Add Rotation Matrix and Vector classes for 2D, 3D and generic sized spaces
2D and 3D calculations could benefit from optimized functions for Rotation Matrices, 2D and 3D vectors, Solving for Transformation or Rotation Matrices, using Quaternions, and more.
Mohammed Khoory commented
+1 for Quaternions. AFAIK, Math.NET Iridium had support for it, but it was discontinued because it was merged to Math.NET numerics. However, Quaternion didn't seem to be part of the merge process unfortunately. It'll be sweet if it can be included. Things like rotation matrices and quaternions are used a lot in 3D graphics and gaming, so I think it'll find a lot of use.