fix cross product & upd readme

2 files changed, 1 insertions, 1 deletions

diff --git a/img/output.png b/img/output.png
index 49ef003..9d1fbd8 100644
--- a/img/output.png
+++ b/img/output.png
diff --git a/src/calculus.rs b/src/calculus.rs
index 2e8a1d5..e59ae56 100644
--- a/src/calculus.rs
+++ b/src/calculus.rs
@@ -91,7 +91,7 @@ pub mod calculus {
 
         pub fn cross_prod(&self, other: &Self) -> Self {
             Self {
-                x: self.y * other.z - self.z - other.y,
+                x: self.y * other.z - self.z * other.y,
                 y: self.z * other.x - self.x * other.z,
                 z: self.x * other.y - self.y * other.x,
             }