Math symbol

[A-Imam Al-Sammak]

Dear all
I would like to produce the following math symbol but could not find it.
[image: image.png]
What i could find is:
[image: image.png]
Whose Latex code is

R_{x}=\dfrac{v_{f}}{i_{f}}\mid_{v_{o}=0}

Best regards.

A-Imam
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