Graphs and CCR algebras Ilijas Farah 46L0505C90simple nuclear C*-algebrasrepresentationscanonical commutation relationsgraphs I introduce yet another way to associate a $C^{*}$-algebra to a graph and construct a simple nuclear $C^{*}$-algebra that has irreducible representations both on a separable and a nonseparable Hilbert space. Indiana University Mathematics Journal 2010 text pdf 10.1512/iumj.2010.59.4144 10.1512/iumj.2010.59.4144 en Indiana Univ. Math. J. 59 (2010) 1041 - 1056 state-of-the-art mathematics http://iumj.org/access/