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I’ve created the entry Ehrenfeucht-Fraïssé games and recorded the basic definitions and results (partly inspired by jesse’s efforts to add some model theory content to the nlab). I’m running out of steam now, but we should also mention the connections to quantifier elimination and Scott rank. (I’ve added a redirect from back-and-forth argument which was requested at quantifier elimination.)
This looks great. Thanks, Ulrik!
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