An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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trace of a matrix
  مله‌ی ِ ماتریس  
male-ye mâtris
Fr.: trace de matrice  

Of a → square matrix, the → sum of the entries in the → main diagonal, i.e.: tr(A) = a11 + a22 + … + ann = Σ aii (i = 1 to n).

See also: → trace; → matrix.