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Extract a sub-list

If l is a list of size s, l[n1..n2] returns the list extracted from l containing the elements of indices n1 to n2 where 0 $ \leq$ n1 $ \leq$ n2 < s (in Xcas syntax mode) or 0 < n1 $ \leq$ n2 $ \leq$ s in other syntax modes. The equivalent prefixed function is at with a list and an interval of integers (n1..n2) as arguments.
See also : mid, section 1.37.3.
Input :
Output :
at can not be used for sequences, index notation must be used, like in (0,1,2,3,4,5)[2..3].

giac documentation written by Renée De Graeve and Bernard Parisse