1. Sliced two sets (Intersection)
Of the two sets C and D we can create a new set E whose members include the element C that also includes elements of D. New set of E is called the set of slices C and D.
The set of slices are written C ∩ D, read: the set of slices C and D. So this example can be written E = C ∩ D, reads: The set E is the set of slices C and D.
By writing the shaper set: E = C ∩ D = {x | x ∈ C and x ∈}
With Venn diagram:
Fig. 4. 
For example:
If C = {-1, 0, 1, 2, 3, 4, 5} and D = {1, 3, 5, 7, 9}, then E = C ∩ D = {1, 3, 5}
If A = { inhabitant of Jakarta }, and B = { the people who speak English }, then A ∩ B = {the people of Jakarta who speak English }
