And that of which no part is wanting, would be a whole?

Certainly.

Then, in either case, one would be made up of parts; both as being a whole, and also as having parts?

Certainly.

And in either case, the one would be many, and not one?

True.

But, surely, one ought to be not many, but one?

Surely.

Then, if one is to remain one, it will not be a whole, and will not have parts?

No.