Infinitesimals in the old sense are no longer with us. For a century and a half.
But they can be redefined as the hyperreal numbers
Or the surreal numbers, or the dual numbers, or about a billion other systems of infinitesimals that mathematicians use.
Infinitesimals in the old sense are no longer with us. For a century and a half.
But they can be redefined as the hyperreal numbers
Or the surreal numbers, or the dual numbers, or about a billion other systems of infinitesimals that mathematicians use.