Graph theory has a lot to say about how phenomena can grow, such as the spread of infectious diseases. There are different graphs, or networks, of relations, and they can affect things such as the ...

A graph in this case is any number of points, called nodes, connected by pairwise relations, called edges. In other words, an edge is a curve that connects two nodes.

New research shows that metasurfaces could be used as strong linear quantum optical networks. The approach could eliminate ...

While the theory of linear waves is fairly established, nonlinear wave motion remains a complex, often mysterious, object—particularly when the nonlinearity is strong. For example, an unbalanced ...

Refining with colors. Mathematicians have developed various strategies to compare graphs. Since the 1970s, algorithms have been able to test graph isomorphism, but in exponential time.