diff --git a/src/algebra/binary-exp.md b/src/algebra/binary-exp.md
index 52dfd27a5..99c12a30a 100644
--- a/src/algebra/binary-exp.md
+++ b/src/algebra/binary-exp.md
@@ -177,7 +177,7 @@ a_{31} & a_ {32} & a_ {33} & a_ {34} \\
a_{41} & a_ {42} & a_ {43} & a_ {44}
\end{pmatrix}$$
-that, when multiplied by a vector with the old coordinates and an unit gives a new vector with the new coordinates and an unit:
+that, when multiplied by a vector with the old coordinates and a unit gives a new vector with the new coordinates and a unit:
$$\begin{pmatrix} x & y & z & 1 \end{pmatrix} \cdot
\begin{pmatrix}
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