MathJax: Rich Math display from LaTeX and MathML

MathJax: Rich Math display from LaTeX and MathML

The Cauchy-Schwarz Inequality

\[ \left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right) \]

google docs的方程式編輯器

他的語法為: \sum_{i=1}^{n}{i^2} =\frac{n(n+1)(2n+1)}{6}
圖檔連結為: http://chart.apis.google.com/chart?cht=tx&chs=1x0&chf=bg,s,FFFFFF00&chco=000000&chl=%5Csum_%7Bi%3D1%7D%5E%7Bn%7D%7Bi%5E2%7D%20%3D%5Cfrac%7Bn%28n%2B1%29%282n%2B1%29%7D%7B6%7D