I'm writing a latex document and trying to use \lesssim (listed for example in here: http://en.wikipedia.org/wiki/Help:Displaying_a_formula#Relations ) in the text like this: $a \lesssim b$. However, after rendering the document with pdflatex, the symbol does not show up. I have included the amsmath package with
\usepackage[cmex10]{amsmath}.
Most of the similar symbols, like \leq or \ll work just fine. However, for example \gtrsim and \lessapprox don't work either.
How do I solve this? Do I need to include some other packages to get those symbols to work?
amssymb. – Torbjørn T. May 24 '13 at 12:24