In this form, the function returns whichever of the two numbers is greater. :max(list) In this form, the function returns the largest number in the list. :max(listA, listB) This returns a list with the maximum values for each value in each spot. For example: max({1,4},{2,3}) would return {2,4} :max(value, list) This returns a list in which every value in list which is less than value is replaced with value