Complexity: are easily-checked problems also easily solved?
That’s Maths: Many problems are hard to solve but easy to verify, such as Sudoku puzzles
That’s Maths: Many problems are hard to solve but easy to verify, such as Sudoku puzzles
Tourists face uphill task to retrieve third test in Port Elizabeth
England still in with a slim chance after rain-interrupted third day of Fourth Test
Tourists miss chances to finish South Africa off at Centurion as Proteas post big score
Stephen Cook scores debut on his debut at Centurion
Crosswords & puzzles to keep you challenged and entertained
Full general election coverage including analysis and results for all 43 constituencies
How does a post-Brexit world shape the identity and relationship of these islands
Weddings, Births, Deaths and other family notices