# How to write a downside arrow over a letter?

#### Zoli

Greetings,

I would like to put a downside arrow over a letter in LaTeX, how could I do it? I need it for the convective term of the Navier-Stokes equations to mark which velocity the $$\displaystyle \nabla$$ acts on.

Thank you,
Zoli

#### romsek

MHF Helper
I'm not seeing what a "downside arrow" is. Do you mean an arrow to mark a variable as a vector as in $\vec{v}$ ?

#### Zoli

I mean an arrow that points downwards: for example if the arrow in $$\displaystyle \vec{v}$$ would be be rotated -90 degrees, that would be OK.

#### romsek

MHF Helper
I mean an arrow that points downwards: for example if the arrow in $$\displaystyle \vec{v}$$ would be be rotated -90 degrees, that would be OK.
$\overset{\downarrow}v$

#### Zoli

Yes, I would like that one.

#### romsek

MHF Helper
Yes, I would like that one.
\overset{\downarrow}{v}

$\overset{\downarrow}{v}$

Last edited:
3 people

#### topsquark

Forum Staff
You might find this site to be of help.

-Dan

1 person

#### Zoli

Thank you very much!