\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 Iwao SATO }
%
%
\medskip
\noindent
%
%
{\bf Bartholdi Zeta Functions for Hypergraphs}
%
%
\vskip 5mm
\noindent
%
%
%
%
Recently, Storm defined the Ihara-Selberg zeta function of a
hypergraph, and gave two determinant expressions of it. We define the
Bartholdi zeta function of a hypergraph, and present a determinant
expression of it. Furthermore, we give a determinant expression for
the Bartholdi zeta function of semiregular bipartite graph. As a
corollary, we obtain a decomposition formula for the Bartholdi zeta
function of some regular hypergraph.
\bye