Question in quaternion multiplication

1. Jan 12, 2015

Sciencer

Hi guys,
I am taking this class in lie groups but the professor never introduced the concept of quaternion and he asked about it. I saw from google the properties of multiplications of j and I made the multiplication according to
(B + jC)(u + jv) = Bu + Bjv + jCu + j^2Cv = Bu - Cv + j(Cu + Bv)

but in his answer its C^* and B^* so I was wondering how did he come up with that?

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2. Jan 12, 2015

Dick

B, C, u and v are not real. They are complex. They have an i component. i doesn't commute with j. Try to show $Bj=j \bar B$ get started.