what's wrong with my setting so that \dfrac not working?

[Elim Qiu]

url:   math.elinkage.net

MathJax Version: 2.4

Or something wrong with the version of  mybb?

[Peter Krautzberger]

Hi,

The problem is some bad code and bad placement of the configuration -- see the docs for more information on how to configure MathJax.

Something like 

        <script type="text/x-mathjax-config">

          MathJax.Hub.Config({

           jax: ["input/TeX","output/HTML-CSS"],

           extensions: ["tex2jax.js","MathMenu.js","MathZoom.js"],

           tex2jax: {   

              inlineMath: [['$','$'],['\\(','\\)']], // uncomment to use $...$ for inline math

              processEscapes: 1                      // set to 1 to allow \$ to produce a dollar sign

            },

           TeX: {

              extensions: ["AMSmath.js","AMSsymbols.js"]

           }

          });

        </script>

        <script type="text/javascript" src="path-to-MathJax/MathJax.js">

should work. 

You might get better performance with a combined configuration file, e.g., this one. E.g.,

        <script type="text/x-mathjax-config">

          MathJax.Hub.Config({

           tex2jax: {   

              inlineMath: [['$','$'],['\\(','\\)']], 

              processEscapes: 1        

            }

          });

        </script>

        <script type="text/javascript" src="path-to-MathJax/MathJax.js?config=TeX-AMS_HTML-full">

would also suffice. Of course, you can also load things from the CDN.

Regards,

Peter.

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[Elim Qiu]

Thanks a lot Peter for the comments. I do need to look at the document.