I want to use this symbol for the product integral:

product integral

Perhaps with a bigger loop, too. What's the best way of building this notation?

I got it to work for just the integral sign itself.


{\adjustbox{trim = 0pt 0pt 0pt 0.15\height, clip} {$\displaystyle\int$} 
{\hspace{-0.45em} \mathrel{\raisebox{0.9em}{$\rho$}}}}

$$|\psi(t)\rangle=\Prodint U_t(dt)|\psi(0)\rangle$$

Time evolution of quantum state

But its behaviour with (especially lower) limits is really bad.

$$|\psi(t)\rangle=\Prodint_0^T U_t(dt)|\psi(0)\rangle\ne\int_0^T U_t(dt)|\psi(0)\rangle$$

enter image description here

How can I get the lower limit to be placed like in the standard \int (see above for reference)?


If you're happy with the symbol, set the lower limit together with the integral, then add the upper limit to the whole block.


   \adjustbox{trim = 0pt -0.5pt 0pt 0.15\height, clip}{$\displaystyle\int\IfValueT{#2}{_{#2}}$}%


\int_0^T f(t)\,dt \ne
\Prodint_0^T f(t)\,dt


enter image description here

  • Thanks. Question: did the addition of the -0.5pt to the trim actually change anything? It didn't change anything for me. Also, how do the e notation work -- do the ^ and _ just represent #1 and #2 but with fancier notation than using square brackets? Is there some documentation for this, where it can be used? Aug 19 '19 at 8:47
  • @AbhimanyuPallaviSudhir Without it the lower limit could be cut because characters may overshoot a bit. Try with 0pt and you'll see.
    – egreg
    Aug 19 '19 at 9:41
  • @egreg Thank you very very much to have help the user Abhimanyu Pallavi Sudhir. Always thank you and I write it with all my heart.
    – Sebastiano
    Aug 19 '19 at 12:21

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