In ethics, individual responsibility is often defined through Frankfurt's principle of alternative possibilities. This definition is not adequate in a group decision-making setting because it often results in the lack of a responsible party or "responsibility gap". One of the existing approaches to address this problem is to consider group responsibility. Another, recently proposed, approach is "higher-order" responsibility. The paper considers the problem of determining whether higher-order responsibility up to a given degree is sufficient to close the responsibility gap and analyses the computational complexity of this problem.

In many real-world situations, there is often not enough information to know that a certain strategy will succeed in achieving the goal, but there is a good reason to believe that it will. The paper introduces the term "doxastic" for such strategies. The main technical contribution is a sound and complete logical system that describes the interplay between doxastic strategy and belief modalities.

The quantum Internet’s significance in information technology is increasingly recognized for its potential to enable secure and private communication. The quantum Internet facilitates the transmission of quantum information over extensive distances, thus unlocking novel possibilities in various applications. In this study we explore the quantum communication capacity within general quantum entangled networks. Leveraging von Neumann entropy, we show the capability of state transfer and information concentration across four-party networks, thereby characterizing the bipartite quantum communication capacity with the support of local operations and classical communications from other parties. We introduce unidirectional and bidirectional models, employing chain or star transferring network configurations, and extend these frameworks to encompass general quantum networks. Furthermore, we provide illustrative examples to underscore the implications of our findings. This research yields the initial nontrivial outcome concerning quantum communication capacity across general quantum networks, shedding light on the potential of quantum networks for advanced communication protocols.

The article proposes a new approach to reasoning about knowledge and strategies in multiagent systems. It emphasizes data, not agents, as the source of strategic knowledge. The approach brings together Armstrong's functional dependency expression from database theory, a data-informed knowledge modality based on a recent work by Baltag and van Benthem, and a newly proposed data-informed strategy modality. The main technical result is a sound and complete logical system that describes the interplay between these three logical operators.

The paper studies preferences of agents about other agents in a social network. It proposes a logical system that captures the properties of such preferences, called "likes". The system can express nested constructions "agent likes humbled people", "agent likes those who like humbled people", etc. The main technical results are a model checking algorithm and a sound, complete, and decidable axiomatization of the proposed system.

The paper proposes a data-centred approach to reasoning about the interplay between trust and beliefs. At its core, is the modality "under the assumption that one dataset is trustworthy, another dataset informs a belief in a statement". The main technical result is a sound and complete logical system capturing the properties of this modality.

The article proposes a new approach to reasoning about knowledge and strategies in multiagent systems. It emphasizes data, not agents, as the source of strategic knowledge. The approach brings together Armstrong's functional dependency from database theory, a data-informed knowledge modality based on a recent work by Baltag and van Benthem, and a newly proposed data-informed strategy modality. The main technical result is a sound and complete logical system that describes the interplay between these three logical operators.