Orthonormal system close to Orthonormal basis is basis.
133609
orthonormal system in a Hilbert space
16692
a representation condition of Hilbert space
63465
Orthogonal Projection of $ z $ onto the Affine set $ \left\{ x \mid A x = b \right\} $
9436
How to define an orthogonal basis in the right way?
137180
Orthonormal basis with specific norm
127882
Proofs involving orthonormal basis
81879
$Av=λv$ basis proof problems
114510
Inner Product Spaces
154724
Every vector space has a basis
723
Is there a constructive way to exhibit a basis for $\mathbb{R}^\mathbb{N}$?
86826
Almost a Vandermonde matrix
84640
Orthonormal Matrices-Intuition
112231
Showing that a one-to-one linear transformation maps a linearly independent set onto a linearly independent set
152742
Finding a basis of an infinite-dimensional vector space?
96530
Matrix representation of linear map in this basis
86246
Basis for Skew Symmetric Matrix
72077
''Linear'' transformations between vector spaces over different fields .