I am using the inbuilt equation editor in word and powerpoint 2013. My question is: where is there documentation of the features? There is nothing substantial in the inbuilt help, nor on Microsoft's website that I can find.

For instance, I've worked out by trial and error and browsing answers on this site that certain latex style operations will work. For example \sum + space gives the sumation sign. But is there an equivalent for matrices? (i.e something equivalent to \begin{pmatrix}... ? How would I know if there was? Has anyone compiled a list of latex operations which are recognised?