1

2

3

4

5

6

7

$A=\{1,2,3,5,7\}$

$B=\{2,4,6,7\}$

$A\cap B=\{2,7\}$

$A\cup B=\{1,2,3,4,5,6,7\}$

B

A

和事象

事象

事象

積事象

A = (1.6, 2.12)
B = (5.2, 2.18)
c = Circle(B, A)
C = (0.36, 2.14)
D = (3.98, 2.14)
d = Circle(C, D)
n = 1 (slider from 1 to 4, step 1)