diff --git a/maths/assignment-matrices/assign4.tex b/maths/assignment-matrices/assign4.tex
index fc554df..80e74ef 100644
--- a/maths/assignment-matrices/assign4.tex
+++ b/maths/assignment-matrices/assign4.tex
@@ -595,7 +595,7 @@ Doing transformations to form row echelon form, we get
 
 \section*{Question 15}
 \subsection*{Part i}
-Since $A + A^{-1} = 0$, $A$ must either be skew symmetric. If A is skew symmetric, we know that the rank of an odd order skew symmetric matrix must be even. $\therefore Rank \leq 2020$
+Since $A + A^T = 0$, $A$ must either be skew symmetric. If A is skew symmetric, we know that the rank of an odd order skew symmetric matrix must be even. $\therefore Rank \leq 2020$
 \subsection*{Part ii}
 Inverse does not exist as $A$ is singular matrix.
 \end{document}