Hi, I added my algebra package.
Currently I am adding more documentation, tests and cleaning the code to prepare for a 1.0 version. The API is almost stable right now.
The algebra package let also define custom groups and rings, I did not added it in the description to keep it shorter.
Complex and Quaternion are implemented as composition algebras using the Cayley-Dickson operator over Reals, so also Octonion are implemented as well as Complexes over a custom field (for example using strings instead of numbers, if you find operators that respect the ring definition laws).
I hope algebra can enter the awesome node list.
Thanks,
Gianluca.
Closes#484
