Operators and Matrices · Volume 5, Issue 4 Dirichlet forms for singular diffusion on graphs 05-51 Pages 723-734 DOI 10.7153/oam-05-51 Downloads Short PDF Full PDF PNG Authors Christian Seifert Jürgen Voigt Keywords gap diffusion quantum graph Dirichlet form C0-semigroup positive submarkovian Subject classes 47D06 60J60 47E05 35Q99 05C99