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Published online by Cambridge University Press: 20 November 2018
Let V be a vector space over an arbitrary field F. In V a bilinear form
is given. If f is symmetric [(x, y) ≡ (y, x)] or skew-symmetric [(x, y) + (y, x) ≡ 0], then
1
Thus right and left orthogonality coincide. It is well known that (1) implies conversely that f is either symmetric or skew-symmetric in V. We wish to give a simple proof of this result.