I just tried a different variant:
SCartesian(n) : Exports == Implementation where
....
Exports ==> SPointCategory()
Implementation ==> add
and I am getting yet another error message:
(4) -> PT ==> SCartesian(2)
Type: Void
(5) -> sipnt(-1,-1)$PT
Internal Error
The function sipnt with signature hashcode is missing from domain
SCartesian2
(5) -> a:=spnt(1.0,2.0)$PT
(5) ("p",1.0,2.0,1.0)
Type: SCartesian(2)
(6) -> b:=spnt(3.0,4.0)$PT
(6) ("p",3.0,4.0,1.0)
Type:
SCartesian(2)
(7) -> colinearity(a,b)$PT
Internal Error
The function colinearity with signature hashcode is missing from
domain SCartesian2
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