Quaternions

Today I started my Quaternion Project in Mathematica. This area has fascinated me since I was in Graduate School. Prof. Plebanski was a world star in the area. Unfortunately we didn't cross as student and mentor at CINVESTAV (Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional, México). Nevertheless I could ask him once his opinion on writing General Relativity in this language. He said that he did not make much progress. Then I read Stephen L. Adler's papers on Quaternionic Quantum Mechanics in the seventies. He has a book now: Quaternionic Quantum Mechanics

Now I have an academic position and my love affair with quaternions starts today!