Merkurjev's construction produces degree-6 algebras with orthogonal involutions admitting non-R-trivial proper projective similitudes over fields with anisotropic torsion 3-fold Pfister forms, including transcendental extensions of local/global number fields and real closed fields.
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Non-$R$-trivial proper projective similitudes in type $A_3\equiv D_3$
Merkurjev's construction produces degree-6 algebras with orthogonal involutions admitting non-R-trivial proper projective similitudes over fields with anisotropic torsion 3-fold Pfister forms, including transcendental extensions of local/global number fields and real closed fields.