correcting a mistake

1 files changed, 1 insertions, 1 deletions

diff --git a/ClassJune26.page b/ClassJune26.page
index 4a23318..b5454a4 100644
--- a/ClassJune26.page
+++ b/ClassJune26.page
@@ -162,7 +162,7 @@ and add them up just fine, so we can exponentiate complex values of
 $z$. We know what happens to real values, what happens to pure imaginary
 ones? Let $y\in\mathbb{R}$. Then  
 
-$$\begin{array}
+$$\begin{array}{ccl} 
 e^{iy} & = & 1+iy+\frac{(iy)^{2}}{2!}+\frac{(iy)^{3}}{3!}+\frac{(iy)^{4}}{4!}+\frac{(iy)^{5}}{5!}+\cdots\\
  & = & 1+iy-\frac{y^{2}}{2!}-i\frac{y^{3}}{3!}+\frac{y^{4}}{4!}+i\frac{y^{5}}{5!}+\cdots\\
  & = & (1-\frac{y^{2}}{2!}+\frac{y^{4}}{4!}+\cdots)+i(y-\frac{y^{3}}{3!}+\frac{y^{5}}{5!}-\cdots)\\