I am trying to draw a very simple network diagram. My code:
\begin{tikzpicture}
\node[draw, shape=circle] (v0) at (0,0) {$v_0$};
\node[draw, shape=circle] (v1) at (1,0) {$v_1$};
\node[rectangle,minimum width=6em,draw] (v3) at (0.5,-1) {$v_3$};
\draw [thick] (v0) -- (v1)
(v0) -- (v3)
(v1) -- (v3);
\end{tikzpicture}
This produces the following figure:
I want the lines from the upper two nodes to go straight down towards the edge of the rectangle. Is there a simple way to do this?