The discussion centers around a theory on déjà vu presented by a user, which includes complex mathematical elements that some participants find problematic. Critics argue that the theory violates principles of causality and lacks scientific grounding, suggesting that déjà vu is difficult to define and may simply stem from memory issues. Additionally, there is a warning about the forum's rules against personal theories, indicating that such speculative ideas are not permitted in the context of established scientific discourse. Overall, the conversation highlights skepticism regarding the validity of the proposed theory and emphasizes the need for adherence to scientific standards.