Hello,
in the following code I would like to replace x with T in Delta_X so as to
illustrate
the Cayley Hamilton theorem by doing everything by hands.

Is it possible ?

Best regards.
Christophe BAL

=========================
var('a b c d e f')

T = matrix([
    [a, b, c],
    [0, d, e],
    [0, 0, f]
])

T_X = T - x*identity_matrix(3)

Delta_X = det(T_X)

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