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I'm using MikTex on Windows 10.

I wanted to write the following equation:

\underbrace{\frac{\partial\rho\phi }{\partial t}}+\underbrace{\nabla\cdot 
(\rho u \phi)}-\underbrace{\nabla\cdot (\rho \nabla\phi)}=\underbrace{S}

What i am getting is:

enter image description here

These are the packages I am using:

\usepackage{hyph}
\usepackage{lscape}
\usepackage[T1]{fontenc}
% Naturwissenschaftliche Bibliographien
\usepackage[square, comma, numbers, sort&compress]{natbib}
\usepackage[utf8]{inputenc} % geändert auf utf8
\usepackage{fancyhdr}
\usepackage[dvips]{graphicx}
\usepackage{color}
\usepackage{longtable}
\usepackage{supertabular}
\usepackage{svg}
\usepackage{dashrule}
\usepackage{tabularx}
\usepackage{lscape}
\usepackage{slashbox}
\usepackage{pict2e}
\usepackage{afterpage}% \afterpage{\clearpage} um float-Speicher zurückzusetzten
\usepackage[onehalfspacing]{setspace} % Veränderung des Zeilenabstands
\usepackage{latexsym}
\usepackage{float,rotating}
\usepackage{caption}
\captionsetup[table]{position=above}
\captionsetup[figure]{position=below}
\captionsetup{format=hang, labelformat=simple, labelsep=colon, justification=raggedright, singlelinecheck=off, labelfont=bf, textfont=normalfont}
%Fremdsprachen
%------------------------
\usepackage[ngerman]{babel}
\usepackage[babel, german=quotes]{csquotes}
\usepackage{textcomp}
%Abbildungen
%------------------------
\usepackage{subfig}
\usepackage{booktabs}
\usepackage{epstopdf}
%
%Formeln und Gleichungen
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{enumerate}
\usepackage{remreset}
\usepackage{stmaryrd} %definiert u.a. \minuso als Symbol für Standardbedingungen
\usepackage{dcolumn}
\usepackage{multirow}
\usepackage{fdsymbol}  
\usepackage{hyperref} 
\usepackage{pgfplots} 
%SI-Units
\usepackage{siunitx}

Can anyone help me out where the problem is?

Best regards,

Gesetzt

Gesetzt
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    Welcome to TeX.SE! You'll get feedback much more quickly if you provide a complete MWE. For instance, it is not clear which document class you are using. –  Mar 22 '18 at 23:49
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    May not be related to the problem, but do you actually need all those packages? At the very least, you can do without latexsym since you are loading amsymb, and I don't think there is any benefit to loading epstopdf on modern installations. Generally, I think it's best to only load the packages that your document actually uses. – Ian Thompson Mar 22 '18 at 23:53
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    Apart from the fact that hyph and slashbox are not on my TeX distribution, I have no problem. But I warn you about fdsymbol, which changes all math symbols in ways that are incompatible with the main text font. – egreg Mar 23 '18 at 00:10
  • I’d recommend unicode-math over just about any combination of legacy symbol packages, if you’re allowed to use it. Any modern Opentype math font will have a more complete, visually-consistent set of symbols than is even possible with the legacy math alphabets, and makes scaling and replacing characters much easier. Next-best is stix, and potentially mathalfa. – Davislor Mar 23 '18 at 13:46
  • With this package list, you should move \usepackage{textcomp} further up, perhaps right after \usepackage[T1]{fontenc}. The textcomp package activates the TS1 encoding, and certain packages, including inputenc and some fonts, won’t be able to use TS1 symbols properly unless textcomp is loaded first. (If any other packages need to be loaded before textcomp, or load it themselves with different options, that’s annoying.) Or you could just use unicode-math. – Davislor Mar 23 '18 at 13:51

1 Answers1

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The problem lies to fdsymbol package. At page 19 of package documentation is stated that nabla symbol and others are missing. enter image description here enter image description here Imho you should try to use another symbol package or take a look at this question. I would also recommend, if there is no other need to choose one of the math fonts stated here.

mhtsort
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