We characterise aspects of the reasoning of an agent who trusts the reliability of the information communicated to him by some other agent. Tools drawn from applied modal logic are used to formulate the characterisation. Based on our analysis of trust, we offer a definition of a notion of deception. We indicate that, in our account, the trust relation is not transitive, but we also show how to represent the situation in which one agent is prepared to trust what some other agent trusts
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