主しゅ対たい角かく線せん

noun

principal diagonal; main diagonal

In linear algebra, the diagonal of a square matrix that runs from the top-left to the bottom-right.

• 正せい方ほう行ぎょう列れつの主しゅ対たい角かく線せん上じょうの要よう素その和わをトレースという。

  The sum of the elements on the principal diagonal of a square matrix is called the trace.