I would like to know what is a idempotent matrix? Also, which invertible matrices are also idempotent and can a matrix be nilpotent and idempotent at the same time?
In algebra, an idempotent matrix is a matrix which, when multiplied by itself, yields itself. (guess where this is from...)
With the exception of the identity matrix, an idempotent matrix is singular...
Does the zero matrix count?
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2 years ago