title: Greek nu (Tex) in matplotlib legend
body: <p>I'm plotting with matplotlib.pyplot and I am trying to use the Tex \nu letter in a plot label.
  However, with <code>label='$B_\nu(\nu, T)$'</code>, I get linebreak+u in the plot legend, since \n is interpreted as a new line. I also tried <code>label='$B_{\nu}({\nu}, T)$'</code>, which give the same result plus {} in the output. How can I get nu to work in the legend?</p>