((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) ∈ ℂ)
2819, 26divreczi 10801 . . . . . . . . . 10 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → ((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) = ((𝐴 ·ih 𝐵) · (1 / (abs‘(𝐴 ·ih 𝐵)))))
2928fveq2d 6233 . . . . . . . . 9 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (abs‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) = (abs‘((𝐴 ·ih 𝐵) · (1 / (abs‘(𝐴 ·ih 𝐵))))))
3026recclzi 10788 . . . . . . . . . . 11 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (1 / (abs‘(𝐴 ·ih 𝐵))) ∈ ℂ)
31 absmul 14078 . . . . . . . . . . 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 696 . . . . . . . . . 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 10827 . . . . . . . . . . . 12 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (1 / (abs‘(𝐴 ·ih 𝐵))) ∈ ℝ)
34 0re 10078 . . . . . . . . . . . . . 14 0 ∈ ℝ
3533, 34jctil 559 . . . . . . . . . . . . 13 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (0 ∈ ℝ ∧ (1 / (abs‘(𝐴 ·ih 𝐵))) ∈ ℝ))
3619absgt0i 14182 . . . . . . . . . . . . . . 15 ((𝐴 ·ih 𝐵) ≠ 0 ↔ 0 < (abs‘(𝐴 ·ih 𝐵)))
3724, 36bitri 264 . . . . . . . . . . . . . 14 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 ↔ 0 < (abs‘(𝐴 ·ih 𝐵)))
3825recgt0i 10966 . . . . . . . . . . . . . 14 (0 < (abs‘(𝐴 ·ih 𝐵)) → 0 < (1 / (abs‘(𝐴 ·ih 𝐵))))
3937, 38sylbi 207 . . . . . . . . . . . . 13 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → 0 < (1 / (abs‘(𝐴 ·ih 𝐵))))
40 ltle 10164 . . . . . . . . . . . . 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 14205 . . . . . . . . . . 11 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (abs‘(1 / (abs‘(𝐴 ·ih 𝐵)))) = (1 / (abs‘(𝐴 ·ih 𝐵))))
4342oveq2d 6706 . . . . . . . . . 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 2685 . . . . . . . . 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 10790 . . . . . . . . 9 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → ((abs‘(𝐴 ·ih 𝐵)) · (1 / (abs‘(𝐴 ·ih 𝐵)))) = 1)
4629, 44, 453eqtrd 2689 . . . . . . . 8 ((abs‘(𝐴 ·ih 𝐵)) ≠ 0 → (abs‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) = 1)
4727, 46jca 553 . . . . . . 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 225 . . . . . 6 ((𝐴 ·ih 𝐵) ≠ 0 → (((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵))) ∈ ℂ ∧ (abs‘((𝐴 ·ih 𝐵) / (abs‘(𝐴 ·ih 𝐵)))) = 1))
493, 6normlem7tALT 28104 . . . . . 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 4707 . . . 4 ((𝐴 ·ih 𝐵) ≠ 0 → (2 · (abs‘(𝐴 ·ih 𝐵))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))))
5215, 51sylbir 225 . . 3 (¬ (𝐴 ·ih 𝐵) = 0 → (2 · (abs‘(𝐴 ·ih 𝐵))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))))
5310recni 10090 . . . . . 6 (norm𝐵) ∈ ℂ
549recni 10090 . . . . . 6 (norm𝐴) ∈ ℂ
55 normval 28109 . . . . . . . 8 (𝐵 ∈ ℋ → (norm𝐵) = (√‘(𝐵 ·ih 𝐵)))
566, 55ax-mp 5 . . . . . . 7 (norm𝐵) = (√‘(𝐵 ·ih 𝐵))
57 normval 28109 . . . . . . . 8 (𝐴 ∈ ℋ → (norm𝐴) = (√‘(𝐴 ·ih 𝐴)))
583, 57ax-mp 5 . . . . . . 7 (norm𝐴) = (√‘(𝐴 ·ih 𝐴))
5956, 58oveq12i 6702 . . . . . 6 ((norm𝐵) · (norm𝐴)) = ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))
