Texas Instruments TI-83 PLUS - Manual (Page 306)

TI-83 Plus Lists 303
seq( expression , variable , begin , end [ , increment ] )
cumSum(
cumSum( (cumulative sum) returns the cumulative sums of the elements
in list , starting with the first element. list elements can be real or complex
numbers.
cumSum( list )
@ List(
@ List( returns a list containing the differences between consecutive
elements in list . @ List subtracts the first element in list from the second
element, subtracts the second element from the third, and so on. The list
of differences is always one element shorter than the original
list . list
elements can be a real or complex numbers.
@ List( list )