Barcelona are through to the Champions League semi-finals with a 5-3 aggregate win, despite losing 3-1 at Borussia Dortmund on Tuesday with Serhou Guirassy hitting a hat-trick. Holding a 4-0 lead ...

WILL one of your mathematical readers kindly state whether the following empirical formula gives a nearer approximation to the perimeter of an ellipse than that usually given in pocket-books of ...

She is looking to win a record-equalling 24th Grand Slam title Serena Williams came from a set down to beat fellow mother Tsvetana Pironkova and reach the semi-finals of the US Open on Wednesday ...