I know that a joint $u$ means that if $G - u$ then $G$ isnt connected anymore, but i dont know how to use that definition in order to reach the proof. The proposition makes logical sense given the definition of the complement of $G$ but i dont even know how to start

  • $\begingroup$ If a joint vertex is the same as a cut vertex, then this question has an excellent answer here. $\endgroup$
    – kabenyuk
    Sep 27 '21 at 9:15

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