The superdiagonal of a square matrix is the set of elements directly above the elements comprising the diagonal.
For example, in the following matrix, the diagonal elements are denoted 
and the superdiagonal elements are denoted 
,
![[d_1 s_1 a_(13) ... a_(1n); a_(21) d_2 s_2 ... a_(2n); a_(31) a_(32) d_3 ... a_(3n); | ... ... ... ...; a_(n1) a_(n2) a_(n3) ... d_n].](/images/equations/Superdiagonal/NumberedEquation1.svg) |
Superdiagonal
See also
Diagonal, Subdiagonal, Tridiagonal MatrixExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Superdiagonal." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Superdiagonal.html