update notations

content/CSE559A/CSE559A_L21.md

@@ -64,7 +64,7 @@ $d = \begin{bmatrix}
 u \\ v
 \end{bmatrix}$
 
-The solution is $d=(A^T A)^{-1} A^T b$
+The solution is $d=(A^\top A)^{-1} A^\top b$
 
 Lucas-Kanade flow: 
 
@@ -170,7 +170,7 @@ E = \sum_{i=1}^n (a(x_i-\bar{x})+b(y_i-\bar{y}))^2 = \left\|\begin{bmatrix}x_1-\
 $$
 
 We want to find $N$ that minimizes $\|UN\|^2$ subject to $\|N\|^2= 1$
-Solution is given by the eigenvector of $U^T U$ associated with the smallest eigenvalue
+Solution is given by the eigenvector of $U^\top U$ associated with the smallest eigenvalue
 
 Drawbacks: