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Let $G$ be a connected graph. For a vertex $x$ of $G$ we denote by $G−x$ the graph formed by removing $x$ and all edges incident on $x$ from $G$. $G$ is said to be good if there are at least two distinct vertices $x, y$ in $G$ such that both $G − x$ and $G − y$ are connected.

  1. Show that for any subgraph $H$ of $G$, $H$ is good if and only if $G$ is good.
asked in Set Theory & Algebra by Veteran (76k points)   | 25 views

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