How can I write a contour integration in Mathematics Stack Exchange? [duplicate]

How can I write a contour integration (from complex analysis) in Mathematics Stack Exchange?

I have many questions relating to contour integration in complex analysis, but I don't know how to write a contour integration. There is no 'contour' option on my keyboard.

If anybody helps me, I would be very thankful.

• $$\int_\gamma f(z)dz, \qquad \int_{|z| = 1} f(z)dz, \qquad \int_{0 \to 1 \to 1+i \to i \to 0} f(z)dz$$ – reuns Aug 18 '17 at 15:37
• \oint (in math mode) gives $\oint$. – Andrés E. Caicedo Aug 18 '17 at 21:25
• – Martin Sleziak Aug 18 '17 at 21:30
• This is a question for tex stackexchange imo. You can also use detexify – Fakemistake Aug 18 '17 at 21:38
• @Fakemistake I think that questions about MathJax (as opposed to LaTeX) are fine here - in fact you can see many past questions in (mathjax) tag. There was a discussion where or not they are on-topic on TeX.SE: How do we feel about MathJaX/jsMath/other spin-offs? – Martin Sleziak Aug 18 '17 at 21:45