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math.CO2021
Isolation of connected graphs
Peter Borg
For a connected -vertex graph and a set of graphs, let denote the size of a smallest set of vertices of such that the graph obtained…
math.CO2021
The maximum sum of sizes of cross-intersecting families of subsets of a set
Peter Borg, Carl Feghali
A set of sets is called a family. Two families and of sets are said to be cross-intersecting if each member of intersects each member of $…