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A tuple is a finite list of elements that can be used to represent a data item
or a message. Tuples can represent, for example, GPS coordinates
dates <1984, "September", 13>
user credentials
<1984, "September", 13>groceries missing in the fridge
<"milk">and so on.
A tuple space is a collection of tuples. In general, the term collection has to be understood in the more general sense. However, the traditional interpretation is to consider the simple case of unordered collections of tuples, i.e. multisets of tuples. Recall that a multiset differs from a set in that an element can appear more than once. It is worth to remark that a multiset differs from a list in that the order of elements does not matter.
The above is an exempt from "Lafuente, A. L., (January 2, 2017), Teaching material for 02148 “Introduction to Coordination in Distributed Applications”, Technical University of Denmark"