The undecidability of joint embedding for 3-dimensional permutation classes

25 Feb 2020 Braunfeld Samuel

As a step towards resolving a question of Ru\v{s}kuc on the decidability of joint embedding for hereditary classes of permutations, which may be viewed as structures in a language of 2 linear orders, we show the corresponding problem is undecidable for hereditary classes of structures in a language of 3 linear orders...

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