28 citations · 85 across the 17 of their papers we have counts for
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math.RA2008★ 6 cited
The Procesi-Schacher conjecture and Hilbert's 17th problem for algebras with involution
Igor Klep, Thomas Unger
In 1976 Procesi and Schacher developed an Artin-Schreier type theory for central simple algebras with involution and conjectured that in such an algebra a totally positive element…
cs.IT2008★ 28 cited
Quadratic Forms and Space-Time Block Codes from Generalized Quaternion and Biquaternion Algebras
Thomas Unger, Nadya Markin
In the context of space-time block codes (STBCs), the theory of generalized quaternion and biquaternion algebras (i.e., tensor products of two quaternion algebras) over arbitrary b…