Is there a name for a symmetric matrix where all off-diagonal elements are the same positive constant? The diagonal elements may differ. I am interested in the properties of its Eigenvalues (and vectors) and would like to find it in the literature.

  • $\begingroup$ You can find such matrices here at this site, see this duplicate, for equal diagonal elements. There are several such posts here, have a look (e.g. this post etc.) $\endgroup$ – Dietrich Burde Jun 13 at 15:01

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