Analysis of information sources in references of the Wikipedia article "List of unsolved problems in physics" in English language version.
Yet despite major efforts by many groups, the theoretical description of granular systems remains largely a plethora of different, often contradictory concepts and approaches.
Yet despite major efforts by many groups, the theoretical description of granular systems remains largely a plethora of different, often contradictory concepts and approaches.
Yet despite major efforts by many groups, the theoretical description of granular systems remains largely a plethora of different, often contradictory concepts and approaches.
The deepest and most interesting unsolved problem in solid state theory is probably the theory of the nature of glass and the glass transition.
The deepest and most interesting unsolved problem in solid state theory is probably the theory of the nature of glass and the glass transition.
The deepest and most interesting unsolved problem in solid state theory is probably the theory of the nature of glass and the glass transition.