What is the difference between diagonality and pseudodiagonality? Does this apply to tensor too?

https://www.math.uzh.ch/fileadmin/math/preprints/06_11.pdf https://www.math.uzh.ch/fileadmin/math/preprints/06_11.pdf

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    $\begingroup$ I assume it's that "diagonal" usually only applies to square matrices. $\endgroup$ – Qiaochu Yuan Aug 28 '14 at 7:30
  • $\begingroup$ That sounds reasonable $\endgroup$ – Tyler 十三将士归玉门 Jan 28 '15 at 14:01

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