What is an example of a proper rotation in physics?

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A proper rotation in physics is defined by a transformation matrix with a determinant of +1, which ensures that a right-handed coordinate system remains right-handed. This concept is crucial in understanding Lorentz transformations, as outlined in the document from Harvard University. In contrast, a transformation with a determinant of -1 is classified as improper, indicating a transformation that cannot be physically realized, as it would invert the orientation of the coordinate system.

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An example being its use in the beginning of this document:

http://isites.harvard.edu/fs/docs/icb.topic1288789.files/Rotations-Lorentz-Transformations.pdf

I haven't read the whole document yet so forgive me if it explains what it means later on.
 
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'proper' usually means the determinant of the transformation matrix is +1.
 
Meir Achuz comment is correct, as far as it goes. If the determinant is +1, a right-handed coordinate system is transformed into a right-handed coordinate system; this is a "proper" (or physically realizable) transformation.

If the determinant is -1, the transformation is "improper" which is to say that a right-handed system is transformed into a left-handed system, and vice versa. This is improper in that it cannot be realized physically because "it turns space inside out."
 

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