mutual exclusion

Mutual Exclusion is the method by which one can ensure that a region of memory cannot be accessed by two processes at the same time.
In logic terms, it can described as possibilities where you cannot have more than one be true at a time.

http://en.wikipedia.org/wiki/Mutual_exclusion

subset

A subset is a set which every element in the set is contained in a larger or equal size set. In other words a set with in a set.

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The set of {2,4,6} would be a subset of the set {0,2,4,6,8}.