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Theorem obsss 21855
Description: An orthonormal basis is a subset of the base set. (Contributed by Mario Carneiro, 23-Oct-2015.)
Hypothesis
Ref Expression
obsss.v 𝑉 = (Base‘𝑊)
Assertion
Ref Expression
obsss (𝐵 ∈ (OBasis‘𝑊) → 𝐵𝑉)

Proof of Theorem obsss
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 obsss.v . . 3 𝑉 = (Base‘𝑊)
2 eqid 2763 . . 3 (·𝑖𝑊) = (·𝑖𝑊)
3 eqid 2763 . . 3 (Scalar‘𝑊) = (Scalar‘𝑊)
4 eqid 2763 . . 3 (1r‘(Scalar‘𝑊)) = (1r‘(Scalar‘𝑊))
5 eqid 2763 . . 3 (0g‘(Scalar‘𝑊)) = (0g‘(Scalar‘𝑊))
6 eqid 2763 . . 3 (ocv‘𝑊) = (ocv‘𝑊)
7 eqid 2763 . . 3 (0g𝑊) = (0g𝑊)
81, 2, 3, 4, 5, 6, 7isobs 21851 . 2 (𝐵 ∈ (OBasis‘𝑊) ↔ (𝑊 ∈ PreHil ∧ 𝐵𝑉 ∧ (∀𝑥𝐵𝑦𝐵 (𝑥(·𝑖𝑊)𝑦) = if(𝑥 = 𝑦, (1r‘(Scalar‘𝑊)), (0g‘(Scalar‘𝑊))) ∧ ((ocv‘𝑊)‘𝐵) = {(0g𝑊)})))
98simp2bi 1164 1 (𝐵 ∈ (OBasis‘𝑊) → 𝐵𝑉)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 400   = wceq 1570  wcel 2143  wral 3079  wss 3906  ifcif 4488  {csn 4590  cfv 6538  (class class class)co 7412  Basecbs 17270  Scalarcsca 17314  ·𝑖cip 17316  0gc0g 17493  1rcur 20264  PreHilcphl 21755  ocvcocv 21791  OBasiscobs 21833
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5258  ax-nul 5270  ax-pow 5338  ax-pr 5406
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-pw 4565  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4874  df-br 5111  df-opab 5175  df-mpt 5194  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-ima 5676  df-iota 6494  df-fun 6540  df-fv 6546  df-ov 7415  df-obs 21836
This theorem is referenced by:  obsne0  21856  obselocv  21859  obslbs  21861
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