On a formula of Thompson and McEnteggert for the adjugate matrix

Kenier Castillo, Ion Zaballa

For an eigenvalue ${\lambda }_0$ of a Hermitian matrix $A$, the formula of Thompson and McEnteggert gives an explicit expression of the adjoint of ${\lambda }_{0}I-A$, $\mathrm{adj}({\lambda }_{0}I-A)$, in ter…