+ def minimal_polynomial(self):
+ """
+ Return the minimal polynomial of this linear operator,
+ in the variable ``t``.
+
+ EXAMPLES::
+
+ sage: J = RealSymmetricEJA(3)
+ sage: J.one().operator().minimal_polynomial()
+ t - 1
+
+ """
+ # The matrix method returns a polynomial in 'x' but want one in 't'.
+ return self.matrix().minimal_polynomial().change_variable_name('t')
+
+