I'm surprised to see that, but all subsequent authors have required it to be infinite (as a condition to distinguish it from other models of computation), and T

I'm surprised to see that, but all subsequent authors have required it to be infinite (as a condition to distinguish it from other models of computation), and Turing himself later referred to it as infinite: https://en.wikipedia.org/wiki/Turing_machine#Physical_description https://en.wikipedia.org/wiki/Turing_machine#Physical_descri...