latex support would be nice
http://mathurl.com/render.cgi?%5Cbegin%7Bbmatrix%7D%20%0Ax_%7B1%7D%20%26%20x_%7B4%7D%20%26%20x_%7B7%7D%20%5C%5C%0Ax_%7B2%7D%20%26%20x_%7B5%7D%20%26%20x_%7B8%7D%20%5C%5C%0Ax_%7B3%7D%20%26%20x_%7B6%7D%20%26%20x_%7B9%7D%20%0A%5Cend%7Bbmatrix%7D%5Cnocache