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                <editor>Jos C. M. Baeten</editor>
                <editor>Tom Ball</editor>
                <editor>Frank S. Boer</editor>
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                <term xml:lang="en">weak coinduction</term>
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              <p>The aim of this paper is to introduce a coalgebraic setting in which it is possible to generalize and compare the two known approaches to defining weak bisimulation for labelled transition systems. We introduce two definitions of weak bisimulation for coalgebras over ordered functors, show their properties and give sufficient conditions for them to coincide. We formulate a weak coinduction principle.</p>
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