Examples, problems, and results in effect algebras

This article discusses various unsolved problems and conjectures that have arisen in the study of effect algebras (orD-posets) during the last few years. We also include some examples, counterexamples, and results that motivate or partially solve these problems. The problems mainly concern sharp and principal elements, the existence of infima in Hilbert space effect algebras, tensor products, and interval algebras.

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