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Involution (mathematics)
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=== Euclidean geometry === A simple example of an involution of the three-dimensional [[Euclidean space]] is [[Reflection (mathematics)|reflection]] through a [[plane (mathematics)|plane]]. Performing a reflection twice brings a point back to its original coordinates. Another involution is [[reflection through the origin]]; not a reflection in the above sense, and so, a distinct example. These transformations are examples of [[affine involution]]s.
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