How can I produce a long over-arrow for a symbol in Latex?

[Math Amateur]

I recently posted on the Analysis forum regarding a remark by Jacques Lafontaine ... the remark contained a symbol which involved a long over-arrow on the top of f(a)f(x) as you can see at the start f the remark below:View attachment 8516My attempt to produce the long over-arrow was to use the Latex Code \vec{ f(a) f(x) } ... but this only produced a short over-arrow as follows:

$$\vec{ f(a) f(x) }$$ ... ...How do I produce a long over-arrow like that in the text from Lafontaine ...

Peter

 

[MarkFL]

Hello, Peter! (Wave)

This code:

\overrightarrow{f(a)f(x)}

produces:

$$\overrightarrow{f(a)f(x)}$$

 

[Evgeny.Makarov]

Also I recommended a small package [M]esvect[/M], which allows drawing long arrows with different arrowheads.

 

[Math Amateur]

Also I recommended a small package [M]esvect[/M], which allows drawing long arrows with different arrowheads.

Thanks Evgeny ...

I appreciate your help...

Peter

- - - Updated - - -

Hello, Peter! (Wave)

This code:

\overrightarrow{f(a)f(x)}

produces:

$$\overrightarrow{f(a)f(x)}$$

Thanks Mark,

Peter