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Theorem obsss 21756
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 2761 . . 3 (·𝑖𝑊) = (·𝑖𝑊)
3 eqid 2761 . . 3 (Scalar‘𝑊) = (Scalar‘𝑊)
4 eqid 2761 . . 3 (1r‘(Scalar‘𝑊)) = (1r‘(Scalar‘𝑊))
5 eqid 2761 . . 3 (0g‘(Scalar‘𝑊)) = (0g‘(Scalar‘𝑊))
6 eqid 2761 . . 3 (ocv‘𝑊) = (ocv‘𝑊)
7 eqid 2761 . . 3 (0g𝑊) = (0g𝑊)
81, 2, 3, 4, 5, 6, 7isobs 21752 . 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 1158 1 (𝐵 ∈ (OBasis‘𝑊) → 𝐵𝑉)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399   = wceq 1559  wcel 2141  wral 3075  wss 3904  ifcif 4479  {csn 4581  cfv 6517  (class class class)co 7392  Basecbs 17228  Scalarcsca 17272  ·𝑖cip 17274  0gc0g 17451  1rcur 20210  PreHilcphl 21656  ocvcocv 21692  OBasiscobs 21734
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-sep 5245  ax-nul 5255  ax-pow 5321  ax-pr 5389
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3076  df-rex 3086  df-rab 3414  df-v 3455  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-br 5100  df-opab 5162  df-mpt 5181  df-id 5540  df-xp 5651  df-rel 5652  df-cnv 5653  df-co 5654  df-dm 5655  df-rn 5656  df-res 5657  df-ima 5658  df-iota 6473  df-fun 6519  df-fv 6525  df-ov 7395  df-obs 21737
This theorem is referenced by:  obsne0  21757  obselocv  21760  obslbs  21762
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