deletions | additions       diff --git a/section_Another_Form_begin_equation__.tex b/section_Another_Form_begin_equation__.tex  index 735ae97..83773ec 100644  --- a/section_Another_Form_begin_equation__.tex  +++ b/section_Another_Form_begin_equation__.tex 
...
We can express a general form. Define $A$ to be a token \begin{equation}  A=\begin{bmatrix}0& 1\\0 &0 \end{bmatrix}  \end{equation}  such that $A^k=\emptyset$, for $k>1$. Then \begin{equation}  \log(\prod_{k=2}^\infty Ax^k+f(k)) = A\sum_{k=1}^\infty \frac{x^k}{f(k)}   \end{equation}