Collection
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Cohesive set

Ultra forbidden set
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[1] Cohesive set is a kind of super forbidden set. If A is an infinite set, it cannot be set by any:. A set is divided into two infinite parts, that is, for any:. Set adjacency, at least one of Wemen A and Bumen A is a finite set. Then A is called internal aggregation. Cohesive sets exist, in fact, any infinite set contains internal aggregation. Therefore, there are two internal aggregations. In addition, internal aggregation must be hh forbidden. When A is internal aggregation, A must not be internal aggregation
Chinese name
Cohesive set
Foreign name
cohesive set
Category
A kind of ultra forbidden set