## About writing LaTex Formulas online and on WordPress

Online LaTex Equation Editor (this is similar to Scientific Workplace)

Latex Lab Project (hosted at Google Code) and LaTex to PDF can help write LaTex codes and compile codes without installing MikTex system on your local computer.

Online instructions and forums:

- Harvard Mathematics Department Computing: LaTex
- Cambridge University: Text Processing using LaTeX
- TeX Users Group
- Ink Scape is a free software for editing EPS graphic files. The EPS image file can be previewed on the webpage Online EPS Image Viewer.

The codes for the formula on WordPress.com are

$ latex cov(X,Y)=\mathbb{E}\left( cov(X,Y|Z)\right) +cov(\mathbb{E}(X|Z),\mathbb{E}(Y|Z)) $

where $ latex must stick together without a space. The reason that I separated $ from the word latex is that I want to avoid that formula from being displayed again so that purely codes are shown above.

## Using Mathematica to Illuminate Ideas & Some Online Calculators

Wolfram launches a demonstration project that uses animations to illuminate some mathematical ideas. For example, this Random Branching Process animation demonstrates a Markov process that models a population in which each branch (or individual) splits into two with a certain probability.

The following are some interesting online math calculation tools. Online Matrix Calculator , Wolfram Integrator , Wolfram WebMathematica

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