data streamDataStream2005-12-27 07:46:372007-06-23 14:48:47DefinitionStream of Tuplessequence% this is the default PlanetMath preamble. as your knowledge
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\usepackage{amssymb}
\usepackage{amsmath}
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% there are many more packages, add them here as you need them
% define commands hereA {\it data stream} is an ordered pair $\left( s,\Delta \right) $
where:
1. $s$ is a sequence of tuples,
2. $\Delta $ is the sequence of time intervals (i.e. rational or real numbers) and each $\Delta _{n} > 0$