EXAMPLE 2 80t8 集合 The set o of odd positive integers less than 10 can be xpressed by O={1,3,5,7,9} O={x|x>=1∧x<=10∧ x is odd number} A={a,b,c,…,n}枚举法 A={x|x∈P(x)}谓词公式法/ set builder 2/24/202111:15PM Deren Chen Zhejiang univS e t s 集合 2/24/2021 11:15 PM Deren Chen, Zhejiang Univ. 5 EXAMPLE 2 The set O of odd positive integers less than 10 can be expressed by O = {1, 3, 5, 7, 9}. O = {x | x >=1 ∧ x <=10 ∧x is odd number}. A = {a, b, c, …… n} 枚举法 A = {x | xP(x)} 谓词公式法/set builder