Geodesic
Coalgebras for binary methods : properties of bisimulations and invariants
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 35 (2001) no. 1, pp. 83-111

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Coalgebras for endofunctors 𝒞→𝒞 can be used to model classes of object-oriented languages. However, binary methods do not fit directly into this approach. This paper proposes an extension of the coalgebraic framework, namely the use of extended polynomial functors 𝒞 op ×𝒞→𝒞. This extension allows the incorporation of binary methods into coalgebraic class specifications. The paper also discusses how to define bisimulation and invariants for coalgebras of extended polynomial functors and proves many standard results.

Classification : 03E20, 03G30, 68Q55, 68Q65
Keywords: binary method, coalgebra, bisimulation, invariant, object-orientation 
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     author = {Tews, Hendrik},
     title = {Coalgebras for binary methods : properties of bisimulations and invariants},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {83--111},
     publisher = {EDP-Sciences},
     volume = {35},
     number = {1},
     year = {2001},
     mrnumber = {1845876},
     zbl = {0983.68126},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ITA_2001__35_1_83_0/}
}
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Tews, Hendrik. Coalgebras for binary methods : properties of bisimulations and invariants. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 35 (2001) no. 1, pp. 83-111. http://geodesic.mathdoc.fr/item/ITA_2001__35_1_83_0/