Converse, inverse, contrapositive. CAPalert example: "If it's not suitable for children, it's not suitable for adults!"
Definition. The deletion of a vertex from a graph.
Definition. A graph is connected if...
Question. Say G is regular, and v in VG. When is the deletion again regular?
Answer (we didn't prove yet): iff v is connected to all, or to no, other vertices.
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