MSO+∇ is undecidable

Mikolaj Bojanczyk, Edon Kelmendi, Michal Skrzypczak. MSO+∇ is undecidable. In 34th Annual ACM/IEEE Symposium on Logic in Computer Science, LICS 2019, Vancouver, BC, Canada, June 24-27, 2019. pages 1-13, IEEE, 2019. [doi]

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