the cases environment is provided by the amsmath package- the mathtools package introduces extensions of it (dcases, etc)

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hyperref + subequations warnings

This is a follow up question to How to hide known warnings? Recently I decide to stop ignoring LaTeX warnings :), and start trying to discover what's behind them and how to avoid them in future ...
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brackets in cases

How can I control the size of brackets so that there will be symmetrical in relation of my equations? My code is: \documentclass{article} \usepackage{xltxtra} \usepackage{xgreek} ...