Sudoku and Graph Theory. Mathematicians find new clues to the popular puzzle. By Julie Rehmeyer. July 3, 2007 at 4:39 pm. ... the smallest number known to be possible on a 9-by-9 grid.

Traditionally, power grids are unidirectional, supply from stations to homes. Wind energy, however, can be produced locally too and thus we need bidirectional lines in the grid so that excess energy ...

Graph theory is the study of networks and connections between variables. In the real world it has uses from powering search engine algorithms to fixing airline scheduling. Now, scientists are ...

With the emergence of smart grids as the primary means of distribution across wide areas, the importance of improving its resilience to faults and mishaps is increasing. The reliability of a ...