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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeSep 6th 2017
    • (edited Sep 6th 2017)

    Remind me, what do I need to type to make integral signs scale to a size appropriate for their integrands?

    I tried

     \left\int big integrand \right.
    

    but that doesn”t work.

    Here is an example that I would like to come out with larger integral symbols:

    limε0 +e ik μ(xy) μk μk μ+m 2+ik 0ε/2d p+1k =limε0 +e ik 0x 0e ik(xy)(k 0iε) 2+E ε(k) 2dk 0d pk =limε0 +e ik 0(xy) 0e ik(xy)(E ε(k)+(k 0iε))(E ε(k)(k 0iε))dk 0d pk ={2πie iE(k)(xy) 2e ik(xy)2E(k)e +iE(k)(xy) 2e ik(xy)2E(k) | x 0>0 0 | x 0<0 = \begin{aligned} \underset{\epsilon \to 0^+}{\lim} \int \frac{e^{-i k_\mu (x-y)^\mu}}{ k_\mu k^\mu + m^2 + i k_0 \epsilon /2 } d^{p+1} k & = \underset{\epsilon \to 0^+}{\lim} \int \int \frac{ e^{-i k_0 x^0} e^{- i \vec k \cdot (\vec x - \vec y)} }{ - (k_0 - i \epsilon )^2 + E_\epsilon(\vec k)^2 } d k_0 d^p \vec k \\ & = \underset{\epsilon \to 0^+}{\lim} \int \frac{ e^{-i k_0 (x-y)^0} e^{- i \vec k \cdot (\vec x - \vec y)} }{ ( E_\epsilon(\vec k) + (k_0 - i \epsilon) ) ( E_\epsilon(\vec k) - (k_0 - i \epsilon) ) } d k_0 d^p \vec k \\ & = \left\{ \array{ 2\pi i \int \frac{ e^{-i E(\vec k) (x-y)^2 e^{-i \vec k \cdot (\vec x - \vec y)}} } { 2 E(\vec k) } - \frac{ e^{ + i E(\vec k)(x-y)^2} e^{-i \vec k \cdot (\vec x - \vec y)} }{ 2 E(\vec k) } & \vert & x^0 \gt 0 \\ 0 & \vert & x^0 \lt 0 } \right. \\ & = \cdots \end{aligned}
    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeSep 6th 2017
    • (edited Sep 6th 2017)

    Hm, now that I have sent this message here, I see that here on the nForum the integral signs do scale appropriately. But on the nnLab they do not, see the present content of the Sandbox.

    • CommentRowNumber3.
    • CommentAuthorDavid_Corfield
    • CommentTimeSep 6th 2017

    Jacques Distler’s list allows for size variation as follows: \displaystyle \int, \textstyle \int, \textsize \int, \scriptsize \int, \scriptscriptsize \int.

    • CommentRowNumber4.
    • CommentAuthorMike Shulman
    • CommentTimeSep 6th 2017

    Maybe the problem is the aligned environment putting all its arguments in textstyle?

    • CommentRowNumber5.
    • CommentAuthorUrs
    • CommentTimeSep 6th 2017

    @David, thanks, but it would be useful to have it scale automatically.

    @Mike, maybe. But in #1 above I also used the aligned environment.

    • CommentRowNumber6.
    • CommentAuthorMike Shulman
    • CommentTimeSep 6th 2017

    Well certainly there is a difference between the forum and the lab, I was just suggesting what might be causing the lab to behave oddly.

    • CommentRowNumber7.
    • CommentAuthorUrs
    • CommentTimeSep 6th 2017
    • (edited Sep 6th 2017)

    Sure, thanks. So we might want to check if the “aligned”-environment behaviour for the nnLab could be tweaked. Maybe Adeel knows something about this.