Tuple

In mathematics and computer science, a tuple is an ordered list of elements. In set theory, an (ordered) -tuple is a sequence (or ordered list) of elements, where is a positive integer. One 0-tuple, an empty sequence, also exists. An -tuple is defined inductively using the construction of an ordered pair. Tuples are usually written by listing the elements within parentheses "" and separated by commas; for example, denotes a 5-tuple. Sometimes other delimiters are used, like square brackets "" or angle brackets "". Braces "" are almost never used for tuples, since they are the standard notation for sets.