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*From*: Dominik Hansen <do.han...@xxxxxxxxxxxxxx>*Date*: Mon, 29 Apr 2013 01:54:50 -0700 (PDT)*References*: <6ccc4957-05c0-4d92-bce0-f3038e29671b@googlegroups.com> <D3D65DA6-B6AE-4D93-B141-F6C229307D20@gmail.com> <ee0d1cfb-369a-42a6-8e56-180cf119b6cd@googlegroups.com> <cff4d4e3-a12e-4362-8863-db2acd819c8a@googlegroups.com>

Dear Yuri,

in TLA+ a sequence of length n is a function with the Domain 1..n .Hence [1..n -> Data] defines the set of all sequences of length n.

The UNION-operator is used to collect all sequences of different length (from 0 to n) in a set.

Dominik

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