From ee3d630deaa0338b54fa569aae0783fb581dff52 Mon Sep 17 00:00:00 2001 From: bnewbold Date: Wed, 30 Jun 2010 06:34:12 +0000 Subject: yet more tex --- ClassJune26.page | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'ClassJune26.page') diff --git a/ClassJune26.page b/ClassJune26.page index 0d8d588..b5454a4 100644 --- a/ClassJune26.page +++ b/ClassJune26.page @@ -162,8 +162,8 @@ 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 -$$\begin{array}{ccc} -ee^{iy} & = & 1+iy+\frac{(iy)^{2}}{2!}+\frac{(iy)^{3}}{3!}+\frac{(iy)^{4}}{4!}+\frac{(iy)^{5}}{5!}+\cdots\\ +$$\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)\\ & = & \cos y+i\sin y\end{array}$$ @@ -219,7 +219,7 @@ means that $\left(\begin{array}{c} \frac{\partial u}{\partial y}\end{array}\right)$ is $\left(\begin{array}{c} \frac{\partial u}{\partial x}\\ \frac{\partial v}{\partial x}\end{array}\right)$ rotated by $\pi/2$. If we write -$\[\left(\begin{array}{c} +$\left(\begin{array}{c} a\\ b\end{array}\right)=\left(\begin{array}{c} \frac{\partial u}{\partial x}\\ -- cgit v1.2.3