4 ms·

But don't these models all have a true zero, distinct from the infinitesimals, which is its own negative?

• cperciva 9y ago
  Usually, yes. But sometimes it's written as 0^\infty.
  • tprice7 9y ago
    "Usually" So there is an instance where this isn't the case?
    • cperciva 9y ago
      Well... notation. People come up with all sorts of ways of writing things and all sorts of weird models.