From Guy Cox, Sydney, Australia
Your article on infinity deals with very large and very abstruse concepts of it. But what about smaller, everyday infinities?
The number pi is something we use often enough, but it can only be expressed accurately with an infinite series of digits. This doesn’t make it large – we all know that 4 is a larger number(9 August, p 28). What are the ultrafinitists going to do about this? Are they going to redefine pi with a fixed number of decimal places?
