An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Steiner's theorem
  فربین ِ اشتاینر  
farbin-e Steiner
Fr.: théorème de Steiner  

The → moment of inertia of a body about an arbitrary axis x’ is equal to the sum of its moment of inertia about axis x, passing through the center of mass of the body and parallel to axis x’, and the product of the mass M of the body by the square of the distance d between axes x and x’: Ix’ = Ix + Md2.
Same as → parallel axis theorem.

See also: Named after Jakop Steiner (1796-1863), a Swiss mathematician who derived this statement; → theorem.