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Omni-MATH / Let S be a set of size 3. How many collections T of subsets of S have the property that for any two subsets U∈T and V∈T, both U∩V and U∪V are in T ? · Discussion

Discussing Let S be a set of size 3. How many collections T of subsets of S have the property that for any two subsets U∈T and V∈T, both U∩V and U∪V are in T ? · Omni-MATH

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