From Fred Grisley
At the beginning of your feature on the role of nothing in mathematics
(“Zero, zilch and zip”, 25 April, p 40)
appears “the `proof’ that 1 = 2 because both equal 0 when they are divided by 0”.
Not so. They would both equal infinity. The “proof” actually depends on 1 × 0
= 2 × 0.
Barry, Glamorgan
