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Intersection (Intersection)

Intersection[list1, list2, ...]
gives a sorted list of the elements common to all the listi.
  • If the listi are considered as sets, Intersection gives their intersection.
  • The listi must have the same head, but it need not be List.
  • Intersection[list1, ..., SameTest->test] applies test to each pair of elements in the listi to determine whether they should be considered the same.
Find elements common to all the lists given:
Enter using Esc inter Esc:
Find elements common to all the lists given:
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Click for copyable input
Out[1]=
 
Enter using Esc inter Esc:
In[1]:=
Click for copyable input
Out[1]=
Intersection works with any head, not just List:
Find divisors common to 45 and 78:
If there is no intersection, the result is {}:
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