Markdown automatically escapes ampersands and angle brackets within a code block, so how is it possible to use special characters that require escaping for example: λ ?
I know that one solution is to edit the HTML output file, however my markdown is for a GitHub page and I don't have access to the generated file.
I use ReText and it allows me to insert a lambda directly in the editor and the preview shows it as well. GitHub's view only shows a small "image missing" type of box.
Best Answer
Use HTML entities style to insert special characters. For example writing
will produce a λ
See this Wikipedia page for the complete reference.