Abstract Let A be an n × n Hermitian matrix and A = UΛUH be its spectral decomposition, where U is a unitary matrix of order n and Λ is a diagonal matrix. In this note we present the perturbation ...
Abstract We analyze the forcing notion 𝒫 of finite matrices whose rows consist of isomorphic countable elementary submodels of a given structure of the form 𝐻𝜃. We show that forcing with this poset ...
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