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开始学习

问题		答案
€ 开始学习		belongs to
-€- 开始学习		doesn't belong to
n(A) 开始学习		number of
/0/ 开始学习		empty set
ACB 开始学习		A is a subset of B
{smth} 开始学习		set
AnB 开始学习		intersection of a set/ A and B
AuB 开始学习		union of a set/ at least one of...
N 开始学习		set of natural numbers
Z 开始学习		set of integers
Z+ 开始学习		set of positive integers
Z- 开始学习		set of negative integers
Q 开始学习		set of rational numbers
Q’ 开始学习		set of irrational numbers
R 开始学习		set of real numbers
A’ 开始学习		complement of a set
C_ 开始学习		subset or equal
AnB’ 开始学习		A without B (A-B)
(AuB)’ 开始学习		union prim
AuB - AnB 开始学习		A or B but not both(the union without the intersection)
AnBnC 开始学习		all of the [...] mentioned

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