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Created Fraïssé limit.
(I was pleasantly surprised to see @David_Corfield had posted about the these things a while ago for the n-Category Cafe.)
Mentioned a neat result of Olivia Caramello’s that omega-categorical structures presentable as Fraisse limits are determined by their automorphism groups $G$ with the topology of pointwise convergence in a very nice way: their classifying toposes are precisely the toposes of continuous $G$-sets.
To fill in a grey link, I also created an entry for the countable random graph.
I hope the discussion at the Cafe got things right in the end. I recall plenty of terminological confusion about what kind of limits and embeddings were involved.
I see my follow-up didn’t generate much discussion.
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