Continuous and discrete basis of Hilbert Space
14166
Hilbert space of harmonic oscillator: Countable vs uncountable?
61484
Continuously invertible operators
86246
Basis for Skew Symmetric Matrix
98535
Are eigenstates of the position operator continuous?
40941
Applications of Gröbner bases
61539
proof for a basis in $L^2$
140379
Cauchy sequence in a discrete space
137890
Diagonalizable Operators and characteristic polynomials
87692
Basis and dimension of vector space
78648
Find an orthonormal basis for the subspace of $\mathbb R^4$
14550
Every Hilbert space has an orthonomal basis - using Zorn's Lemma
40305
Hilbert space of a free particle: Countable or Uncountable?
128835
Compactness of the set of $n \times n$ orthogonal matrices
138720
Minimum principle in Hilbert space
55691
Are states of a quantum system represented by vectors in a Hilbert space?
57609
Hahn-Banach proof by extension of basis
145885
Linear transformation preserving orthogonality