> A number called "door" is conceivable (like superman) but it is not a possible under the rules of maths (or physics in superman's case) because "door" is not in that set of symbols.
Certainly you are able to represent "door" in a base-64 numbering system? (or base-36, or even base-28)
Ah, but "a base-64 numbering system" is a different set of rules ;)
And it's rules in which "door" is a "numbery name". And "Достоевский" is not.
You could still ask "If there are infinite base-64 numbers, and all base-64 numbers have a name, then must there exist a number called "Достоевский" ?" and the same argument against would apply.
Certainly you are able to represent "door" in a base-64 numbering system? (or base-36, or even base-28)