What is the relationship between the number set in mathematics
What is the relationship between the set of numbers in mathematics? What is the problem? Does it mean the following:
N ≤ Z ≤ Q ≤ R ≤ C, (sorry, can't find the containing symbol, use ≤ instead)
Here, from left to right, the letters above represent natural number set, integer set, rational number set, real number set and complex number set