Comment #16 on issue 2807 by moorepa...@gmail.com: Change .unit and .mag to proper methods and better names.
http://code.google.com/p/sympy/issues/detail?id=2807
Gilbert just suggested to me that we go with .norm() for the magnitude of a vector and .versor() for the unit vector :) Versor! It generalizes nomrlize() just as .norm() generalizes magnitude()
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