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In OCaml, a list can be divided using the List.split function. This function takes a list as input and returns two lists, with the first list containing the first n elements of the input list and the second list containing the remaining elements.
The List.split function has the following signature:
List.split : 'a list -> int -> 'a list * 'a list
Here is an example usage of the List.split function:
# let lst = [1; 2; 3; 4; 5] ;;
val lst : int list = [1; 2; 3; 4; 5]
# let (l1, l2) = List.split lst 3 ;;
val l1 : int list = [1; 2; 3]
val l2 : int list = [4; 5]
In this example, the List.split function is used to divide the list lst into two lists, with the first three elements in l1 and the remaining elements in l2.