Analyzing Belief Re-revision by Consideration of Reliability Change in Legal Case

The connection between belief change and reliability change is an important aspect of agent communication. That is, an agent can change his/her belief when he/she considers that the received information is unreliable. In order to capture both belief change and reliability change, several dynamic operators were proposed in terms of dynamic epistemic logic. Belief change can be handled by commitment and permission. The first operator is used to remove some beliefs, while the second operator is used to restore the former beliefs. For analyzing reliability change, this study introduces a joint downgrade operator to allow an agent to downgrade the agents in a specific group to be equally reliable and less reliable than the other agents. Based on these dynamic operators, this study proposes to analyze an agent´s belief re-revision based on a consideration of reliability change in a legal case from Canada.