As I understand it, the star notation is the standard way of denoting the 
injection of an entity from, say, the standard reals to the non-standard reals. 
It is normally written as a prefix operator. Maybe we could do something using 
our  ⋆ character. But we have two other naming conventions in NSA: the prefixes 
hr and NS. 

A lot of work needs to be done in order to bring this development up-to-date. 
I’m glad to see that the star operator is now fully integrated into the 
axiomatic type class system, but quite a lot of material made redundant by that 
step is still present.


> On 3 Mar 2017, at 09:28, Makarius <> wrote:
> On 27/02/17 18:22, Lawrence Paulson wrote:
>> Note: I have no suggestions for improving the star notation of
>> non-standard analysis, mentioned in the last paragraph.
> Can you point to some literature or papers that use the notation in a
> canonical form?
>       Makarius

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