Mixed discontinuous Galerkin approximation
of the Maxwell operator: The indefinite case

Paul Houston; Ilaria Perugia; Anna Schneebeli; Dominik Schötzau

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The infinite Post Correspondence Problem (PCP) was shown to be undecidable by Ruohonen (1985) in general. Blondel and Canterini [ (2003) 231–245] showed that PCP is undecidable for domain alphabets of size 105, Halava and Harju [ (2006) 551–557] showed that PCP is undecidable for domain alphabets of size 9. By designing a special coding, we delete a letter from Halava and Harju’s construction. So we prove that PCP is undecidable for domain alphabets of size...