Geodesic
Symplectic bilinear forms on affine real algebraic surfaces
Glasgow mathematical journal, Tome 31 (1989) no. 2, pp. 195-198

Voir la notice de l'article provenant de la source Cambridge University Press

Given a commutative ring A with identity, let W–1(A) denote the Witt group of skew-symmetric bilinear forms over A (cf. [1] or [7] for the definition of W–1 (A)). 
Kucharz, W. Symplectic bilinear forms on affine real algebraic surfaces. Glasgow mathematical journal, Tome 31 (1989) no. 2, pp. 195-198. doi: 10.1017/S0017089500007746
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