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1. Contributions to a noncommutative real algebraic geometry Aljaž Zalar, 2017, doctoral dissertation Keywords: real algebraic geometry, positive polynomials, quadratic module, Positivstellensatz, free positivity, linear operator inequality, spectrahedron, noncommutative polynomials |
2. Matrix versions of Real and Quaternionic Nullstellensätze Jaka Cimprič, 2022, original scientific article Keywords: Real Algebraic Geometry, Nullstellensatz, polynomials over division algebras, matrix rings, quaternions |