Mathematics, Math, Programming, Discrete Mathematics.
general format is: check if a collection of elements ⊆ (is contained as a member) in a set. {1, 3, 4}⊆{1, 2, 3, 4, 5} is true What reads above is the following: check to see if the elements 1, 3, 4 exist in the set {1, 2, 3, 4, 5}. The brackets for the collections matter a lot. For instance, the