1. In q1, should we assume that $X\Sigma^{-1}X^t$ is invertible? where X is the data matrix.

2. In q2, how do you define a variance of matrix where you don't assume what we assumed in class that $\sum_{i=1} ^{n} x_i =0$ ?

- Instructors
- Prof. Lior Wolf

Prof. Eran Halperin - Teaching Assistant
- Regev Schweiger

- Exam: Feb. 3
^{rd}, 2015 - Moed B: Sept. 4
^{th}, 2015

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