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Home > Characteristic equation


In linear algebra, the characteristic equation of a square matrix A is the equation in one variable λ

where I is the identity matrix. The solutions of the characteristic equation are precisely the eigenvalues of the matrix A. The polynomial to the left of "=" is the characteristic polynomial of the matrix.

For example, for the matrix

the characteristic equation is

The eigenvalues of this matrix are therefore 20 and 25.

Linear algebra Equations

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