fixing matrix multiplication error

1 files changed, 1 insertions, 1 deletions

diff --git a/notes/extensions.tex b/notes/extensions.tex
index 0b48f83..ef73bf4 100644
--- a/notes/extensions.tex
+++ b/notes/extensions.tex
@@ -27,6 +27,6 @@ the model runs indefinitely until time $T$, a hyperparameter of the model.
 Therefore, $\mathbb{E}[X_{n+1} | X_n] = A^T X_n$ and $\mathcal{G} = \sum_i A^i
 \mathbb{E}[X_0 X_0^T] (A^T)^i$.  In the case of the single-source model,
 $\mathbb{E}[X_0X_0^T] = \frac{1}{m} I_m$ and it follows that $$\mathcal{G} =
-\frac{1}{m} \sum_{i=1}^T (A A^T)^i$$
+\frac{1}{m} \sum_{i=1}^T A^i (A^T)^i$$
 
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