6053, 54, 59mulcomli 10085 . . . . 5 ((norm𝐴) · (norm𝐵)) = ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))
6160breq2i 4693 . . . 4 ((abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵)) ↔ (abs‘(𝐴 ·ih 𝐵)) ≤ ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴))))
62 2pos 11150 . . . . 5 0 < 2
63 hiidge0 28083 . . . . . . . 8 (𝐵 ∈ ℋ → 0 ≤ (𝐵 ·ih 𝐵))
64 hiidrcl 28080 . . . . . . . . . 10 (𝐵 ∈ ℋ → (𝐵 ·ih 𝐵) ∈ ℝ)
656, 64ax-mp 5 . . . . . . . . 9 (𝐵 ·ih 𝐵) ∈ ℝ
6665sqrtcli 14155 . . . . . . . 8 (0 ≤ (𝐵 ·ih 𝐵) → (√‘(𝐵 ·ih 𝐵)) ∈ ℝ)
676, 63, 66mp2b 10 . . . . . . 7 (√‘(𝐵 ·ih 𝐵)) ∈ ℝ
68 hiidge0 28083 . . . . . . . 8 (𝐴 ∈ ℋ → 0 ≤ (𝐴 ·ih 𝐴))
69 hiidrcl 28080 . . . . . . . . . 10 (𝐴 ∈ ℋ → (𝐴 ·ih 𝐴) ∈ ℝ)
703, 69ax-mp 5 . . . . . . . . 9 (𝐴 ·ih 𝐴) ∈ ℝ
7170sqrtcli 14155 . . . . . . . 8 (0 ≤ (𝐴 ·ih 𝐴) → (√‘(𝐴 ·ih 𝐴)) ∈ ℝ)
723, 68, 71mp2b 10 . . . . . . 7 (√‘(𝐴 ·ih 𝐴)) ∈ ℝ
7367, 72remulcli 10092 . . . . . 6 ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴))) ∈ ℝ
74 2re 11128 . . . . . 6 2 ∈ ℝ
7525, 73, 74lemul2i 10985 . . . . 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 264 . . 3 ((abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵)) ↔ (2 · (abs‘(𝐴 ·ih 𝐵))) ≤ (2 · ((√‘(𝐵 ·ih 𝐵)) · (√‘(𝐴 ·ih 𝐴)))))
7852, 77sylibr 224 . 2 (¬ (𝐴 ·ih 𝐵) = 0 → (abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵)))
7914, 78pm2.61i 176 1 (abs‘(𝐴 ·ih 𝐵)) ≤ ((norm𝐴) · (norm𝐵))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wb 196  wa 383   = wceq 1523  wcel 2030  wne 2823   class class class wbr 4685  cfv 5926  (class class class)co 6690  cc 9972  cr 9973  0cc0 9974  1c1 9975   + caddc 9977   · cmul 9979   < clt 10112  cle 10113   / cdiv 10722  2c2 11108  ccj 13880  csqrt 14017  abscabs 14018  chil 27904   ·ih csp 27907  normcno 27908
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-cnex 10030  ax-resscn 10031  ax-1cn 10032  ax-icn 10033  ax-addcl 10034  ax-addrcl 10035  ax-mulcl 10036  ax-mulrcl 10037  ax-mulcom 10038  ax-addass 10039  ax-mulass 10040  ax-distr 10041  ax-i2m1 10042  ax-1ne0 10043  ax-1rid 10044  ax-rnegex 10045  ax-rrecex 10046  ax-cnre 10047  ax-pre-lttri 10048  ax-pre-lttrn 10049  ax-pre-ltadd 10050  ax-pre-mulgt0 10051  ax-pre-sup 10052  ax-hfvadd 27985  ax-hv0cl 27988  ax-hfvmul 27990  ax-hvmulass 27992  ax-hvmul0 27995  ax-hfi 28064  ax-his1 28067  ax-his2 28068  ax-his3 28069  ax-his4 28070
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-nel 2927  df-ral 2946  df-rex 2947  df-reu 2948  df-rmo 2949  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-er 7787  df-en 7998  df-dom 7999  df-sdom 8000  df-sup 8389  df-pnf 10114  df-mnf 10115  df-xr 10116  df-ltxr 10117  df-le 10118  df-sub 10306  df-neg 10307  df-div 10723  df-nn 11059  df-2 11117  df-3 11118  df-4 11119  df-n0 11331  df-z 11416  df-uz 11726  df-rp 11871  df-seq 12842  df-exp 12901  df-cj 13883  df-re 13884  df-im 13885  df-sqrt 14019  df-abs 14020  df-hnorm 27953  df-hvsub 27956
This theorem is referenced by: (None)
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