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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

`$$\overrightarrow{AB} = 0_E$$`

$$\overrightarrow{AB} = 0_E$$

Note: as *Keyboard warrior* said in the comments **\overrightarrow** function looks more like the vector symbol(s) we see in textbooks.