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Theorem obsocv 21693
Description: An orthonormal basis has trivial orthocomplement. (Contributed by Mario Carneiro, 23-Oct-2015.)
Hypotheses
Ref Expression
obsocv.z 0 = (0g𝑊)
obsocv.o = (ocv‘𝑊)
Assertion
Ref Expression
obsocv (𝐵 ∈ (OBasis‘𝑊) → ( 𝐵) = { 0 })

Proof of Theorem obsocv
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqid 2737 . . . 4 (Base‘𝑊) = (Base‘𝑊)
2 eqid 2737 . . . 4 (·𝑖𝑊) = (·𝑖𝑊)
3 eqid 2737 . . . 4 (Scalar‘𝑊) = (Scalar‘𝑊)
4 eqid 2737 . . . 4 (1r‘(Scalar‘𝑊)) = (1r‘(Scalar‘𝑊))
5 eqid 2737 . . . 4 (0g‘(Scalar‘𝑊)) = (0g‘(Scalar‘𝑊))
6 obsocv.o . . . 4 = (ocv‘𝑊)
7 obsocv.z . . . 4 0 = (0g𝑊)
81, 2, 3, 4, 5, 6, 7isobs 21687 . . 3 (𝐵 ∈ (OBasis‘𝑊) ↔ (𝑊 ∈ PreHil ∧ 𝐵 ⊆ (Base‘𝑊) ∧ (∀𝑥𝐵𝑦𝐵 (𝑥(·𝑖𝑊)𝑦) = if(𝑥 = 𝑦, (1r‘(Scalar‘𝑊)), (0g‘(Scalar‘𝑊))) ∧ ( 𝐵) = { 0 })))
98simp3bi 1148 . 2 (𝐵 ∈ (OBasis‘𝑊) → (∀𝑥𝐵𝑦𝐵 (𝑥(·𝑖𝑊)𝑦) = if(𝑥 = 𝑦, (1r‘(Scalar‘𝑊)), (0g‘(Scalar‘𝑊))) ∧ ( 𝐵) = { 0 }))
109simprd 495 1 (𝐵 ∈ (OBasis‘𝑊) → ( 𝐵) = { 0 })
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1542  wcel 2114  wral 3052  wss 3903  ifcif 4481  {csn 4582  cfv 6500  (class class class)co 7368  Basecbs 17148  Scalarcsca 17192  ·𝑖cip 17194  0gc0g 17371  1rcur 20128  PreHilcphl 21591  ocvcocv 21627  OBasiscobs 21669
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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5243  ax-nul 5253  ax-pow 5312  ax-pr 5379
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-pw 4558  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-iota 6456  df-fun 6502  df-fv 6508  df-ov 7371  df-obs 21672
This theorem is referenced by:  obs2ocv  21694  obs2ss  21696
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