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7
votes
Fraïssé limits and groups
group-theory
logic
model-theory
asked Dec 4 '11 at 3:10
math.stackexchange.com
6
votes
Using the compactness theorem to show a set of first-order formula is equivalent to a set of quantifier-free formula
homework
logic
model-theory
asked Dec 11 '11 at 7:26
math.stackexchange.com
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