LaTeXの数式モードでマイナスを使いたいのですが、表示されず困っております。  
環境: Texlipse, Windows 10  
エンジン: pLaTeX

```

    \documentclass{article}
    
    \usepackage[dvipdfmx]{graphicx}
    \usepackage{wrapfig}
    \usepackage{amsmath,amssymb,graphicx} %load extra symbols and environments
    \usepackage[margin=1in]{geometry} %set margins
    \usepackage{enumerate}
    \usepackage{mathtools}
    \usepackage{autobreak}
    
    \begin{document}
    
    \title{Mat}
    
    \maketitle
    $$S(\alpha , \beta , \gamma)=\sum_{i=1}^{n}\{y_{i}-(\alpha x_{i}^{2}+\beta x_{i}+\gamma)\}^2$$
    
    \end{document}
    
```

たとえばこのコードを実行すると`y_{i}`と`(\alpha`の間にあるマイナスがうまく表示されません。これを表示させるにはどうすればいいのでしょうか？  
この[サイト](https://oku.edu.mie-u.ac.jp/%7Eokumura/texonweb/)でコンパイルするとうまくいくんですが

log fileの中身も見ましたが、多分エラーなどはないと思います(見落としているだけかもしれませんので長くなってしまいますが、貼らせていただきます。)

```

    This is e-pTeX, Version 3.14159265-p3.8.3-191112-2.6 (sjis) (TeX Live 2020/W32TeX) (preloaded format=platex 2020.12.8)  12 DEC 2020 16:13
    entering extended mode
     restricted \write18 enabled.
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    LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 11.
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    LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 11.
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    LaTeX Font Info:    Checking defaults for JY1/mc/m/n on input line 11.
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    LaTeX Font Info:    Checking defaults for JT1/mc/m/n on input line 11.
    LaTeX Font Info:    ... okay on input line 11.
    *geometry* driver: auto-detecting
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    (c:/texlive/2020/texmf-dist/tex/latex/amsfonts/umsa.fd
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    LaTeX Font Info:    Trying to load font information for U+msb on input line 15.
    
    
    (c:/texlive/2020/texmf-dist/tex/latex/amsfonts/umsb.fd
    File: umsb.fd 2013/01/14 v3.01 AMS symbols B
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    LaTeX Warning: No \author given.
    
    [1
    
    ] (./ni.aux) ) 
    Here is how much of TeX's memory you used:
     3393 strings out of 479854
     49233 string characters out of 5884981
     340002 words of memory out of 5000000
     20681 multiletter control sequences out of 15000+600000
     414407 words of font info for 73 fonts, out of 8000000 for 9000
     929 hyphenation exceptions out of 8191
     66i,6n,72p,244b,263s stack positions out of 5000i,500n,10000p,200000b,80000s
    
    Output written on ni.dvi (1 page, 900 bytes).
    
    
```

もし何かわかりましたら教えていただけますと幸いです。
CC BY-SA 4.0
2020-12-12T15:22:36.363
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2020-12-12T15:22:36.363
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question
eclipse latex
LaTeXの数式モードでマイナスが表示されない