2023年9月10日
https://www.mathsisfun.com/sets/number-types.html
There are sets of numbers that are used so often they have special names and symbols:
Symbol
Description
Natural Numbers
The whole numbers from 1 upwards. (Or from 0 upwards in some fields of mathematics). Read More ->
The set is {1,2,3,...} or {0,1,2,3,...}
Integers
The whole numbers {1,2,3,...}, negative whole numbers {..., -3,-2,-1} and zero {0}. So the set is {..…