Reflections on and of minor-closed classes of multisorted operations |
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| Authors: | Erkko Lehtonen Reinhard Pöschel Tamás Waldhauser |
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| Institution: | 1.Institut für Algebra,Technische Universit?t Dresden,Dresden,Germany;2.Bolyai Institute,University of Szeged,Szeged,Hungary |
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| Abstract: | The minor relation of functions is generalized to multisorted functions. Pippenger’s Galois theory for minor-closed sets of functions is extended to multisorted functions and multisorted relation pairs. Reflections of minor-closed sets are again minor-closed, and the effect of reflections on the invariant relation pairs of minor-closed sets of multisorted functions is described. |
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