Did you mean: Tide, Hans-Jorge
  1. Hans-Jörg Tiede (2008). Inessential Features, Ineliminable Features, and Modal Logics for Model Theoretic Syntax. Journal of Logic, Language and Information 17 (2):217-227.
    While monadic second-order logic (MSO) has played a prominent role in model theoretic syntax, modal logics have been used in this context since its inception. When comparing propositional dynamic logic (PDL) to MSO over trees, Kracht (1997) noted that there are tree languages that can be defined in MSO that can only be defined in PDL by adding new features whose distribution is predictable. He named such features “inessential features”. We show that Kracht’s observation can be extended to other modal (...)
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  2. Hans-Jörg Tiede (2003). Proof Theory and Formal Grammars: Applications of Normalization. In. In Benedikt Löwe, Thoralf Räsch & Wolfgang Malzkorn (eds.), Foundations of the Formal Sciences Ii. Kluwer. 235--256.
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