Editing Improper rotation (section)

== Physical systems==
When studying the symmetry of a physical system under an improper rotation (e.g., if a system has a mirror symmetry plane), it is important to distinguish between [[vector (geometry)|vector]]s and [[pseudovector]]s (as well as [[scalar (mathematics)|scalars]] and [[pseudoscalar]]s, and in general between [[tensor]]s and [[pseudotensor]]s), since the latter transform differently under proper and improper rotations (in 3 dimensions, pseudovectors are invariant under inversion).