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General rule product matrices?

  1. Jun 4, 2013 #1
    Hi everyone,

    I'm trying to find a general rule that expresses the product of two rotation matrices as a new matrix.
    I'm adopting the topological model of the rotation group, so any rotation which is specified by an angle [itex]\phi[/itex] and an axis [itex]\hat{n}[/itex] is written [itex]R(\hat{n}\phi)= R(\vec{\phi})[/itex].

    So, given two rotation matrices [itex]R(\vec{\phi}_1) , R(\vec{\phi}_2) \in SO(3)[/itex], what can be said about the product [itex]R(\vec{\phi}_1)R(\vec{\phi}_2)[/itex]?

    What is are the axis and the amount of degrees that specifies this rotation matrix?
     
  2. jcsd
  3. Jun 6, 2013 #2

    tiny-tim

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