From Zhou Fang
John Feather argues that Sudoku is a matter of logic, not maths, because the numbers used are merely representative symbols (5 November, p 21). However, much of modern mathematics does not deal with numbers at all, but with abstract objects for which numbers may be used as convenient symbols. Logical games are mathematical games, because maths is just formalised logic.
Coventry, Warwickshire, UK
