Intersection of whole numbers and natural numbers

AB: Lesson Natural and Whole Numbers

This question sounds simple, but it is sure to be answered incorrectly by many. The natural numbers end at 1 or 0, as described in the previous exercise. "Small" means that we subtract -1 until we get to the smallest element of this set of numbers. With natural numbers you could start with 5 and calculate 5-1 = 4, 4-1 = 3, 3-1 = 2, 2-1 = 1. Less than 1 is not possible. Whole numbers, on the other hand, include all negative numbers. That means, if we are looking for the "smallest" element, we always have to subtract -1. If we start with 2, the result is 2-1 = 1, 1-1 = 0, 0-1 = -1, -1-1 = -2, -2-1 = -3, ... As we can see, we can always subtract -1 and get a new, smaller number. As a reminder, -10 for example is less than -4 (imagine the thermometer here). So there is no smallest number in whole numbers. By the way, you cannot write -∞ (minus infinity) for this exercise, since this symbol does not represent a number.