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math.RA2026
Order embeddings of real matrix domains
Peter Semrl
Let be a positive integer, , and the set of all real symmetric matrices. A nonempty subset $\U \subset S_n$ is called a matrix domain if it is open…
math.FA2026
Order automorphisms of effect algebras
Peter Semrl
An elegant description of the general form of order automorphisms of effect algebras has been known in the complex case. We present a much simpler proof based on the projective geo…