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Paper detail

Trois couleurs: A new non-equational theory

A first-order theory is equational if every definable set is a Boolean combination of instances of equations, that is, of formulae such that the family of finite intersections of instances has the descending chain condition. Equationality is a strengthening of stability yet so far only two examples of non-equational stable theories are known. We construct non-equational $ω$-stable theories by a suitable colouring of the free pseudospace, based on Hrushovski and Srour's original example.

preprint2020arXivOpen access
Amador Martin-PizarroMartin Ziegler
math.LO
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Amador Martin-PizarroMartin Ziegler

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