[GAP Forum] Strange behaviour with Union - possible bug?

[Matt Fayers]

Dear GAP forum,

I am experiencing some strange behaviour with GAP's Union function: the 
command

Union([2],[3],[5,1..1]);

returns

[2,3]

rather than the expected [1,2,3,5].  (If I do

Union([2],[3],[5,1])

or

Union([2],[5,1..1])

the behaviour is as expected.)

Any ideas?  I'm running GAP 4.7.5 on Linux (because that's the version 
that comes with my Linux distribution); I apologise if this has already 
been resolved in a more recent version.

Best wishes,
Matt Fayers.
____________________________________________________________________

Matthew Fayers
School of Mathematical Sciences
Queen Mary University of London
Mile End Road
London
E1 4NS
020 7882 5479
www.maths.qmul.ac.uk.~mf/
____________________________________________________________________