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<p>if the valuations is discrete.</p>

<p><big> Generalisations </big></p>
<p><big> ?-trees </big></p>
<p>If  is a <a href="page.php?w=totally_ordered_abelian_group">totally ordered abelian group</a> there is a natural notion of a distance with values in  (classical metric spaces correspond to ). There is a notion of -tree which recovers simplicial trees when  and real trees when . The structure of <a href="page.php?w=finitely_presented_group">finitely presented group</a>s acting <a href="page.php?w=Group_action">freely</a> on -trees was described.  In particular,</p><p>
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