diff --git a/实现Kyber所需的多项式和线性代数知识.md b/实现Kyber所需的多项式和线性代数知识.md
index c179214..41b51b9 100644
--- a/实现Kyber所需的多项式和线性代数知识.md
+++ b/实现Kyber所需的多项式和线性代数知识.md
@@ -99,6 +99,7 @@ $$\bf{A}=\begin{bmatrix}
     \hat{a}_{1,0} & \hat{a}_{1,1} & \hat{a}_{1,2} \\
     \hat{a}_{2,0} & \hat{a}_{2,1} & \hat{a}_{2,2} \\
 \end{bmatrix}
+\circ
 \begin{bmatrix}
     \hat{v}_{0} \\
     \hat{v}_{1} \\
@@ -121,6 +122,7 @@ $$\bf{A}=\begin{bmatrix}
 \begin{bmatrix}
     \hat{u}_0 & \hat{u}_1 & \hat{u}_2 \\
 \end{bmatrix}
+\circ
 \begin{bmatrix}
     \hat{v}_{0} \\
     \hat{v}_{1} \\