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Linear Algebra Theorems & Definitions

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Course Notes
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Sub-category
Linear Algebra
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MATH 235

Abstract Vector Spaces

The Definition of a Vector Space

Subspaces

Bases and Dimension

Linear Independence, Spanning Sets, and Bases

Dimension

Obtaining Bases

Linear Transformations

Linear Transformations Between Abstract Vectors

Rank and Nullity

Linear Maps as Matrices

Column space / Nullspace
If yCol(A)y \in Col(A), y=Axy = Ax for some xFnx \in F^n

Change of Coordinates

Isomorphisms of Vector Spaces

Diagonalizability

Eigenvectors and Diagonalization

Diagonalization

Applications of Diagonalization (Not in Final)

Inner Product Spaces

Inner Products

Orthogonality

Orthonormal Bases

Projections

The Gram-Schmidt Orthogonalization Procedure

Orthogonal Complements

Projection onto a Subspace

Application: Method of Least Squares (Not in Final)

Least Squares Curve Fitting

Orthogonal Diagonalization

Orthogonal and Unitary Matrices

Matrix is orthogonal if its columns are orthonormal
Or Matrix is orothogonal if QQ^T=I
Properties of the Adjoint

Schur’s Triangularization Theorem

Orthogonal and Unitary Diagonalization of Matrices

Orthogonal and Unitary are the same, but R for orthogonal and C for unitary
Similarly, Symmetric and Hermitian

Inner Products and Hermitian Matrices

The Matrix of an Inner Product

Unitary Diagonalization of Operators

Application: Classifying Quadratic Forms (Not in Final)

The Singular Value Decomposition

Singular Values and Singular Vectors

Singular Value Decomposition of Matrices

The Geometry of the Singular Value Decomposition

Singular Value Decomposition of Linear Maps (Not in Final)

Applications of the Singular Value Decomposition (Not in Final)

Low-rank Approximations

The Pseudoinverse and Least Squares Revisited

Others