Graph colouring, the assignment of colours to the vertices of a graph so that no two adjacent vertices share the same colour, represents a canonical NP-hard combinatorial optimisation problem with ...

Indonesia's finance minister has suggested tolls could be levied on ships using the Strait of Malacca, in a similar move to Iran in the Strait of Hormuz, before walking back the idea. Australia has ...

Australia has stressed the importance of freedom of navigation after a powerful Indonesian minister suggested three South-East Asian nations could follow Iran's lead and put a toll on ships passing ...

Discover the history and significance of greenbacks, the U.S. paper dollars printed during the Civil War, known for their ...