a is the Gödel number of a sentence iff a is the Gödel number of a formula and for any b < a, if b is the Gödel number of a variable then 〈a, b〉 ∉ Fr. 9. There is a representable relation Sbl such that for a formula α, variable x, and term t,〈#a, #x, ...
While all mathematicians accept 0 as a number, some non-mathematicians would say that zero is not a number, arguing one cannot have 0 of something. Others hold that if suppose you have a bank balance of zero rupees, you have a specific quantity of money in your account, that is namely ...