1926- approximationmethods brown celestialmechanics chaoticbehaviorinsystems condensedmatter condensedmatterphysics congresses degreeoffreedom energy-bandtheoryofsolids etc exercises exploration fermiliquidtheory fermisurfaces feynmandiagrams fluctuations(physics) gravityassist(astrodynamics) green'sfunctions hadrons hartree-fockapproximation heavyions highperformancecomputing hubbardmodel hydrodynamics irreversibleprocesses isingmodel kwantummechanica kwantumveldentheorie lowtemperatures mathematicalandcomputationalphysics mathematicalphysics metalcrystals montecarlomethod nuclearphysics numericalsolutions opensystems(physics) opticallattices opticalproperties particles(nuclearphysics) physics popularworks problems quantumcomputers quantumfieldtheory quantumoptics quantumstatistics quantumtheory schrödingeroperator science solids solidstatephysics spacesofconstantcurvature statisticalmechanics textbooks theoretical thermodynamics two-bodyproblem unifiedfieldtheories veel-deeltjes-systemen