# What is pseudodiagonality in matrix/tensor?

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

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