Update Gram matrix parameterization

Gram-matrix-parameterization.md

@@ -39,12 +39,7 @@ on $\operatorname{Hom}(\mathbb{R}^n, V)$. Finding a global minimum of the *loss
 #### The first derivative of the loss function
 
 Write the loss function as
-\[
+\[ \begin{align*} f & = \|\Delta\|^2 \\ & = \operatorname{tr}(\Delta^\top \Delta), \end{align*} \]
-\begin{align*}
-f & = \|\Delta\|^2 \\
-& = \operatorname{tr}(\Delta^\top \Delta),
-\end{align*}
-\]
 where $\Delta = G - \mathcal{P}(A^\top Q A)$. Differentiate both sides and simplify the result using the transpose-invariance of the trace:
 \[
 \begin{align*}