# The eigenvalues of a triangular matrix are the entries on the main diagonal.

math.la.t.mat.eig.triangular

# Characteristic equation of a matrix

Theorem: \lambda is an eigenvalue of a matrix A if and only if \lambda satisfies the characteristic equation det(A-\lambda I) = 0; examples; eigenvalues of triangular matrices are the diagonal entries.

##### math.la.t.mat.eig.triangular
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