Question #227868 on Yade changed:
https://answers.launchpad.net/yade/+question/227868

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
Could you elaborate your question? What/why is wrong?

If omega_c was the spin of the contact, then the relative spin of each
sphere would be  (omega_1-omega_c) and  (omega_2-omega_c)

Then the relative spin 2 wrt. 1:
(omega_2-omega_c) -  (omega_1-omega_c)

Which gives obviously (omega_1-omega_2)

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