>> https://github.com/fricas/fricas/blob/master/src/algebra//sups.spad#L284
>>
>> Shouldn't it rather be something like this?
>>
>>     iOrder(st, n, refer) ==
>>       explicitlyEmpty? st => n
>>       ...
> 
> Yes, this is place to change, but the fix I commited needs
> a second line.

Oh, you are right. But that again is an example where I would have preferred

  iOrder(st: ST, n: COM, refer: REF): I == ...

that would have given me a quicker hint of the fact that n could be
plusInfinity() or minusInfinity().

Ralf

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