Bünger, FlorianFlorianBüngerKnüppel, FriederFriederKnüppelNielsen, KlausKlausNielsen2021-02-122021-02-121997-07-15Linear Algebra and Its Applications 1-3 (260): 9-42 (1997-07-15)http://hdl.handle.net/11420/8776Given a regular --hermitian form on a finite-dimensional vector space V over a commutative field K of characteristic ≠ 2 such that the norm on K is surjective onto the fixed field of - (this is true whenever K is finite). Call an element σ of the unitary group a symmetry if σ2 = 1 and the negative space of σ is 1-dimensional. If π is unitary and det π ∈ 1, -1, we prove that π is a product of symmetries (with a few exceptions when K = GF 9 and dim V = 2) and we find the minimal number of factors in such a product.en0024-379519971-3942American Elsevier Publ.InformatikMathematikJournal Article10.1016/s0024-3795(97)80003-1Other