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A quantity which has magnitude only, and which acts, under Lorentz transformation, like a scalar but with a sign change under space reflection or time reflection, or both.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a quantity that remains the same under translation and rotation of the coordinate axes but that changes sign under inversion—that is, when the direction of each of the axes is reversed. An example of a pseudoscalar is the triple scalar product of three polar vectors. In general, the scalar product a.b of the pseudovector a and the polar vector b is a pseudoscalar. Other examples of pseudoscalars are the radius of torsion of a space curve and the static moment.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.