Adjuntu

Aljebra linealean, matrize karratu bateko ${\displaystyle a_{i,j}\,\!}$ elementu bati dagokion adjuntua ${\displaystyle A_{i,j}\,\!}$ zenbaki bat da, non ${\displaystyle A_{i,j}=(-1)^{i+j}\cdot \ M_{i,j}\,\!}$ den, ${\displaystyle M_{i,j}\,\!}$ ${\displaystyle a_{i,j}\,\!}$ elementuari dagokion minorra izanik.

${\displaystyle A={\begin{pmatrix}1&2&3\\4&5&6\\7&8&9\end{pmatrix}}}$

${\displaystyle A_{2,2}=(-1)^{2+2}\cdot \ {\begin{vmatrix}1&3\\7&9\end{vmatrix}}=1\cdot \ (1\cdot \ 9-3\cdot \ 7)=-12}$

Adibide horretan aukeratutako elementua ${\displaystyle a_{2,2}\,\!}$ da, hots, ${\displaystyle 5\,\!}$ zenbakia.

• Datuak: Q680796