
In physics, a pseudoscalar is a quantity that behaves like a scalar, except that it changes sign under a parity inversion such as improper rotations while a true scalar does not. Any scalar product between a pseudovector and an ordinary vector is a pseudoscalar. The prototypical example of a pseudoscalar is the scalar triple product, which can be ...
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http://en.wikipedia.org/wiki/Pseudoscalar

a scalar quantity that changes sign when the sense of the orientation of the coordinate system is changed.
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https://www.infoplease.com/dictionary/pseudoscalar
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