The proof, known to be so hard that a mathematician once offered 10 martinis to whoever could figure it out, uses number ...
Abstract: Space–time coding metasurfaces introduce a new degree of freedom (DOF) in the temporal domain, enabling advanced manipulation of electromagnetic (EM) waves, particularly in controlling waves ...
It's a well-known fact that quantum calculations are difficult, but one would think that quantum computers would facilitate the process. In most cases, this is true.