Infinity is not a number, plain and simple

Well, some of them are.

That's countable infinity, cardinal. I suspect he meant the first ordinal infinity by "infinity". That is, omega, which is one less than omega plus one. And very countable. He meant the limit of all finite integer speeds, which is definitely the ordinal omega.

Or maybe he meant an upper limit for all real numbers. I think that would be omega too, but we'd have to move into the surreal domain from the ordinal domain to compute it ... yes it is.

Or maybe he meant some nonstandard model of the peano axiom system? There are plenty of those, with numbers greater than any finite number. But the trouble is that anything that you say about all large finite numbers is automatically true of the extra numbers too, in such systems, so they're a bit strange. A fraction that tends to one of all of them tend to have nontrivial factors. Unforunately, nobody is going to see them all, in any case! Oh, and half of them are divisible by two.

Was. And an 80 year old genius at that.

Grumph. Well, we know what he means. Any measurement of a real quanbreasty is an approximation to the truth, "zero" included.

He is on mushrooms.

Peter