OFEs are bicartesian closed

docs/algebra.tex

@@ -37,7 +37,8 @@ Elements that cannot be distinguished by programs within $n$ steps remain indist
   The category $\OFEs$ consists of OFEs as objects, and non-expansive functions as arrows.
 \end{defn}
 
-Note that $\OFEs$ is cartesian closed. In particular:
+Note that $\OFEs$ is bicartesian closed, \ie it has all sums, products and exponentials as well as an initial and a terminal object.
+In particular:
 \begin{defn}
   Given two OFEs $\ofe$ and $\ofeB$, the set of non-expansive functions $\set{f : \ofe \nfn \ofeB}$ is itself an OFE with
   \begin{align*}