MPEJ Volume 10, No. 6, 7 pp. Received: Mar 10, 2004. Accepted: Apr 18, 2004. Charles Radin Existence of Ground State Configurations ABSTRACT: We prove the existence of ground state configurations for systems of infinitely many particles interacting, in $d$-dimensional Euclidean space, through many-body potentials with hard core. http://www.maia.ub.es/mpej/Vol/10/6.ps http://www.maia.ub.es/mpej/Vol/10/6.pdf http://www.ma.utexas.edu/mpej/Vol/10/6.ps http://www.ma.utexas.edu/mpej/Vol/10/6.pdf http://mpej.unige.ch/mpej/Vol/10/6.ps http://mpej.unige.ch/mpej/Vol/10/6.pdf