Proof, Menier Chocolate Factory, London
Proof tells the story of Robert (Matthew Marsh), a one-time maths genius who, now middle-aged, suffers from an unspecified, sporadic madness and general mental decline, after his skills peaked at the age of 25. It focuses on his daughter, Catherine, played by Mariah Gale, who is also very gifted at maths, but gave up a place at college to care for him full-time. The set is the back garden of their dilapidated home in…