Cross-intersecting family

Two set families

A

and

B

are cross-intersecting when

A \cap B \neq = \emptyset

for every

A \in A

and

B \in B

.

 Ancestors (7)

 Incoming links (1)

Past exam of the mathematics course of the University of Cambridge / 2025 / iii / Paper 109 / 2 / ii / Solution

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