\magnification=1200 \hsize=4in \overfullrule=0pt \input amssym %\def\frac#1 #2 {{#1\over #2}} \def\emph#1{{\it #1}} \def\em{\it} \nopagenumbers \noindent % % {\bf Stephen Howe} % % \medskip \noindent % % {\bf Dominating Sets of Random 2-in 2-out Directed Graphs} % % \vskip 5mm \noindent % % % % We analyse an algorithm for finding small dominating sets of $2$-in $2$-out directed graphs using a deprioritised algorithm and differential equations. This deprioritised approach determines an a.a.s.\ upper bound of $0.39856n$ on the size of the smallest dominating set of a random $2$-in $2$-out digraph on $n$ vertices. Direct expectation arguments determine a corresponding lower bound of $0.3495n$. \bye .