HP 49g+ - Manual (Page 108)

Page 7-5
With system flag 117 set to SOFT menus, the MTH/LIST menu shows the
following functions:
The operation of the MTH/LIST menu is as follows:
∆ LIST : Calculate increment among consecutive elements in list
Σ LIST : Calculate summation of elements in the list
Π LIST : Calculate product of elements in the list
SORT : Sorts elements in increasing order
REVLIST : Reverses order of list
ADD
: Operator for term-by-term addition of two lists of the same length
(examples of this operator were shown above)
Examples of application of these functions in ALG mode are shown next:
SORT and REVLIST can be combined to sort a list in decreasing order: