The "contains" operator/method is used to determine if an entity collection contains an element with a particular property.
The SQL intersect operator returns rows that are common between two tables without returning duplicate records.
"Given two ranges a a b and c c d do they intersect is one greater than the other or does one contains the other"
from question "In what contexts do programming languages make real use of an Infinity value?"
"Edit just checked the performance of intersect it is slower than using .all with contains"
from question "Select products that has all tags"
"I d say the intersect method see answer by dasblinkenlight + any must work better than contains + any"
from question "Check whether a List<string> contains an element in another List<string> using LINQ"