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I want to type this equation,

enter image description here

however I am struggling with \mathcal and \mathbb,

Here is my code, can anyone tell me what's wrong to my code and how to fix it? Thanks!

\begin{equation} \min _{W} \underset{(x, y) \sim \mathcal{D}}{\mathbb{E}} \mathcal{L}(W ;(x, y)) \end{equation}

What I am having is: The letter E, and D did not display as expected

enter image description here

Solved: the package of \usepackage{breqn} disrupted the compilation. When I remove this line, the problem is resolved.

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    Are there blank lines after the \begin{equation} and before the \end{equation} in your code? There can't be empty blank lines in \begin{equation}...\end{equation}, the will cause errors. If I remove those lines, the following document compiles fine and without errors to what I would expect: gist.github.com/moewew/dd09718e521ec381cf6709095147d52e Commented Jul 25, 2021 at 10:39
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    You may want to have a look at tex.stackexchange.com/q/56765/35864 to make \mathbb{E} behave more like \min w.r.t. subscript placement. Commented Jul 25, 2021 at 10:42
  • @moewe I dont have blank lines, this compiles well however the letter "E" isn't displayed as expected... Commented Jul 25, 2021 at 11:14
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    Please add an MWE Commented Jul 25, 2021 at 11:36
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    You need \usepackage{amssymb}. Commented Jul 25, 2021 at 12:28

1 Answer 1

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According totally with the comments of @moewe and @DG' here I add a minimal compilable code, where you can obtain, correctly, your expected 2nd image.

\documentclass[a4paper,12pt]{article} \usepackage{mathtools,amssymb} \begin{document} \begin{equation} \min_{W} \underset{(x, y) \sim \mathcal{D}}{\mathbb{E}} \mathcal{L}(W ;(x, y)) \end{equation} \end{document}

The snapshot is:

enter image description here

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  • @kegemo and now you know why asking for a full but minimal example is more than 50% of all comments around here, we cannot solve problems without it Commented Jul 25, 2021 at 13:05
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    OK, I have found that I have included the package of breqn disrupted the compilation. When I remove the line of \usepackage{breqn}, this problem is solved. Thanks! Commented Jul 25, 2021 at 13:05
  • @kegemo You're welcome and glady to help you. Commented Jul 25, 2021 at 22:07

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