Forms and Baer ordered *-fields |
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Authors: | Ka Hin Leung |
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Institution: | (1) Department of Mathematics, National University of Singapore, 119260, Singapore |
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Abstract: | It is well known that for a quaternion algegra, the anisotropy of its norm form determines if the quaternion algebra is a
division algebra. In case of biquaternio algebra, the anisotropy of the associated Albert form (as defined in LLT]) determines
if the biquaternion algebra is a division ring. In these situations, the norm forms and the Albert forms are quadratic forms
over the center of the quaternion algebras; and they are strongly related to the algebraic structure of the algebras. As it
turns out, there is a natural way to associate a tensor product of quaternion algebras with a form such that when the involution
is orthogonal, the algebra is a Baer ordered *-field iff the associated form is anisotropic. |
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Keywords: | |
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