J has complex numbers, including imaginary numbers, actually. Thanks,
-- Raul On Thu, May 31, 2018 at 1:42 PM, Donna Y <[email protected]> wrote: > There are Natural numbers that can be used for counting (Cardinal) and > ordering (Ordinal). > > Indexing arrays is an instance of Ordinals. > > Counting elements in arrays is an instance of Cardinal. > > J might not have Irrational or Imaginary or Complex numbers but it does have > Natural numbers which can be used as Ordinal or Cardinal even if J does not > declare that type. There might be Real or Integer or Rational numbers. The > natural numbers with 0, correspond to the non-negative integers > > > Donna Y > [email protected] > > >> On May 31, 2018, at 1:22 PM, Raul Miller <[email protected]> wrote: >> >> On Thu, May 31, 2018 at 11:48 AM, Jose Mario Quintana >> <[email protected]> wrote: >>>> Are you referring to the notation you invented, here? >>> >>> The notation I invented? >> >> Oops, I thought you were Bo, for some reason. I don't remember all the >> details of the notations he has proposed. But that's my mistake and >> not a relevant tangent in this thread, for now at least. >> >>>> When I try to look up "finite mathematical ordinals" I don't see >>>> anything significant with that label. And when I try to parse that >>> >>> In general, mathematical ordinals and mathematical cardinals are not the >>> same. >> >> They are indeed different abstractions. Howeve, that does not mean >> that there's no equivalences between them. >> >>>> phrase as individual words, I see no contradiction with what I had >>>> said. >>> >>> I do not see one either (often I respond to posts in sequence without >>> necessarily having read all the subsequent posts). >> >> Fair enough. >> >> Thanks, >> >> -- >> Raul >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
