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- 11$I_m - AB$ is invertible if and only if $I_n - BA$ is invertible.
- 7What is degree of freedom in statistics?
- 7Prove convergence of the sequence $(z_1+z_2+\cdots + z_n)/n$ of Cesaro means
- 6Can we characterize the Möbius transformations that maps the unit circle into itself?
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