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Finiteness of Hermitian Levels of Some AlgebrasKeywords: KeyWords:Quaternion algebra , octonion algebra , level , hermitian level , sums of squares , quadratic forms. Abstract: We characterize the hermitian levels of quaternion and octonion algebrasand of an 8-dimensional algebra D over the ground field F, constructed using a weak version of the Cayley-Dickson double process.It is shown that all values of the hermitian levels of quaternion algebras with the hat-involution also occur as hermitian levels of D. We give some limits to the levels of the algebra D over some ground field.
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