I get a latex error here:

```
System Message: WARNING/2 (\Chi^2)
latex exited with error: [stderr] [stdout] This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012) restricted \write18 enabled. entering extended mode (./math.tex LaTeX2e <2011/06/27> Babel <v3.8m> and hyphenation patterns for english, dumylang, nohyphenation, ge rman-x-2012-05-30, ngerman-x-2012-05-30, afrikaans, ancientgreek, ibycus, arabi c, armenian, basque, bulgarian, catalan, pinyin, coptic, croatian, czech, danis h, dutch, ukenglish, usenglishmax, esperanto, estonian, ethiopic, farsi, finnis h, french, friulan, galician, german, ngerman, swissgerman, monogreek, greek, h ungarian, icelandic, assamese, bengali, gujarati, hindi, kannada, malayalam, ma rathi, oriya, panjabi, tamil, telugu, indonesian, interlingua, irish, italian, kurmanji, latin, latvian, lithuanian, mongolian, mongolianlmc, bokmal, nynorsk, polish, portuguese, romanian, romansh, russian, sanskrit, serbian, serbianc, s lovak, slovenian, spanish, swedish, turkish, turkmen, ukrainian, uppersorbian, welsh, loaded. (/usr/local/texlive/2012/texmf-dist/tex/latex/base/article.cls Document Class: article 2007/10/19 v1.4h Standard LaTeX document class (/usr/local/texlive/2012/texmf-dist/tex/latex/base/size12.clo)) (/usr/local/texlive/2012/texmf-dist/tex/latex/base/inputenc.sty (/usr/local/texlive/2012/texmf-dist/tex/latex/ucs/utf8x.def)) (/usr/local/texlive/2012/texmf-dist/tex/latex/ucs/ucs.sty (/usr/local/texlive/2012/texmf-dist/tex/latex/ucs/data/uni-global.def)) (/usr/local/texlive/2012/texmf-dist/tex/latex/amsmath/amsmath.sty For additional information on amsmath, use the `?’ option. (/usr/local/texlive/2012/texmf-dist/tex/latex/amsmath/amstext.sty (/usr/local/texlive/2012/texmf-dist/tex/latex/amsmath/amsgen.sty)) (/usr/local/texlive/2012/texmf-dist/tex/latex/amsmath/amsbsy.sty) (/usr/local/texlive/2012/texmf-dist/tex/latex/amsmath/amsopn.sty)) (/usr/local/texlive/2012/texmf-dist/tex/latex/amscls/amsthm.sty) (/usr/local/texlive/2012/texmf-dist/tex/latex/amsfonts/amssymb.sty (/usr/local/texlive/2012/texmf-dist/tex/latex/amsfonts/amsfonts.sty)) (/usr/local/texlive/2012/texmf-dist/tex/latex/tools/bm.sty) No file math.aux. (/usr/local/texlive/2012/texmf-dist/tex/latex/ucs/ucsencs.def) (/usr/local/texlive/2012/texmf-dist/tex/latex/amsfonts/umsa.fd) (/usr/local/texlive/2012/texmf-dist/tex/latex/amsfonts/umsb.fd) ! Undefined control sequence. <recently read> \Chi l.12 $\Chi ^2$ [1] (./math.aux) ) (see the transcript file for additional information) Output written on math.dvi (1 page, 208 bytes). Transcript written on math.log.
```

Not sure wether this is an issue with my pdflatex setup.