A note on the equality of rank and trace for an idempotent matrix

作者：Wright S E^*

来源：Applied Mathematics and Computation, 2011, 217(16): 7048-7049.

DOI：10.1016/j.amc.2011.02.001

• Oblique projector
• Matrix factorization

The equality of rank and trace for an idempotent matrix is established by means of elementary matrix factorizations. The proof is substantially simpler than most found in the literature.

• 出版日期2011-4-15