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Bug introduced in 13.0 or earlier. Fixed in 13.2.0 or earlier.

Why do I get this error? I don't do any calculation with this. I just want to use TeXForm and then wrap MaTeX around it.

TeXForm["\!\(\*SubsuperscriptBox[\(\[Integral]\), \(0\), \
\(2\)]\)\!\(\*SubsuperscriptBox[\(\[Integral]\), \(-\*FractionBox[\
\(\[Pi]\), \(2\)]\), FractionBox[\(\[Pi]\), \
\(2\)]]\)\!\(\*TagBox[FractionBox[RowBox[{SuperscriptBox[\"r\", \
\"2\"], \" \", RowBox[{\"(\", RowBox[{\"cos\", \" \", \"\[Theta]\"}], \
\")\"}], \" \", \
SuperscriptBox[RowBox[{\"(\", RowBox[{RowBox[{\"-\", \"1\"}], \"+\", \
RowBox[{\"r\", \" \", RowBox[{\"(\", RowBox[{\"sin\", \" \", \"\
\[Theta]\"}], \")\"}]}]}], \
\")\"}], \"3\"]}], RowBox[{\"1\", \"+\", SuperscriptBox[\"r\", \
\"2\"]}]],HoldForm]\)dr d\[Theta] = -\!\(\*FractionBox[\(16\\ \
\[Pi]\), \(3\)]\)"]

enter image description here

And this is the result when I run in another computer.

enter image description here

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7
  • 1
    $\begingroup$ Why do you use TeXForm on a string? $\endgroup$
    – Carl Woll
    Apr 16, 2022 at 21:44
  • $\begingroup$ @CarlWoll I think I tried without string but I got error so I added the string mark. $\endgroup$
    – hana
    Apr 16, 2022 at 21:45
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    $\begingroup$ The infinite recursion is a bug, pure and simple. I will report it. $\endgroup$
    – Daniel Lichtblau
    Apr 17, 2022 at 18:06
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    $\begingroup$ The answer to the question raised in the subject header, which I'm sure I'll need to delete soon, is "Because TeXForm hates us and wants us to be miserable". $\endgroup$
    – Daniel Lichtblau
    Apr 17, 2022 at 21:12
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    $\begingroup$ @bmf TexForm breaks this law by actually increasing misery. Think of it as entropy I guess. $\endgroup$
    – Daniel Lichtblau
    Apr 18, 2022 at 17:47

1 Answer 1

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In light of the comment by @Daniel Lichtblau the following is a workaround to the bug that is present

Edit: addressing all the comments

edit1

The code is given below:

MaTeX[TeXForm[
  HoldForm@
    Integrate[(r^2 Cos[\[Theta]] (-1 + r (Sin[\[Theta]]))^3)/(
     1 + r^2), {r, 0, 2}, {\[Theta], -Pi/2, Pi/2}] == 
   Integrate[(r^2 Cos[\[Theta]] (-1 + r (Sin[\[Theta]]))^3)/(
    1 + r^2), {r, 0, 2}, {\[Theta], -Pi/2, Pi/2}]]]

Original answer

I am not 100% sure why it happens. I checked that by copying and pasting your code in my notebook, I also had the errors. I think it has to do with the HoldForm and perhaps the RowBox. See below:

I started coding your expression afresh. It worked fine.

res

The code used

TeXForm["\!\(\*SuperscriptBox[SubscriptBox[\(\[Integral]\), \(0\)], \
\(2\)]\)\!\(\*SuperscriptBox[SubscriptBox[\(\[Integral]\), \
\(-\*FractionBox[\(\[Pi]\), \(2\)]\)], FractionBox[\(\[Pi]\), \(2\)]]\
\) \!\(\*FractionBox[\(\((cos\\\ \[Theta])\) \*SuperscriptBox[\((\(-1\
\) + r \((sin\\\ \[Theta])\))\), \(3\)]\), \(1 + \*SuperscriptBox[\(r\
\), \(2\)]\)]\) dr d\[Theta]=-\!\(\*FractionBox[\(16  \[Pi]\), \(3\)]\
\)"]

Note that I grabbed the code posted here and tried it in a fresh kernel and worked with no issues.

res2

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  • $\begingroup$ thanks, your code works in my another computer but if I copied my code above then I also got error. $\endgroup$
    – hana
    Apr 16, 2022 at 21:41
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    $\begingroup$ @hana yes, it makes sense. It probably has something to do with HoldForm and/or RowBox as I mentioned in my answer. Not sure how you got those though. $\endgroup$
    – bmf
    Apr 16, 2022 at 21:43
  • $\begingroup$ Oh, yea, I forgot to remove it. I used it to replace Cos[x] to cos(x) form. $\endgroup$
    – hana
    Apr 16, 2022 at 21:44
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    $\begingroup$ @hana ok, so it seems that this is causing the issue. I wrapped my code around MaTex and works fine. You can try MaTeX[TeXForm[codefromabove]] just to make sure. $\endgroup$
    – bmf
    Apr 16, 2022 at 21:47
  • 1
    $\begingroup$ oh, that is great and I didn't get that was what you were saying. $\endgroup$
    – hana
    Apr 16, 2022 at 22:56

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