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Wikipedia definition
1. PseudovectorIn physics and mathematics, a pseudovector (or axial vector) is a quantity that transforms like a vector under a proper rotation, but gains an additional sign flip under an improper rotation such as a reflection. Geometrically it is the opposite, of equal magnitude but in the opposite direction, of its mirror image. This is as opposed to a true or polar vector (more formally, a contravariant vector), which on reflection matches its mirror image.
Read “Pseudovector” on English Wikipedia
Read “擬ベクトル” on Japanese Wikipedia
Read “Pseudovector” on DBpedia

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