Integers: a set of numbers, I = {.., -5,-4,-3,-2,-1,0,1,2,3,4,5,..}

              positive integers  are whole numbers greater than Zero, e.g. 1, 2, 3, 4, 5, ..., 6734

              negative integers  are numbers less than Zero, e.g. -1, -2, -3, -4, -5, ..., -6734

              zero  is neither a positive nor a negative integer, 0