Solution 2: Infinite lattice summation Infinite lattice summation don't cut-off force use an infinite number of mirror cells Formulae available for log-interaction Gronbech-Jensen, Intern. J. Mod. Phys. C, 7, 873-881 (1996) K0-interaction Fangohr et.al., J. Comp. Phys., 162, 372-384 (2000)