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Kleiner, Johannes and Tull, Sean (4. June 2021): The Mathematical Structure of Integrated Information Theory. In: Frontiers in Applied Mathematics and Statistics, Vol. 6, 602973 [PDF, 821kB]


Integrated Information Theory is one of the leading models of consciousness. It aims to describe both the quality and quantity of the conscious experience of a physical system, such as the brain, in a particular state. In this contribution, we propound the mathematical structure of the theory, separating the essentials from auxiliary formal tools. We provide a definition of a generalized IIT which has IIT 3.0 of Tononi et al., as well as the Quantum IIT introduced by Zanardi et al. as special cases. This provides an axiomatic definition of the theory which may serve as the starting point for future formal investigations and as an introduction suitable for researchers with a formal background.

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