intersection

set theory

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In formal logic: Set theory
The intersection of x and y, symbolized as x ∩ y, is the class the members of which are the objects common to x and y—in this case the dots within the area where the arms cross—i.e., {z : z ∊ x · z ∊ y}.…
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In set theory: Operations on sets
The intersection operation is denoted by the symbol ∩. The set A ∩ B—read “A intersection B” or “the intersection of A and B”—is defined as the set composed of all elements that belong to both A and B. Thus, the intersection of the two committees…
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