Terminology and Notations

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Terminology:
    • A requires clause is an operation’s precondition.
    • An ensures clause is an operation’s postcondition.
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Notations:
    • In the ensures clause, #Q denotes the incoming value of a parameter Q
    • Concatenation of (abstract string or sequence) values of two queues P and Q is denoted by P o Q.
    • To concatenate a single entry E, the notation <E> is used.
    • Length of (the abstract string or sequence value of) a queue Q is denoted by |Q|.

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