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Saddle Point
real eigenvalues of opposite sign

Center
Purely imaginary eigenvalues

Spiral Source
complex eigenvalues with positive real part

Spiral Sink
complex eigenvalues with negative real part

Parallel Lines
One eigen value equals 0 while the other is any real number
Proper Nodal Source
A repeated positive real eigenvalue with two linearly independent eigenvectors

Proper Nodal Sink
A repeated negative real eigenvalue with two linearly independent eigenvectors

Improper Nodal Source (Distinct)
Distinct positive real eigenvalue without two linearly independent eigenvectors

Improper Nodal Source (Repeated)
Repeated positive real eigenvalue without two linearly independent eigenvectors

Improper Nodal Sink (Distinct)
Distinct negative real eigenvalue without two linearly independent eigenvectors

Improper Nodal Sink (Repeated)
Repeated negative real eigenvalue without two linearly independent eigenvectors
