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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:

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

Peter

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

Peter