Can anyone explain why GAP behaves as follows?

gap> Intersection([1..3],[1..3]);
[ 1 .. 3 ]
gap> Intersection([-3..-1],[-3..-1]);
[ -3 .. -1 ]
gap> Intersection([-1..1],[-1..1]);
[  ]


____________________________________________________
Matthew Fayers

Queen Mary, University of London
Mile End Road
London E1 4NS
U.K.

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