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How to write a vector in Latex
To write a vector in Latex, we can use \vec function
$\vec{AB} = 0_E$
$$\vec{AB} = 0_E$$
or\overrightarrow function
$\overrightarrow{AB} = 0_E$
$$\overrightarrow{AB} = 0_E$$
Note: as Keyboard warrior said in the comments \overrightarrow function looks more like the vector symbol(s) we see in textbooks.