Proved that
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Originally Posted by soso123 Proved that This is just a matter of applying definitions. $\displaystyle \overrightarrow {AB} = \overline {AB} \cup \left\{ {X:A - B - X} \right\}$. Now combine that with $\displaystyle \overrightarrow {BA}$ to get the set $\displaystyle \overleftrightarrow {AB}$.
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