Question: the minimization problem is min_{Lambda, F_t} frac{1}{NT} sum_{t=1}^T (X_t - Lambda F_t)' Sigma_{ee}^{-1} (X_t - Lambda F_t) s.t. Lambda Lambda' = I by replacing F_t

the minimization problem is \min_{\Lambda, F_t} \frac{1}{NT} \sum_{t=1}^T (X_t - \Lambda F_t)' \Sigma_{ee}^{-1} (X_t - \Lambda F_t) s.t. \Lambda \Lambda' = I by replacing F_t = (\Lambda' \Sigma_{ee}^{-1} \Lambda)^{-1} \Lambda' \Sigma_{ee}^{-1} X_t

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