In the Lathi-Ding's book on communication systems, there is a strange wavy overbar as it is shown in the attached figure ... how can i use it in LaTEX?enter image description here

  • This suggests the creation of a package olem (cf. ulem).
    – Sigur
    Jun 1, 2018 at 20:28

1 Answer 1


You can use the \lfilet growing delimiter of mathabx, sized to the width of the material and rotated.


\DeclareFontShape{U}{mathx}{m}{n}{ <-> s*[0.6]mathx10 }{}

    #1\left\lfilet\vbox to 0.55\wd\z@{}\right.


P_g = \overfilet{g^2(t)} + \overfilet{g(t)g(t\pm\tau)}


enter image description here

With s*[0.4]mathx10 instead of 0.6, the output would be

enter image description here

  • 2
    Amazing. The 0.4 option looks better to me.
    – Sigur
    Jun 1, 2018 at 20:40

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